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pcm

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Question
Pcm ecu car won't start
Assuming the ECM is still working enough to report problems, getting any problem codes out of the system with a code reader is your best clue at this point - whether the Check Engine Light is illuminated or not. If...
Question
What else can i do to diagnose the exact problem of my cars miss fire on the 3rd cylinder?
If electronics and fuel supply have been ruled out, the next possible cause is a mechanical issue. Have a compression test done across all 4 cylinders. If #3 is lower than the other three cylinders, it is possible there is...
Question
Pcm
Hello, thanks for writing in about your Ford F-150. I'm curious if you got the new PCM from the dealer. You should check if have the exact same part number on it. If the part numbers do not match and...
Question
Where could I find a TSB for my 2005 mustang GT regarding my Throttle body or Throttle Position Sensor?
I went through all the technical bulletins and recalls and did not find anything for reprogramming your computer or repairs to the TPS or throttle body. The ones that you are not finding may not be the right ones. I...
Question
I need help with diagnostic trouble codes that suddenly appeared making vehicle almost undriveable.
Firstly, you should have the battery disconnected and the PCM disconnected. Check their connectors for any problems and apply dielectric lube to the connectors so the connection is clean from corrosion. If the problem continues then replace the PCM. All...
Question
No Crank No Start, dashboard lightup with No Bus warning
Considering the problems at hand it may be best for an in person diagnosis of the situation. The problem could be as simple as a failed sensor or broken wire, or the power-train control module itself going faulty. Considering the...
Question
pcm problem maybe
Hello. The first thing I would check to see is if perhaps the replacement wire is causing an issue. If the wire is old or worn it may not be hindering the spark, and causing the vehicle to experience drivability...
Question
overheating no cooling fans
The relays are turned on by the Powertrain Control Module (PCM) by grounding the control wire of the relays. The PCM needs input from the engine coolant sensor above the water pump to sense whether the engine is overheating before...
Question
Getting 2 then 4 abs codes, brake shutters, speedo dies and engine slowes when Brake and absolutely lights come on,
You definitely want to start by inspecting the front and rear wheel speed sensors; a failure in these circuits will result in several other problems. Begin by connecting a scanner to see if the Powertrain Control Module (PCM) is registering...
Question
PCM
I would question why the computer needs to be replaced. If the computer is causing a problem like the vehicle will not start or some other issue, then I would recommend the dealer to diagnose it since it will need...
Question
Fuel trim bank 1
If your vehicle is having issues with the fuel trims, this is usually an issue with the powertrain control module or engine computer. The powertrain control module is responsible for setting and adjusting the fuel trims as the vehicle is...
Question
Temperature gauge erratic/ rpm erratic
Most likely this is a problem with the instrument cluster. Even so, I would make sure your vehicle isn't actually overheating. The best method for doing this is with the use of a infrared temperature gun. They aren't cheap, but...
Question
Can i buy a used pcm and have the dealership reflash it to my car?
Hello, thanks for writing in about your Dodge Challenger. From what you've described, this is a question you'll have to ask the dealer. Most PCM's I know of do not let you reprogram them to a different vehicle VIN number...
Question
Starts for a second, dies, and won't start again unless you disconnect battery.
Hi there. The symptoms that you are having seems to be with a faulty PCM (powertrain control module, computer). If you are able to reset the computer by disconnecting the battery, then restart the vehicle, there is an issue with...
Question
Can you have a bad PCM but have no check engine light on?
Hello and thank you for contacting YourMechanic. PCM's typically fail for one of two reasons: voltage overloads (often due to a short in a solenoid or actuator circuit) or environmental factors (corrosion, thermal stress or vibration). If water gets inside...
Question
I have a Code P0601 on the PCM. I replaced the PCM, and now I have a code P0118, code P0123, and code P0193.
Hi there, the short answer to your question is no . A PCM with a P0601 (which is a memory module error in the PCM) cannot reliably retrieve codes for the codes you list (P0118 - coolant temp sensor, P0123...
Question
My Jeep has a full battery but is not starting every time I go to start the car.
Hi there. There are several possible causes for the lightening bolt to remain on. The PCM (powertrain control module) has recognized an electrical fault in the ETC (electronic throttle control) system and disables the starter relay, creating a no crank...
Question
How do I bypass the PAT system? Or how do I bypass the anti-theft command controlled by the PCM?
The PATS system cannot be bypassed. You are required to have a coded PATS ignition key in order for the computer to turn on the spark and fuel to the engine. If you do not have a PATS programmed key...
Question
PCM
It sounds like the voltage regulator may be overcharging causing it to essentially electrocute the PCM. As you may know, the voltage regulator regulates the voltage in the system by not allowing the alternator to over charge the battery. As...
Question
What's the difference between the ECM and PCM?
The engine control module (ECM) controls all the engine functions to keep it running correctly monitoring all the sensors of the engine. The power train control module (PCM) will include multiple control modules in one case called a PCM. The...

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