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ECM (Engine Control Module)

Related articles

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

Question
The engine on my car has seized and is a write off. Should the manufacturer accept any liability?
Unfortunately, your car is outside the warranty period, so legally speaking, they do not have to warranty your motor. It is unfortunate your car has suffered so many failures and very frustrating for you because you have done what you...
Question
The computer is not recognizing the sensors
The computer monitors are all needed to be passed in order to pass emission testing. These computer monitors will show if the engine emission systems are all functioning properly and the engine control module (ECM) stores the test results as...
Question
My transmission won't go in reverse. Our mechanic said the ECM is bad. Would that cause that?
Hello. No, the ECM by itself should not cause a transmission failure. I suspect the low/reverse band has gone out on your transmission. The newer electronic transmissions have the ability to adjust to wear in the various clutches and bands...
Question
What do I do when the MAF isn't creating enough ground to the ECM module?
Hi there. First, check the harness connection on the sensor for any burned or corroded pins. That will cause a restriction and make the power drop. If the harness is good on the plug end, then disconnect the harness from...
Question
What's at fault, is it my computer module, a bad CAT, or a sensor?
Hi there. The codes would be helpful and don't clear them. A sticking O2 sensor can cause drivability issues and set the Check Engine Light. If there is a catalytic converter code, I would focus first on the O2 sensor...
Question
Does a new ECM for this year make model need to be flashed in order to drive the vehicle? 2004 Ford Focus
Yes, a new ECM will have to flashed before you can even start your vehicle. The "flashing" or programming of the ECM will require your VIN number to the supplier, who should be updating the most current software for your...
Question
My Check Engine Light is on with a code for the engine control module
Unfortunately, without diagnosing the car using a scanning tool to download any potential trouble codes there is no way to tell what other codes may be causing this light to come on. There many different trouble codes that can also...
Question
I have to actually use a heater on th ECU PROM to get my vehicle to start when its cold.
You have successfully diagnosed your truck. It definitely needs a new ECM. Electronics are very sensitive to temperature. There are relays inside the ECM box that you are heating, which makes the contacts expand and create an electrical connection. This...
Question
My car has an electrical failure due to rain leaking inside, what do I need to repair?
This could end up being a costly repair unless the pigtail replacements for the wiring harness are available. First, the water intrusion has to be repaired. The water has to have been leaking inside the vehicle for some time or...
Question
My car is not starting; what should I replace?
Your engine's computer gets crank signals from the crankshaft and camshaft sensors and then uses these signals to fire the coils. To see if the sensors are sending these signals to the computer, you can scan the computer using a...
Question
A scanner found the code P02B4, what does it mean?
That is an interesting code since your engine only has 4 cylinders. It is possible that the vehicle has the wrong information stored in the computer and is throwing a code for a V-8 engine. I recommend having your computer...
Question
Do I need to repair or replace my ECM?
You can get an ECM-related code for a number of different reasons. It can be something as simple as a voltage loss from a bad battery connection, or it may need a new ECM. I usually check the codes and...
Question
where is the ecm located in my 2001 lesabre and how do I get the part number off of it
Hello - to answer your location question, the ECM is behind the fuse and relay block of electronics under the passenger side of the dash (behind the glove box). The ECM is behind the other electronics, mounted flat against the...
Question
How do I find and identify the ECM module in a 2001 Buick LeSabre?
Hello. To answer your location question, the ECM is behind the fuse and relay block of electronics under the passenger side of the dash (behind the glove box). The ECM is behind the other electronics, mounted flat against the firewall,...
Question
Does 4k seem reasonable to replace the wiring harness on a 2011 Jaguar XJ?
I think you should get a second opinion on this. The wiring harness should be trouble free unless something has happened to damage it. Accidents, fires, water damage, salt corrosion, or electrical overloads can damage a wiring harness, but you...
Question
Trouble code P0607 Engine Control Module & P0138 Oxygen Sensor Circuit
Replacing an engine control module should never be a first step. There are a number of other problems that can give a PO607 trouble code. First the battery voltage should be checked, and if the engine is running, the charging...
Question
Is it dangerous to drive while reduce engine power light is on?
The engine control module (ECM) has a safety feature built into it when the ECM detects a major fault in the sensors or actuators that can cause the throttle opening to be limited. With the reduced engine power and throttle...
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...
Question
Computer went bad that controls spark plug
Before you can determine if the vehicle should be repaired you should have a qualified mechanic like one from YourMechanic come to you and scan the computer for you. You may have a sensor like the crankshaft sensor that could...
Question
Check engine light staying on
The definition of the fault code you are seeing signals back to a problem with the system fuel pressure. The fuel pressure may be too high or too low. The pressure readings from the sensor to the ecm may be...

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