Skip the auto shop - Our mechanics make house calls

Q: What does ECP and ECM mean and is it bad?

asked by on

I had been driving my car and it was working perfectly. I had went to the store and when i got back to the car and tried turning it on it just would't work. The battery was fine and so was everything else but the letters ECP had showed up. I took it to the mechanic and they told me the car had ECM but i am not sure what that is and I'm not sure what to do. I was just wondering how serious it was and what do you recommend doing about it?

My car has 89000 miles.
My car has an automatic transmission.

A: Hello. I suspect you mean EPC (not ECP), wh...

Hello. I suspect you mean EPC (not ECP), which stands for electronic pedal control or electronic "gas pedal linkage". There is no longer a physical cable, wire or lever between the gas pedal, and the throttle body on the engine which regulates desired power.

The "gas pedal" has an electronic actuator and wiring that connects it to the electronic throttle position actuator on the throttle. These components are "paired", coded to each other in software, and have some level of awareness of each others precise characteristics.

If you replace one or the other, they must be "paired" to each other. Most likely the throttle position sensor is failing, and the software is detecting this. There should be problem codes indicating which component is failing (Check Engine light). ECM simply means "engine computer module", the electronics that manage your fuel injection, ignition timing, and if you have an automatic transmission that regulates how the transmission should shift based on gas pedal activity. Virtually all cars and trucks built today have at least one ECM. I would recommend having a Check Engine Light inspection completed by a mobile, professional mechanic, such as one from YourMechanic, to diagnose this problem, get an accurate assessment of damage, and estimate for repairs.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Why is the power from my battery not coming through? It was fine yesterday.

When you experience a complete failure of power in the fashion you have described, it is most frequently a bad connection at the battery. Either the terminals or one of the cables has an issue. It's important to understand that...

Q: How to replace ECM on a car with a P0604 code

P0604 is an internal memory error in the ECM. It will need to be replaced. It may be possible to get a pre-programmed ECM for you to put in, but this would be a question to pose to your local...

Q: Engine light

You will need to have Check Engine Light tested and diagnosed to see what the code is. You may be having a cooling fan issue or some other problem that is causing the light to illuminate and the A/C to...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.