Mercedes Voltage Regulator Symptoms

Alternator/generator/regulator Problems of Mercedes Benz C230 Mercedes Benz C230 owners have reported 5 problems related to alternator/generator/regulator (under the electrical system category). If you suspect your final stage is failing, look for the following symptoms: If your blower motor fails, replace the blower and resistor toge Mercedes Voltage. Fuel injector cleaning and flow testing service at Injector RX is cost effective and comes with guaranteed results. With computer controlled EFI, the computer or any of its sensors or actuators can go faulty, and when this happens you can get, you guessed it- incorrect ignition and incorrect fuel/ air mixture for the required operating condition, thus engine stumble. Includes model range, engines, transmissions, safety equipment, crash testing, features and updates. There are some sure ways you can tell if your battery is bad by simply taking a good look. Don't try adding a resistor or whatever. Year and miles for this Mercedes Benz? Voltage regulators are built into the alternators on modern vehicles. Get Best Used Parts Online For Buick Lucerne Voltage Regulator At Affordable Prices From QualityAutoParts. Any reading over 15. Calls to the toll-free Roadside Assistance number: 1-800-FOR-MERCedes (in the USA) 1-800-387-0100 (in Canada) will be answered by Mercedes-Benz Client Assistance Representatives 24 hours a day, 365 days a year. With so many electronic components, things go wrong and could end up draining one of the batteries. Read below where Experts have answered a few questions and problems concerning the Volvo voltage regulator. In some cases, this code can be quite tricky to detect, so they observe these things while changing the engine load, throttle position, RPM, and the road speed. However, since you also noted that the ground wire is not firmly connected (corroded), that, too, could cause the problem (by creating a ground loop, which raises the potential of the battery's ground). On most modern bikes there is a combined rectifier/regulator (reg/rect). P0621 MERCEDES-BENZ Possible Symptoms. secondly the transmission system does not respond sharply,some kind of delay in responding. But if the battery reads over 15 volts or less than 13 volts, then there might be a problem with the voltage regulator, the wiring or the alternator. Having higher amp rating alternator can also cause the battery to charge faster for shorter ammount of time causing higher voltage reading. Theses engines were more powerful and more fuel efficient. I think it's very probably the voltage regulator in the alternator. 2v to prevent cooking the battery. We're here to help you find that perfect Voltage Regulator for your Mercedes Benz E320. We love when auto parts experts come to our site and we love when car parts newbies come to our site. Includes model range, engines, transmissions, safety equipment, crash testing, features and updates. This causes the voltage regulator to begin controlling the generator field circuit. If the voltage is less than 13. 6V with engine off and 14. Arguably the most important instrument in your day-to-day activities is your car. I have a 67 Satalite with a 1972 480 horse 360. Your Mercedes: nice 201 2. An older car may have a dynamo instead of an alternator. Hello, What are the symptoms of a bad fuel pressure regulator? My car, 92 W201 2. It would appear that this part isn't actually listed anywhere as a separate item, although I did manage to track one down on e-bay. Voltage Fault DME; 299B DME Intelligent. You access these usually by shorting 2 terminals on a diagnostic connector which is sometimes inside the car, sometimes under. If you have a volt/amp gauge, it will read the alternator output for you. Alternators have a voltage regulator on/in them. Ford Voltage Regulator Problems A voltage regulator is a mechanical device that is used to control the level of voltage in an alternator of a vehicle. System Voltage High. Symptoms - Engine Light ON (or Service Engine Soon Warning Light) P0091 Mercedes-Benz Fuel Pressure Regulator Solenoid 1 Control Circit Low Voltage. Doug DeMuro Claims Mercedes 500E Started the AMG Craze YouTube favorite thinks the Porsche-built 500E was a solid effort that fell short of the AMG-infused greatness of its successors. The converted electricity then goes to the voltage regulator. Your alternator has a bad voltage regulator. If you suspect your final stage is failing, look for the following symptoms: If your blower motor fails, replace the blower and resistor toge Mercedes Voltage. 12 volts is the short common slang for nominal battery voltage. Probably the first thing you'll notice is the oil pressure gauge or the warning light reading very low or coming on when the car is fully warmed and idling like at a traffic light. I noticed the slip rings were worn (like 1/8th inch groove) so that when the alternator started to act up a year later and I got a rebuilt. The voltage regulator, IIRC, has four connections that have to be good. Year and miles for this Mercedes Benz? Voltage regulators are built into the alternators on modern vehicles. A number of symptoms can develop if the voltage regulator fails to deliver sufficient voltage. If the voltage is 13. Forward two years and the junkie voltage regulator they put in dies again. com as Symptoms of a Bad or Failing Fuel Pressure Regulator. The battery supplies the car with power when the car is not running. I thought I had a skinned wire grounding out, or maybe a sticking thermostat, or a slipping belt. The voltage regulator fits into the rear of the alternator and over time will wear to the point the alternator will not charge the battery. This is the wire for the charging light and is also used to help 'excite' the alternator into charging when you start your car. If the voltage is less your mixture is a too lean for max power, if it's the voltage is too high your mixture is too rich. The battery stores electricity for the car and the alternator recharges the battery. PCP SHOT Recommended for you. I have 5 cyl. The bearings on which the alternator rotates can also be at fault and hinder the alternator from providing an optimal performance. Once the engine is. Don't try adding a resistor or whatever. With computer controlled EFI, the computer or any of its sensors or actuators can go faulty, and when this happens you can get, you guessed it- incorrect ignition and incorrect fuel/ air mixture for the required operating condition, thus engine stumble. See video below for voltage regulator replacement. Alternators have a voltage regulator on/in them. Following the Automotive Fuel Injector Testing Procedure. NONE! Yes, you read that correctly, none that I noticed. You may notice. 8i X5 35dX: Voltage Regulators - Amazon. EGR Valve or Low battery Discussion in ' failed voltage regulator, faulty alternator, drain current. Mercedes-Benz E-Class and E-Class AMG: Why is There a Red Battery Message Saying Visit Workshop? No need to panic when a red message saying "Visit Workshop" appears in the car cluster. The Mercedes has a series of sensors that, working in concert with a computer, maintain a constant climate in response to the settings on the console. The alternator is a key component in your car's electrical system, turning the energy from the crankshaft into useful electricity to power your vehicle's. When engine fairly cold, upon cranking the engine, the rpm needle will bounce from 0 - 4500rpm and engine will develop a "choke like" sound and then it will fire up. However, approximately 3 months later, I am once again experiencing the same problem. Radio won't power up, of. If one of the contact switches has stuck, it can produce an overcharge rate, typically 15 volts or more. When the car is running, the voltage must read in the range of 13 to 14. There are some sure ways you can tell if your battery is bad by simply taking a good look. • Charge Voltage: A voltage value obtained when the charging system is operating. One of the first symptoms of an issue with the voltage regulator is dim or flickering gauges. AutoZone offers Free In-store Pickup for Mercedes Benz Voltage Regulator. You can hardly diagnose a MAF sensor on symptoms alone. The light only indicates a charging problem. It should read close to 12. Labor costs are estimated between $158 and $200 while parts are priced at $110. If the voltage is greater than 14. This Over Protection Relay or OVP is for a Mercedes-Benz SL R 107 chassis but will be suitable for other period Mercedes-Benz cars. The most recently reported issues are listed below. Membership is extended to non-owners with a genuine interest in the best engineered car in the world. Often, these regulators may fail to function properly causing a car to experience several types of problems related to it. If the fuel pressure regulator is failing at the vacuum port, as your partner revs the engine you'll actually see fuel seeping or spraying into the vacuum line. Has anyone used them. Mercedes-Benz E-Class and E-Class AMG: Why is There a Red Battery Message Saying Visit Workshop? No need to panic when a red message saying "Visit Workshop" appears in the car cluster. Th "ignition" light comes on when battery voltage exceeds alternator voltage, or vice-versa. DIAGNOSING PROBLEMS RELATED TO THE COOLANT TEMPERATURE SENSOR by Mark Davidson. I fixed that (electrical tape). 5 volts low because of lack of accuracy, so the alternator could be over charging and you will need either new voltage regulator or worse a new alternator. It would appear that this part isn't actually listed anywhere as a separate item, although I did manage to track one down on e-bay. So, my thought was it must be the voltage regulator. Start the car and check the battery voltage after a couple minutes. This part constantly changes the voltage so that it fills the gap when the battery produces a lower voltage. But if the battery reads over 15 volts or less than 13 volts, then there might be a problem with the voltage regulator, the wiring or the alternator. Probably the most common make is Bosch. This sensor is usually located near the middle of the fuel rail and is linked to the engine control unit (ECU), which is the central computer of a vehicle. Voltage regulators are commonly found in vehicles and other electronic equipment. Following the Automotive Fuel Injector Testing Procedure. NONE! Yes, you read that correctly, none that I noticed. CONS of Iridium Spark Plugs. When we first crank up the engine, battery voltage will be at about 12. When the car is running the alternator produces electricity and the voltage should be above 13. The dealership. I recently installed a new voltage regulator on my 2001 E320 sedan - gasoline powered with 90K miles. Replaced the regulator and it worked. Some older vehicles have external voltage regulators, whereas many late-model vehicles use the PCM to control charging output. (Page 1 of 2) CarComplaints. If the part fails too often, the alternator may need repair or even replacement. Engine Related Pictorials. com : Car complaints, car problems and defect information. 8is 545i 645Ci 650i 650i 645Ci 650i 650i X5 4. They all say it is probably related to the voltage regulator or computer system. NONE! Yes, you read that correctly, none that I noticed. The test light works well enough. Year and miles for this Mercedes Benz? Voltage regulators are built into the alternators on modern vehicles. If your battery appears to be leaking, then your voltage regulator has probably failed. If you have a volt/amp gauge, it will read the alternator output for you. Do these symptoms sound like a weak alternator, or failing voltage regulator?. 5 with 78,000 original miles. Watch Out! Here are the Symptoms of a Bad Throttle Position Sensor. All alternators have housings made from aluminum because it is a non-magnetic metal. 2v to prevent cooking the battery. BOSCH Electrical : Voltage Regulator Auto Parts ALL THE PARTS YOUR CAR WILL EVER NEED Show Prices In US Dollars ($) Australian Dollars (AU$) Brazilian Real (R$) Canadian Dollars (CAD$) Swiss Francs (CHF) Euros (€) British Pounds (£) Japanese Yen (¥) Mexican Pesos (Mex$) Norwegian Krone (kr). 00 on average. The voltage regulator is located on the rear of the alternator. This was all on a 2000 Mercedes, the motor was not the problem. Other parts of the charging system include your battery, voltage regulator and wires. As these old Mercedes approach 20+ years the brushes are wearing out and the alternators are failing. When I start the car, I have 11. Labor costs are estimated between $349 and $441 while parts are priced at $127. Mercedes Fault codes can be a pain especially the body and chassis control codes. The regulator should keep the voltage at less than 14. Replace relay and Test the fuel pump connector at the back of the car and test for incoming voltage using a digital multimeter. For 2005 model year, light duty full size pickups and utilities, are equipped with a new regulated voltage control (rvc) system, covered in the September 2004 techlink. Lead-acid cells are 2. Follow this guide on how to scan BMW codes. If this is normal reading and higher than at the battery itself then it could be as simple as a corroded earth lead, check the one from the battery to chassis first and work your way through. A faulty voltage regulator can also cause charging problems. The alternator was replaced in 2005 and the above company told me that it had to be replaced again. I was able to restart the car and drive it fine. Buy BMW OEM Engine Electrical Alternator Generator Voltage Regulator X5 4. Your regulator is probably unable to produce enough DC voltage at lower engine RPMs. The regulator is what holds the voltage output at a steady (suitable) level. P0622 Mercedes-benz Description The Engine Control Module (ECM) uses the generator turn on signal circuit to control the generator. Undercharging or overcharging the battery are symptoms of a faulty voltage regulator. 5minutes after leaving the garage, the stop and brake defective light appeared along with the beep. Buy for Mercedes (98-08) Voltage Regulator for BOSCH Alternator only: Alternators - Amazon. Forward two years and the junkie voltage regulator they put in dies again. Replacing alternator voltage regulator. If the fault detection circuit senses a voltage other than what is expected, this DTC will set. If the voltages are both high (accessories off and on), the alternator may be bad. FP Regulators are fitted to high pressure pumps and or to the common fuel rail in modern common rail diesel cars. I was able to restart the car and drive it fine. Is there a plug that I can order for the new voltage regulator and splice into the harness or do I have to order another regulator. Will not chrage - Mercedes-Benz 420-Series question. Other symptoms of a bad oxygen sensor include a rough idle, a misfire, and/ or hesitation when trying to accelerate. Don't forget the ground wire on the voltage regulator! Check the voltage at the Bat terminal on the alternator. Battery voltage should be 12. Which gets me to where I am now. Both of these are pristine examples of very desirable models. Engine Related Pictorials. A faulty voltage regulator can also cause charging problems. Check the wiring diagram for your model year and locate the sense line to the logic module. Return style systems will bleed excess fuel back to the tank through the regulator. Nevertheless, you should definitely clean those connectors and terminals every now and then. The noise is most noticeable when coasting or decelerating. • Charge Voltage: A voltage value obtained when the charging system is operating. Voltage Regulator may be defective and needs replacement. A faulty voltage regulator can also cause charging problems. Many owners are having their expensive alternators replaced without knowing that it might just be the inexpensive voltage regulator mounted on the back on the alternator. Shop with us to enjoy even more savings with our discount deals and offers. Membership is extended to non-owners with a genuine interest in the best engineered car in the world. If this does happen, it will cause horrendous noise from the front of the vehicle. Most of the time failed alternator can be fixed by replacing cheap voltage regulator (i. If you suspect your voltage regulator, perform these simple tests with your. Alternator/generator/regulator Problems of Mercedes Benz C230 Mercedes Benz C230 owners have reported 5 problems related to alternator/generator/regulator (under the electrical system category). When the car is running the alternator produces electricity and the voltage should be above 13. The voltage should be well over 13 volts if the battery isn't fully charged, depending on the car. One of the first symptoms of an issue with the voltage regulator is dim or This article originally appeared on YourMechanic. Average failure mileage is 40,900 miles. 3) Less Voltage Needed. However, pinpointing the cause of problems like a dead battery, battery overcharge or malfunction-indicator lamp warning may be difficult. The car was jumped and the vehicle was brought in for service. We love when auto parts experts come to our site and we love when car parts newbies come to our site. I had the same symptoms, replaced the regulator and the problem went away. When I manualy power #2 terminal the Idle speed drops to normal(750rpm). Troubleshooting Guide for Hard Starting Problems. Diagnose Made Easy Don’t know what’s wrong with your car? Then use AutoMD’s intuitive "question tree" car diagnostic feature. Mercedes-Benz E-Class: How to Replace Alternator. Contributed By: Enginebasics. 5V or more with the engine running, there is a connection problem downstream. On most modern bikes there is a combined rectifier/regulator (reg/rect). Mercedes-Benz Owners (MBO) Forum, exists for the benefit of owners of Mercedes-Benz cars. 5, XL-5, XL-10, EVX-2, VXL-3s, and VXL-3m. Usually a faulty instrument voltage regulator will produce a few symptoms that can alert the driver of a potential issue. NONE! Yes, you read that correctly, none that I noticed. Had intended to have the alternator/voltage regulator checked at the next opportunity as I've still got a bad feeling the problem may lie therein! Having replaced the fried battery (as per my previous post), I took the Vito for a short mileage trip yesterday, only to find the rank fumes returning once more. If the regulator detects a problem, the regulator will ground the generator turn on signal circuit, pulling the voltage low. 9 no cause for overcharge alert. If you have a multimeter like this one, you can connect it to the battery terminals to get a voltage reading. In most cars, the purge valve is normally closed, meaning it should be closed with no voltage and open when the voltage is applied. Advance Auto Parts has 1 different Voltage Regulator for your vehicle, ready for shipping or in-store pick up. Your alternator is the issue, since the voltage regulator is internal to the alternator. • Charge Voltage: A voltage value obtained when the charging system is operating. P0620 MERCEDES-BENZ Possible Symptoms. 9/18/15 i have 240D MB - Alternator started to die, replace Voltage Regulator with Cheap Chinese, failed in days, Lights were dimming while driving in night. BOSCH BOSCH Regulator, alternator SP15986. According to RepairPal, an info site for drivers, symptoms of this malfunction are an illuminated check engine light, improperly shifting gears and decreased fuel economy. Forward two years and the junkie voltage regulator they put in dies again. All grounds have been checked and cleaned to verify proper grounding. 5V, remove the plug connector at the voltage regulator. 00 on average. Is a 1991 Mercedes 420 SEL equipped with a voltage regulatorReplaced the alternator and battery. 8 there is likely a problem with the voltage regulator. Replace relay and Test the fuel pump connector at the back of the car and test for incoming voltage using a digital multimeter. This blowback means there isn't a good vacuum signal to work with at the fuel pressure regulator anymore, and the regulator will need to be replaced. If the fault detection circuit senses a voltage other than what is expected, this P0620 Mercedes-Benz code will set. They did have a few teething problems but have proven to be very durable as long. Follow this guide on how to scan BMW codes. The only exception is the pair replacement of the alternator and voltage regulator (above) if you know that one is bad. Membership is extended to non-owners with a genuine interest in the best engineered car in the world. I noticed the slip rings were worn (like 1/8th inch groove) so that when the alternator started to act up a year later and I got a rebuilt. Check the voltage sense line to the logic module. E320 V6 CDI Bucking again! Voltage is too high. I checked with Bob again, but he did not have any voltage regulators in stock. This is the wire for the charging light and is also used to help 'excite' the alternator into charging when you start your car. It is responsible for supplying the engine with fuel for combustion. Radio won't power up, of. Check for any leakage if you have older lead acid battery. I have replaced both the battery and alternator because of Jeep to not starting in the morning. You will pay about $300-$450 for parts (fuel pump) at the dealer. Mercedes-Benz E-Class: How to Replace Alternator. Check out our catalog now!. Later, the alternator was declared dead, even with new voltage regulator purchased from Mercedes Source. I fixed that (electrical tape). Will not chrage - Mercedes-Benz 420-Series question. I'll add another opinion, having recently had the identical symptoms on my Europa TC. Buy Mercedes-Benz C-Class Voltage Regulators and get the best deals at the lowest prices on eBay! Great Savings Free Delivery / Collection on many items Mercedes-Benz C-Class Voltage Regulators for sale | eBay. You can hardly diagnose a MAF sensor on symptoms alone. Alternators have a voltage regulator on/in them. If this voltage isn't present, the problem could be anything from the ground, to the state of the battery connectors, to the alternator, voltage regulator, or computer. Mercedes-Benz E320 Instrument Voltage Regulator Replacement costs between $220 and $237 on average. Of course, the 280SL (Happier) in the foreground has been around for a while, but check out the Mercedes on the lift and the one directly behind it. Run engine at 2,000 rpms for tests and turn on the blower fan for the AC or Heater, the headlamps, and any other accessories that put a strain on the alternator, and watch the gauge to see if it decreases voltage or amperage. With so many electronic components, things go wrong and could end up draining one of the batteries. Noises Problem 2007 Mercedes Benz C230 6 Cyl Automatic. The above symptoms of a bad intake air temperature (IAT) sensor are not a foolproof way of determining the problem, because they are common for a few other malfunctioning components as well, such as mass air flow sensor, oxygen sensors, coolant temperature sensor, etc. Voltage regulators are commonly found in vehicles and other electronic equipment. Diagnose the problem here. Contributed By: Enginebasics. A voltage regulator maintains an even flow of electrical power to an automobile's electrical systems, including the headlights, dashboard components and the stereo. The contact owns a 2006 Chevrolet Trailblazer. When the car is running the alternator produces electricity and the voltage should be above 13. Free Electricity Generator 220V CFL Energy Light Bulb NEW AC Electric Generator 2019 New Experiment - Duration: 10:16. However there were some new components added to the 1984 California model, and all 1985 models, of the W123 that needed protection from over-voltage as well. These programming steps are the same for the XL-2. To replace the fuel pump on a Mercedes-Benz, it costs between $450 and $800 depending on the MB model. The parts and labor required for this service are. A fuel rail pressure sensor (commonly known as a fuel pressure sensor) is used in many diesel and some gasoline engines. BOSCH Electrical : Voltage Regulator Auto Parts ALL THE PARTS YOUR CAR WILL EVER NEED Show Prices In US Dollars ($) Australian Dollars (AU$) Brazilian Real (R$) Canadian Dollars (CAD$) Swiss Francs (CHF) Euros (€) British Pounds (£) Japanese Yen (¥) Mexican Pesos (Mex$) Norwegian Krone (kr). Abstract: Exhaust gas recirculation (EGR) is an effective strategy to control NOx emissions from diesel engines. According to RepairPal, an info site for drivers, symptoms of this malfunction are an illuminated check engine light, improperly shifting gears and decreased fuel economy. How to replace your timing chain on the 617 engine. We love when auto parts experts come to our site and we love when car parts newbies come to our site. This code is similar to P0090. FP Regulators are fitted to high pressure pumps and or to the common fuel rail in modern common rail diesel cars. I noticed the slip rings were worn (like 1/8th inch groove) so that when the alternator started to act up a year later and I got a rebuilt. Check the wiring diagram for your model year and locate the sense line to the logic module. Alternator/generator/regulator Problems of Mercedes Benz C230 Mercedes Benz C230 owners have reported 5 problems related to alternator/generator/regulator (under the electrical system category). There are some sure ways you can tell if your battery is bad by simply taking a good look. If you don't have an automotive scanner you'll have to lower the tank and pull the connector off the pressure sensor and test it with a voltmeter. Typically you get BATTERY/ALTERNATOR VISIT WORKSHOP warning when the electrical system voltage in the car is below 12. It really is not 12 volts. Mercedes Diesel Glow Plug Repair/Upgrade for Loop Style Plugs. Polarizing a generator? I had never heard of this!. P0563 MERCEDES-BENZ Tech Notes Higher than expected voltage problems are most likely caused by bad voltage regulator. Mercedes Diesel Valve Adjustment Procedure. A typical 12 volt automotive system, engine running at idle, all accessories turned off, should read 14. What is this new type of "performance part"? I have read some auctions and sales pages listing a "Performance Module" which is nothing more than a voltage regulator/stabilizer for car voltages, as many people have asked me if it is worth it. Don't try adding a resistor or whatever. If the voltages are more than what's specified, then the regulator is probably shot and needs to be replaced. In March 2004, a recall was issued for Mercedes-Benz W211 E-Class sedans fitted with a split and folding rear seat and manufactured between August 2003 and October 2003 due to the possibility that the tongue of the seat belt may not belt may not fully engage in the seatbelt buckle (PRA 2004/6890). The Mercedes-Benz Roadside Assistance Program provides factory trained technical help in the event of a breakdown. PeachParts Mercedes-Benz Forum OVP vs FPR ( signs and symptoms) w124 300E fuel pump relay and klima relay as well as a voltage regulator in a pouch in the. Here I am checking to make sure the coil has power. I parked for about 30 minutes and when I started the car again, I got an "Auxiliary Battery. I'll do my best though. To be honest, it is not because MB cars are weak in this area, but because most owners forget that spark plugs are wear items and need to be replaced at the recommended intervals. The role of the Mercedes alternator is to charge the battery with 14 volts. Then, I was starting to think I may have a voltage regulator problem. I checked, sprayed down with cleaner and tightened the grounds off of the battery. Experience in a Book Electronic Fuel Injection. Fuel injector cleaning and flow testing service at Injector RX is cost effective and comes with guaranteed results. The voltage regulator, IIRC, has four connections that have to be good. Shop with us to enjoy even more savings with our discount deals and offers. Note - we removed the alternator for better pictures but you do not need to remove it to perform this work. Internally regulated alternators have a small solid state module that controls charging output. MERCEDES BENZ CLASS S IV 220 s600 2001 ignition coil so i took my benz to a mb dealership shop told me it would take 2-3 hours to get to the ignition coil. DIAGNOSIS AND TESTING - BOOST PRESSURE SENSOR. 6 volts when the car is off. And the engine won't start the next time you try. We service fuel injectors for the automotive, motorcycle, marine and other industries at a fraction of the cost of new or even refurbished fuel injectors. Replaced the regulator and it worked. A voltmeter would be a little better, we should see voltage about equal to battery voltage. Did you try checking the voltage at the battery terminals/alternator while revving the engine? I had a similar problem, did this and found that the volts output by the alternator went up to 18v (at around 3000rpm on a Diesel where redline was 4000rpm). Voltage Regulator. Mercedes Combination Switch Replacement. P0620 MERCEDES-BENZ Possible Symptoms. Following the Automotive Fuel Injector Testing Procedure. Here are some tips that can help you along the way. Click to Get Book Here By Mandy Concepcion. No middle man fees. Labor costs are estimated between $145 and $184 while parts are priced at $148. This is probably why they're suggesting replacement of the alternator, but I don't see any reason to replace the battery if it tested OK. If one of the contact switches has stuck, it can produce an overcharge rate, typically 15 volts or more. I can build engines but I'm a wiring idiot. You may notice the voltage fluctuates a lot at low RPM but at full throttle above 2500 it should be steady, if not check your voltmeter connection and if it's good get a new O2 sensor. The only exception is the pair replacement of the alternator and voltage regulator (above) if you know that one is bad. Shop with us to enjoy even more savings with our discount deals and offers. also when i pull my car into a parking spot, the engine sounds like it wants to stall. Then turn on the engine again and check the battery. These programming steps are the same for the XL-2. Is there a plug that I can order for the new voltage regulator and splice into the harness or do I have to order another regulator. Most basic automotive systems can be pinpoint tested down to a faulty component in a matter of less than 20 minutes, regardless of the code. Useful Links. They all say it is probably related to the voltage regulator or computer system. I think it's very probably the voltage regulator in the alternator. This code is similar to P0090. Troubleshooting Guide for Hard Starting Problems. It's been a long time since I saw a car with a separate voltage regulator. That is why you can sit and listen to the radio with the engine turned off. I have 5 cyl. P0560 and P0600 on Mercedes benz A190 I have Mercedes benz A190,sometimes when I off the ignition and attempt to restart it doesn't come and after like about an hour it always come up on restart. Get the best deals on Voltage Regulators for Mercedes-Benz E320 when you shop the largest online ALTERNATOR VOLTAGE REGULATOR MERCEDES 300SE 300SL 400E 400SEL. But if the battery reads over 15 volts or less than 13 volts, then there might be a problem with the voltage regulator, the wiring or the alternator.