Skip the auto shop - Our mechanics make house calls

Q: Possible ECM problem

asked by on

My GMC turned off at a stoplight. It started back up but the Service Engine Soon light came on. I took it to a friend who has a scan reader, and he told me the ECM needed to be changed.

Hello! Im assuming the code was a P0606 which indicates a PCM/ECM processor internal fault. I suggest checking the wiring and terminal at the ECM because at times it will be just a bad connection/wire causing the trouble code. There also cases in which the ECM will need a reprogramming not a replacement. To determine if your ECM falls in the reprogramming category you need to check the TSB’s (Technical Service Bulletins) for your vehicle. The TSB’S can be checked for your vehicle by YourMechanic or any other shop, but the VIN is required to retrieve the correct information. If the ECM itself is determined to be the issue or the ECM needs reprogramming both will unfortunately require a trip to the dealership. Only they posses the equipment needed to reprogram an ECM or to program a new ECM to the vehicle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: 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...

Q: When start out driving when accelerate does good to 2000 rpm and then when go to accelerate more it drops off and have to let off

Hello. From what you describe, it would appear that your vehicle is experiencing some sort of engine performance issues. Problems accelerating under load can be caused by many things. A few common causes are issues with the ignition, engine management,...

Q: Car cranks normally but won't start

Unfortunately for an issue like this, some diagnostic testing will need to be performed to identify if the problem is in the ignition system, the fuel system, or one of several other possibilities. I recommend having a certified mechanic, such...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...