Q: Can an open gas cap which causes the Check Engine Light to come on cause the car to not start and the ECM to appear bad?

asked by on

Gas cap was left off. Check engine light came on after a couple days and stayed on for approx 3 weeks. The day after the check engine light went off, the car shook while driving, then lost power, and eventually would not restart when turned off. At first the car symbol with an exclamation point in the center lit up, then other lights when the car wouldn't start. Was told that the ECM needs to be replaces. Concerned that it may need to be reset and not replaced or that there could be a fuel issue causing the problem.

My car has 147900 miles.
My car has an automatic transmission.

Yes, there are a lot of things a bad gas cap or open gas cap can affect. If you don’t have a gas cap then you may be experiencing issues with debris getting into your tank or fuel filter and affecting the drive performance. Since the ECM is a costly repair, you may want to have another independent technician diagnose the vehicle’s loss of power. They will be able to confirm the cause of the issue or advise you on another fix.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Can an open gas cap which causes the Check Engine Light to come on cause the car to not start and the ECM to appear bad?

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: I have a Nissan Altima hybrid it wasn't start I took it to dealership after they made a diagnostic they told me you have to chan

The best recommendation I can given the circumstance is to take the vehicle to another place and have it diagnosed by a second qualified professional. This way you can have to Diagnostics to compare to see what matches up. If...

Q: Car hesitates and slows down badly at times. It almost stalls at times. It keeps slow speed at 20-30KM.

Hello. I would need to know the year of the vehicle to know where the fuel filter is located. If this is an older model, it is located under the vehicle. Most of the newer models only have a filter...

Q: My 2010 Audi A4 stopped out of no where at a stop sign maybe a month ago. It still has not started. All lights work

Hello. When this occurs, the first thing I do is try turning the engine over by hand. If I cannot turn the engine over by hand, then I know that the engine is seized. If it is seized, then it...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.