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ECM (Engine Control Module)

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Symptoms of a Bad or Failing Engine Control Module (ECM)
Common signs of a failing PCM/ECM/ECU include the Check Engine Light coming on, engine performance issues, and the car not starting.
P0484 OBD-II Trouble Code: Cooling Fan Circuit Over Current
Diagnostic Diagnostic Trouble Code (DTC): P0484 P0484 code definition When the PCM detects a voltage reading from the electric cooling fan control circuit that is either too high or too low in comparison to the manufacturer’s specifications, the P0484 code...
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...
What Is a Vehicle's Electrical Control Unit?
You’ll 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 system that controls a system or subsystem...
What Is a Vehicle's Electrical Control Unit?
You’ll 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 system that controls a system or subsystem...

Related questions

Question
What Is an ECU and What Does It Do?
The electronic control unit (ECU) used in today’s cars and trucks is used to control the engine and other components’ functions. An ECU is a computer with internal pre-programmed and programmable computer chips that is not much different from a...
Question
My check engine light came on
You can try and have the throttle body and idle control valve cleaned first and code cleared. If the code returns then you will need to have the computer program updated for this code. There is a technical bulletin #13-FL-005....
Question
Idling erratically.
There is a possibility that your ECM could be causing your idling issue. However in my experience control modules do not go bad very often. The problem could be as simple as a throttle body that needs to be cleaned...
Question
I purchased a new computer for it does it need programed
You would need to have it programmed to your VIN. Have the computer scanned to see if you have a good crank shaft signal first, before replacing the ECM. You may not need the ECM replaced; you may have a...
Question
Car will not start.
Since you replaced some things already we can certainly rule those out. When you replaced the fuel pump did you replace the filter also? a clogged fuel filter can certainly make the car act this way. Also, considering the age...
Question
What will happen when a Ford ecm diode goes bad?
The PCM power diode is put into the fuel pump and PCM relay power circuit to prevent power surge feedback into the circuit called flyback voltage then can be higher than normal operating voltage. The computer may get flyback voltage...
Question
Check engine light not working.
If the check engine light is not coming on, then that is a good sign. If your dashboard before displayed the check engine light before and now it is not coming on, then the dashboard warning light could have burned...
Question
I have a 2006 Honda Accord and the dash lights and radio willl sometimes go off then come right back on when I'm going about 40 mph.
The code P0685 refers to the main ECM (computer) relay has lost power. Check the main relay and see if its getting hot. A hot relay will disconnect to cool off and reconnect. If the relay is getting hot, then...
Question
I need the ecm/pcm replaced do you guys come out and do that?
YourMechanic can replace the ECM/PCM on your vehicle if a diagnostic has determined that it has failed. However, please note that PCM's rarely are the cause of a no start condition and thus all other potential causes should be investigated...
Question
When it rains hard right rear window goes down and sends car into limp mode. The trunk also leaks.
There are small bus computers in your vehicle that control multiple items throughout the car. There is a bus controller in each door on the car. It is possible that the door that is leaking water inside it is causing...
Question
Replaced E38 computer on 2006 Pontiac g6. Should I try it out or does it need programming first?
The computer (ECM) will need programmed to the VIN of your vehicle before attempting to operate the vehicle. If you need further assistance with programming your computer, then seek out a professional, such as one from Your Mechanic, to help...
Question
No power to the ignition.
When hooking up the battery cables backwards, the polarity of the voltage is reversed and will cause the fuses to pop, the alternator to burn out the regulator, and the computer (ECM) will burn up the ground circuit inside the...
Question
Idles but when driving it acts like its out of fuel.
Check all of the battery ground cables to the car on the battery, engine, and chassis. There is a bad ground somewhere that is causing the ECM to not work properly. This would cause the fuel pump to not work...
Question
My boy accidentally hooked battery cables up wrong on his truck, and now it's got white smoke that smell like gas coming out.
When hooking up the battery cables backwards, the ground became the hot and the hot became the ground. Most likely the computer (ECM) could have failed and the fuel pump may have burned up. I recommend checking all of the...
Question
2011 Scion XB ECM replacement cost.
Hi there. The time to replace an ECM (Engine Control Module) on a 2011 Scion xB with a L4-2.4L engine is around 1 to 2 hours not including programming the ECM. ____________________________________________ Billing question was sent to CS for the...
Question
What is the price range to reset and/or reprogram the computer?
Billing question was sent to CS for the cost to reset or reprogram a ECM (computer) for a 2008 Volvo S80 with a L6-3.0L turbo engine.
Question
I put a engine out of a 2007 malibu in the 2005 cobolt. Why will the engine not start
Hi there. Check all of the sensors to the engine and make sure that all of them are connected. Check the computer and see if there is an wires disconnected to it. A loose wire on any electrical system will...
Question
I took the engine out of a 2007 malibu and put it into a 2005 cobolt and now it won't start.
Hi there. Check all of the sensors to the engine and make sure that all of them are connected. Check the computer and see if there is an wires disconnected to it. A loose wire or a sensor to the...
Question
I have a 2.3 L and switching to a 3.0 L. How do I know what new ECM and wiring harness to buy?
Hi there. The best thing to do is go to the local parts store and have them get a harness for your vehicle with a 2.3L engine and a 3.0L engine. Then you can compare the different wiring harnesses to...

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