Check Engine Light Turns On. If your issue is just a no-start, then it's very likely that your PCM is fine. 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. 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. 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. No. Another symptom of a bad or failing ECU is erratic engine behavior. 1. An illuminated Check Engine Light is one possible symptom of a problem with the ECM. The battery is not causing any of these problems. The power train control module monitors the drive train system. Most of them are oriented toward engine management and performance. 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. Grounds, bad grounds to the ECU, Alternator or the Motor can cause all sorts of crazy things and can cause big changes in voltages. Your car’s … I'd just be wary that's a possibility. 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. Now you must keep a constant check on the vehicle. Answer. July 06, 2010. September 29, 2016 . Replacing the torque converter can be an expensive endeavor, because the transmission must be removed from the vehicle to get to the torque converter. Don't know how much you wanna say to the dealer cause some don't take well to mods. 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. One bad injector will cause a noticeable misfire and usually set a P030X misfire code (where X represents the cylinder that is misfiring). It eventually shut itself off after running for over 20 mins. what are the symptoms, without them, you can be helped. Asked by jbboeing in Lumberton, NJ on . It may even go into a "limp-in" mode and remain frozen in second or third gear. The primary inputs to the PCM come from many sensors, of different types, that are spread around the car. When the ECM has any issues, it can cause all sorts of problems with the vehicle, and in some cases even render it undrivable. A bad MAF sensor can cause your vehicle to experience poor drivability issues such as engine stalling, jerking or hesitation during acceleration. Sometimes a slipping belt can cause a decrease in power, or a bad drive belt tensioner can also cause a belt to slip. 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. But this brain thing just happened and it had been installed over a year as well. 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? 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. 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. The voltage in a HO Alternator is regulated exactly the same as the stock unit, keeping ECU and electronics safe. 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. What causes Code P1693? The engine control module monitors the sensors … On older engines where the injectors are all fired simultaneously, the good injectors can often compensate for one or two bad injectors. Limp mode is caused by an electrical problem with the engine or transmission. We use cookies to give you the best possible experience on our website. 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. This could happen while speeding up on the highway on-ramp or cruising down a city street. It was P0882 not P0822.Mechanic said it read TCM Power input low, and recommend replace PCM (not sensing power from fuse block). These sensors fail at a much higher rate than any of the computers do. What can cause damage is too low voltage. Micro-cracks in the circuit boards caused by vibrations and thermal stress can usually be repaired quite easily by a PCM re-manufacturer. When people experience electrical issues with their vehicle, they’re quick to think it’s the battery’s fault. bad pcm, bad thermostat, bad starter, all sorts of problems it could be. Unless the PCM is completely fried, someone with a compatible can tool can hook it up and check the PCM. Asked by lovey129 in Columbia, SC on . My car has 121000 miles. My car has an automatic transmission. I got a pcm ordered it worked for 30 min then went bad. Bad Performance or Fuel Economy. It can also make your car sluggish, or give you trouble when going up hills or suddenly accelerating. Popular Answer. Also there is a joint in the wiring from the sensor to the PCM. And they said it couldn’t just be refurbished but had to be a brand new one that is reprogrammed too. Faulty car battery can affect your engine computer. These issues can create dangerous situations causing accidents and injury. I think they need to make a compromise with you. Moreover, sometimes you will lose power altogether if the drive belt snaps in half. Can a PCM cause the air conditioning system clutch not to engage? 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. What can cause a pcm on a 06 dodge charger to go bad. It may not shift smoothly. Do you. You pay for the battery and the cables and they should replace your PCM. This can be caused by several different PCM errors, but may also be an indication of something wrong in your ECM. Wednesday, July 11th, 2012 AT 2:39 PM. Look at the coil, injectors, fuel pump & filter and all the vital sensors. 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 . 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. It is not very often that the PCM is bad. Can a bad pcm cause exhaust to throw white smoke? 2013 Dodge Durango. If you are not staring at … A bad or failing ECM may produce any of the following 5 symptoms to alert the driver of a potential problem. 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. 3 Replies. That's it - Answered by a verified Dodge Mechanic July 06, 2010. Make sure that you go to a workshop or try to fix it yourself as soon as possible. If you have a bad car battery, it can make your car’s engine computer (ECU) act a little bit nutty. SPONSORED LINKS. The AC clutch only engages when a relay in the fuse box is jumped across. A faulty electrical system in a car can play some very tricky games, and your car’s battery is part of that system. It was weird as hell. 5. 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! Since the ECM controls your air to fuel ratio and transmission, a faulty unit can cause your gas mileage to drop through the floor. Troubleshooting is pointing towards the PCM (powertrain control module) 1 reply Report. After all, an experienced and knowledgeable person can handle it way better than we can. 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. It’s not good to drive around with limp mode. That is fair in my book. The car in limp mode can go up to about 45, after that it starts to go past 5 - RPM. This may cause the transmission to shift roughly or more quickly than normal. Why does the computer go bad, let me see, how long does a normal Desktop computer last? 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. came back few weeks later and was taken to another mechanic who said it had a pcm and everything else seemed to "work fine". 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. You can buy an obd2 scanner to check the cause of the limp mode yourself at home. 1999 Dodge Intrepid. Besides, to ensure that whenever any of these symptoms occur, you are taking it to the mechanic right away. I know that's different! have the same problem? What causes a knock sensor to go bad is right here for you. Excessive heat can cause it to go bad. Common Causes of Alternator Failure. I hope that this helps. Can a chip in your key cause your car battery to go bad and drain it of power? Proper installation is critical. It may shift at the wrong rpm. Can the PCM on my 2013 Dodge RAM 1500 cause the PDC to go bad? 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. The vehicle misfires on … Burning Smell. Limp mode is a security function. 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. Also, cracked, brittle, torn belt and contaminated belt due to oil or power steering fluid can decrease power. Below are five common causes for an alternator to go bad. The first is environmental issues, thermal stress, corrosion, or vibration can all cause a PCM to die. The PCM is one of potentially several on-board computers, or essentially the "brain" of the engine control system. A bad lock-up solenoid or debris in the valve body. dandd on . A faulty computer may cause the vehicle to intermittently have issues such as stalling or misfires. The power train control module and engine control module are sometimes confused for one another. Yes. Putting back in a bad battery will eventually cause the alternator to go out again.

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