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what can cause a pcm to go bad

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Troubleshooting is pointing towards the PCM (powertrain control module) 1 reply Report. A bad or failing ECM may produce any of the following 5 symptoms to alert the driver of a potential problem. Moreover, sometimes you will lose power altogether if the drive belt snaps in half. On older engines where the injectors are all fired simultaneously, the good injectors can often compensate for one or two bad injectors. The vehicle misfires on … It may even go into a "limp-in" mode and remain frozen in second or third gear. Mechanic said that the PCM in the car was fried and that it was caused by bad coils that there was a short in the coils and also a bad injector they replace the computer and one of the coils I drove it 3 miles and they said that they computer fried again and had to replace it again . What happens when your stock unit is not capable of powering the demands is the voltage starts to drop as the alternator is attempting to operate above maximum capacity. After all, an experienced and knowledgeable person can handle it way better than we can. So my question is can the PCM cause the alternator to go bad or did I just get another bad alternator or is there some other problem? SPONSORED LINKS. Since the ignition switch provides power to both accessories like your radio and your vehicle’s ignition system, a bad switch can definitely cause both to suddenly stop working. Limp mode is a security function. But this brain thing just happened and it had been installed over a year as well. It can also make your car sluggish, or give you trouble when going up hills or suddenly accelerating. Burning Smell. Basically, two main reasons are account for a bad PCM and knowing them may help to reduce the risk of the same problem from happening again. Also, cracked, brittle, torn belt and contaminated belt due to oil or power steering fluid can decrease power. A bad PCM, or power train control module, has a check engine light that does not turn off, an assortment of random codes, intermediate stalling issues and poor engine performance. If you are not staring at … Answer. This can be caused by several different PCM errors, but may also be an indication of something wrong in your ECM. The car in limp mode can go up to about 45, after that it starts to go past 5 - RPM. Replacing the torque converter can be an expensive endeavor, because the transmission must be removed from the vehicle to get to the torque converter. Can the PCM on my 2013 Dodge RAM 1500 cause the PDC to go bad? Can a chip in your key cause your car battery to go bad and drain it of power? July 06, 2010. Yes. Can a bad ground (remote negative cable post) cause the PCM (computer) to shutdown and also shutoff all car electrical - Answered by a verified Auto Mechanic. I have a saturn sl2 00 that threw out white smoke before, you would assume there was a gasket leak but the mechanic ended up replacing spark plugs, wires and cap and it went away. Sometimes a slipping belt can cause a decrease in power, or a bad drive belt tensioner can also cause a belt to slip. If you have a bad car battery, it can make your car’s engine computer (ECU) act a little bit nutty. Excessive heat can cause it to go bad. 1. Don't know how much you wanna say to the dealer cause some don't take well to mods. Also there is a joint in the wiring from the sensor to the PCM. I'd just be wary that's a possibility. Make sure that you go to a workshop or try to fix it yourself as soon as possible. The PCM is one of potentially several on-board computers, or essentially the "brain" of the engine control system. But if you have a newer battery and you’re still having these electrical problems, then it’s likely the alternator that is at fault. This may cause the transmission to shift roughly or more quickly than normal. Your car’s … It eventually shut itself off after running for over 20 mins. So, yes I do think a new alternator full fielding to get a bad battery up to spec could have caused your PCM to fail. My car has an automatic transmission. The power train control module and engine control module are sometimes confused for one another. Below are five common causes for an alternator to go bad. dandd on . Given the fact you have power at the DLC you can rule out the battery, the cables, and the mega fuse to the junction block. The engine control module monitors the sensors … Unless the PCM is completely fried, someone with a compatible can tool can hook it up and check the PCM. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. The battery is not causing any of these problems. I know that's different! Can a PCM cause the air conditioning system clutch not to engage? bad pcm, bad thermostat, bad starter, all sorts of problems it could be. What causes Code P1693? Look at the coil, injectors, fuel pump & filter and all the vital sensors. These sensors fail at a much higher rate than any of the computers do. My car has 121000 miles. Do you. A faulty computer may cause the vehicle to intermittently have issues such as stalling or misfires. I think they need to make a compromise with you. You can buy an obd2 scanner to check the cause of the limp mode yourself at home. A bad lock-up solenoid or debris in the valve body. I got a pcm ordered it worked for 30 min then went bad. This could happen while speeding up on the highway on-ramp or cruising down a city street. What can cause a pcm on a 06 dodge charger to go bad. We use cookies to give you the best possible experience on our website. 5. The power train control module monitors the drive train system. Bad Performance or Fuel Economy. It’s not good to drive around with limp mode. July 06, 2010. The primary inputs to the PCM come from many sensors, of different types, that are spread around the car. Putting back in a bad battery will eventually cause the alternator to go out again. The AC clutch only engages when a relay in the fuse box is jumped across. However, if the shudder is caused by a bad solenoid or even a bad sensor, the problem can be solved by replacing the bad component. Proper installation is critical. What causes a knock sensor to go bad is right here for you. Why does the computer go bad, let me see, how long does a normal Desktop computer last? Asked by lovey129 in Columbia, SC on . These issues can create dangerous situations causing accidents and injury. A bad MAF sensor can cause your vehicle to experience poor drivability issues such as engine stalling, jerking or hesitation during acceleration. Faulty car battery can affect your engine computer. The fix is to simply replace the bad switch, which is usually pretty easy once you’ve done the work of gaining access to it in the first place. When people experience electrical issues with their vehicle, they’re quick to think it’s the battery’s fault. It may not shift smoothly. September 29, 2016 . No. The voltage in a HO Alternator is regulated exactly the same as the stock unit, keeping ECU and electronics safe. Several things can kill a computer, #1 HEAT, #2 Shoddy Design, #3 Poor Regulation on Alternator, #4 Bad Connections, #5 Excessive Moisture, #6 Excessive Vibration, #7 AGE. 1999 Dodge Intrepid. came back few weeks later and was taken to another mechanic who said it had a pcm and everything else seemed to "work fine". Another symptom of a bad or failing ECU is erratic engine behavior. Limp mode is caused by an electrical problem with the engine or transmission. You need to diagnose your problem by checking all possibilities first, than if it points to the PCM you can swap it with a junk yard PCM and if the problem goes away than you can use that one or get a new one. Micro-cracks in the circuit boards caused by vibrations and thermal stress can usually be repaired quite easily by a PCM re-manufacturer. When they go bad most likely it's just a few circuits that fry, and it may still spit out codes to tell you what's going on. 2013 Dodge Durango. That is fair in my book. Since the ECM controls your air to fuel ratio and transmission, a faulty unit can cause your gas mileage to drop through the floor. MIKE91B wrote:Swapping modules won't help you and will most likely cause you more troubles you don't want.Fuse 14 in the under hood junction block should be the TCM, it is a 15 amp fuse, make sure it is hot. Most of them are oriented toward engine management and performance. A faulty electrical system in a car can play some very tricky games, and your car’s battery is part of that system. Asked by jbboeing in Lumberton, NJ on . The first is environmental issues, thermal stress, corrosion, or vibration can all cause a PCM to die. have the same problem? And they said it couldn’t just be refurbished but had to be a brand new one that is reprogrammed too. I hope that this helps. It is not very often that the PCM is bad. Can a bad pcm cause exhaust to throw white smoke? Besides, to ensure that whenever any of these symptoms occur, you are taking it to the mechanic right away. Check Engine Light Turns On. It may shift at the wrong rpm. That's it - Answered by a verified Dodge Mechanic When the ECM has any issues, it can cause all sorts of problems with the vehicle, and in some cases even render it undrivable. It was P0882 not P0822.Mechanic said it read TCM Power input low, and recommend replace PCM (not sensing power from fuse block). If your car starts the battery is good, it has no role after that unless the alternator is bad but if the alternator was bad the battery would be dead. You pay for the battery and the cables and they should replace your PCM. Common Causes of Alternator Failure. what are the symptoms, without them, you can be helped. ON 09/22/2016 my 2013 Dodge RAM (the Model would not give me a truck option on this web site) 1500 Longhorn Laramie 4x4 (45,000 miles) would NOT SHUT OFF! Now you must keep a constant check on the vehicle. If the transmission computer receives bad information from the transmissions own internal sensors or bad inputs from the PCM or other engine sensors, it will have an adverse effect on how the transmission operates. What can cause damage is too low voltage. Wednesday, July 11th, 2012 AT 2:39 PM. 3 Replies. Grounds, bad grounds to the ECU, Alternator or the Motor can cause all sorts of crazy things and can cause big changes in voltages. Popular Answer. One bad injector will cause a noticeable misfire and usually set a P030X misfire code (where X represents the cylinder that is misfiring). An illuminated Check Engine Light is one possible symptom of a problem with the ECM. If your issue is just a no-start, then it's very likely that your PCM is fine. It was weird as hell. Then when the PCM went bad, not related, I had to get it completely rewired and reprogrammed cause it lost all that with the PCM change. To intermittently have issues such as stalling or misfires the engine control module ) 1 reply Report that! The injectors are all fired simultaneously, the good injectors can often compensate for one or two bad injectors they! How long does a normal Desktop computer last causes for an alternator to go out.... Wan na say to the PCM on my 2013 dodge RAM 1500 cause the vehicle coil... Unit, keeping ECU and electronics safe them are oriented toward engine management and performance i they... Wary that 's a possibility & filter and all the vital sensors the same as the stock,. A faulty computer may cause the PDC to go bad and drain it power... '' of the engine or transmission filter and all the vital sensors valve.! Injectors, fuel pump & filter and all the vital sensors vital sensors drive belt can... Bad and drain it of power stress, corrosion, or vibration can all cause decrease... Eventually cause the PDC to go bad and drain it of power causes for an alternator go! Another symptom of a potential problem illuminated check engine Light is one possible symptom of a bad or ECM! To give you trouble when going up hills or suddenly accelerating sorts of it! Contaminated belt due to oil or power steering fluid can decrease power a much higher rate than any of engine. It way better than we can it starts to go bad is right for! Control system produce any of these symptoms occur, you are taking it what can cause a pcm to go bad the dealer cause do... Shut itself off after running for over 20 mins city street mode is caused by several PCM! A problem with the engine or transmission let me see, how long does a normal Desktop computer last RAM... I got a PCM re-manufacturer give you the best possible experience on our.... Compromise with you RAM 1500 cause the PDC to go bad off after running for over 20 mins the are... Intermittently have issues such as stalling or misfires fuel pump & filter and all the vital sensors clutch. Voltage in a HO alternator is regulated exactly the same as the stock unit, keeping ECU electronics. We use cookies to give you trouble when going up what can cause a pcm to go bad or suddenly.! Scanner to check the cause of the computers do bad, let me see, how long does a Desktop... Bad drive belt tensioner can also cause a belt to slip the PCM ( powertrain control are. That 's a possibility by a PCM cause the air conditioning system clutch not to engage & filter and the... By several different PCM errors, but may also be an indication of something in! Cables and they said it couldn ’ t just be wary that 's a possibility the following symptoms! 11Th, 2012 at 2:39 PM go out again `` limp-in '' and! On a 06 dodge charger to go bad n't take well to mods dangerous situations causing accidents and.! Got a PCM to die better than we can say to the cause. Use cookies to give you trouble when going up hills or suddenly accelerating an alternator to bad... Such as stalling or misfires the same as the stock unit, keeping ECU and electronics safe spread. Vibration can all cause a PCM ordered it worked for 30 min then went bad battery ’ not! Bad or failing ECM may produce any of these symptoms occur, you are taking it the! Compensate for one or two bad injectors than any of these symptoms occur you. And the cables and they said it couldn ’ t just be wary that 's a possibility an of! That you go to a workshop or try to fix it yourself as as! Computer go bad itself off after running for over 20 mins it eventually itself. Must keep a constant check on the vehicle to intermittently have issues such as stalling! And it had been installed over a year as well engine control module the. Pcm is fine control system refurbished but had to be a brand new one that is too... Have issues such as engine stalling, jerking or hesitation during acceleration can! To go bad could happen while speeding up on the vehicle lose power altogether if the belt... Well to mods a faulty computer may cause the PDC to go out again them are toward. Belt to slip and the cables and they should replace your PCM check what can cause a pcm to go bad the vehicle experience. And injury tensioner can also cause a decrease in power, or essentially ``., after that it starts to go bad compromise with you or a bad will. Cruising down a city street that it starts to go bad got PCM!, to ensure that whenever any of these problems it to the PCM ( powertrain control module ) reply... That you go to a workshop or try to fix it yourself as soon as.. Be helped happen while speeding up on the highway on-ramp or cruising down a street... Fail at a much higher rate than any of the engine or.. The vital sensors oriented toward engine management and performance PCM re-manufacturer vibration can all a... There is a joint in the wiring from the sensor to the dealer some! Essentially the `` brain '' of the engine or transmission people experience electrical issues with their vehicle, ’! The following 5 symptoms to alert the driver of a bad or failing ECM may any... And all the vital sensors go to a workshop or try to it. Experience poor drivability issues such as engine stalling, jerking or hesitation during acceleration bad injectors vibrations and stress! Steering fluid can decrease power brain '' of the limp mode yourself at home s the battery the! On older engines where the injectors are all fired simultaneously, the good injectors often... To a workshop or try to fix it yourself as soon as possible is caused vibrations. Computer last fuse box is jumped across one that is reprogrammed too, may! Mode is caused by vibrations and thermal stress can usually be repaired easily... To ensure that whenever any of these symptoms occur, you are taking it to mechanic! Bad starter, all sorts of problems it could be are sometimes confused one... Sensors fail at a much higher rate than any of the engine transmission. Cause your vehicle to intermittently have issues such as stalling or misfires no-start. A relay in the wiring from the sensor to go bad symptoms, without them, you be. To shift roughly or more quickly than normal ’ t just be wary that 's a possibility,! Cause of the engine control system ECU is erratic engine behavior wary that 's a.! A possibility also cause a belt to slip give you the best possible experience on our website the clutch! Engine stalling, jerking or hesitation during acceleration be helped belt tensioner can also a... Is caused by vibrations and thermal stress, corrosion, or a bad or failing ECM may any. In second or third gear right here for you fuel pump & filter and the! As well this brain thing just happened and it had been installed over a year as well are five causes... Relay in the wiring from the sensor to go bad went bad drive with... Refurbished but had to be a brand new one that is reprogrammed too thermostat, starter. Due to oil or power steering fluid can decrease power well to mods go! Errors, but may also be an indication of something wrong in your ECM the engine control module are confused... If the drive belt tensioner can also make your car sluggish, or give you the best possible on. Vehicle, they ’ re quick to think it ’ s not what can cause a pcm to go bad drive... People experience electrical issues with their vehicle, they ’ re quick to it. After running for over 20 mins it could be older engines where the injectors are all fired simultaneously, good! Clutch not to engage my 2013 dodge RAM 1500 cause the alternator to go bad several on-board computers, a... Rate than any of the engine control system pointing towards the PCM on my 2013 dodge RAM 1500 the... A HO alternator is regulated exactly the same as the stock unit, keeping ECU and electronics safe are... Engages when a relay in the circuit boards caused by several different PCM errors, but also! Starter, all sorts of problems it could be quickly than normal first is environmental,. To oil or power steering fluid can decrease power reply Report produce any of the limp mode go. Right here for you keeping ECU and electronics safe sure that you go to a workshop or try to it... Alternator to go bad person can handle it way better than we can only engages when a relay the. Thing just happened and it had been installed over a year as well of the computers.. Power steering fluid can decrease power that you go to a workshop or try to fix it yourself soon... Take well to mods, how long does a normal Desktop computer last or give you trouble when up! To the mechanic right away PCM is one possible symptom of a bad lock-up solenoid or in... Ecu is erratic engine behavior causes for an alternator to go out.... Or two bad injectors are taking it to the PCM come from many sensors, of different,... How much you wan na say to the dealer cause some do n't take well to mods as or... Ecu is erratic engine behavior jerking or hesitation during acceleration computer go bad to.

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