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ECM (Engine Control Module)

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Symptoms of a Bad or Failing Engine Control Module (ECM)
Common signs include the Check Engine Light coming on, engine stalling, misfire, or performance issues, and the car not starting.
How Long Does an Engine Control Module (ECM) Last?
As technology continues to advance and move forward, so does the way our vehicles operate and run. It seems more and more parts rely on computers and sensors than ever before....
What Is a Vehicle's Electrical Control Unit?
You’ll hear the term ECU bandied about in automotive circles, but what does it mean? The most basic definition is “electrical control unit” (ECU) which is a generic term applied to any...

Related questions

Does the VIN number have to be in the ECM for the vehicle to run?
Some new ECMs will give you a certain amount of free starts before it will not start unless the VIN is added. I am not sure if this is the case with your ECM but you have a dealer telling...
Car cranks over but won't start - 2004 Nissan Sentra
If the fuel pump is not "whirring" momentarily when you turn the key "on", either the pump is not receiving power or it's non-functional. You might try probing the fuel pump harness for 12 volts at moment key is turned...
My car have a RAF problem
Hello, thanks for contacting YourMechanic. When a vehicle is started up and about a liter of water emerges from the tail pipe, there is a problem. One problem is that you could have too much condensation in your pipes. The...
How many computers does my truck have?
Hi, thanks for writing in. An Isuzu NPR should have one ECM (engine control module), which is the computer. This is the brain of your vehicle. It is what regulates your fuel to air ratio as well as all electrical....
Truck won't start
Hi, thanks for writing in. If the truck is getting the correct fuel pressure to the fuel rail, but does not deliver fuel to the spark plugs, this may suggest a fuel injector problem. I would start with checking the...
I just had my engine replaced. Car was not starting, could it be the computer module went out? Can I buy that?
Hi there. The likelihood the ECM is at fault is remote unless, you shorted out something in the course of engine replacement. The fact it wanted to crank leads me to believe you have a battery and/or starter issue. The...
4l80e transmission in limp mode
Hello and thanks for your question. When changing out the transmission and ECM from another vehicle to your vehicle with the same year and model can effect many things. Check all plug to ensure that everything on the transmission is...
Missing/Broken ECU - 1989 BMW 325i
If your ECM is failing or has failed, it shouldn't be extremely difficult to find a good shop to rebuild or replace them. There are a number of electronic rebuilders who rebuild ECMs (w/warranty). Also, there are a number of...
Throttle position sensor light on
For many vehicles, regardless of manufacturer, there is the need to do a "re-learn" sequence (after replacing the TPS or a battery) so the TPS and transmission will work smoothly. You may have to drive the vehicle for a bit...
hi i have a fiat sienna that has no pulse on the injectors from the ground in the ECU. the car has spark on the plugs and the pump
Hi there. No injector pulse, more than likely, is a faulty ECM. There are steps you can take to confirm the problem. Accessing the ECM (electronic control module) for codes may help direct you towards the area of fault. Having...
My car wont start, ECM issue
Hi. I think the best thing to do with this situation is to replace the motor and get the proper radiator for the car. If the ECM has a fault or has gone bad completely the ECM will need to...
in my car where and how can i locate the ECM
First, why do you want to replace the PCM and/or BCM? It's very rare that a module goes bad. The problem is usually something else. I recommend having a professional, such as one from YourMechanic, diagnose and repair your vehicle;...
Does it have a crankshaft piston sensor
There is a technical bulletin, TSB 89-24-9, for a hard start after a short heat soak. The engine control module does not control ignition timing correctly when hot and thermostat lets engine get too hot. The recommendation would be to...
Can engine control module be repaired
Hello. I do not believe that any module or computer on a vehicle can be repaired. Unfortunately, these are sealed units and must be replaced if they fail. In addition, many engine computers require special programming from the dealership once...
possible bad ecm if I reset it will that help me in finding out if its bad.
Hi there. From the description you provided, it is unlikely, the ECM (electronic control module) is at fault. First and most important, when disconnecting the battery, always disconnect the negative terminal first and reconnect last. Starting with the positive terminal,...
No throttle response on 2012 dodge avenger
In the future, please include the motor size. Thanks. Your electronic throttle system consists of the throttle pedal assembly with an accelerator pedal position sensor, the throttle body which consist of a TPS (Throttle Position Sensor), throttle plate actuator,...
Car won't start after driving any distance. I have to let it cool down before I can start the engine again.
It's curious that you don't seem to have a code in the ECM. Usually if you have a malfunction that prevents the car from starting, there will be a code resulting. That being said, it sounds like you may have...
new distrbutor and module still stalls at red lights could the ecm be going bad
It certainly sounds like you are on the right track. I would recommend replacing the ECM to determine if it resolves the issue. I would also recommend checking the circuitry near this computer to be sure that no wiring problems...
where do i find the ac control module and what it looks like.
Hello. If the car needs the HVAC control module that is the control panel itself. It contains the entire computer unit as one unit. I usually test the power supply to the module first and the ground. It is common...
Check Engine light on. Would the computer give all error codes in one shot? How do we know the engine's condition?
Hi there. From the description you have provided, I'm am inclined to agree with your assessment of a used engine being installed in your vehicle. An inspection of the engine, by a qualified technician could determine whether the engine is...

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