Skip the auto shop - Our mechanics make house calls

Q: Vehicle won't start after I switched the ECM.

asked by on

Wht is causing it not to start all the time censors hve been replaced no power in the vehicle when it is driven vehicle cranks when starting it

Hi there. First check the battery cables and make sure that they are clean and tight. Then check all of the sensors and make sure that all of them are connected. Then check the ECM and make sure that the harnesses are connected properly. A loose connection to the ECM or a sensor will cause the engine to not start up. If you need further assistance with your no start condition, then seek out a professional, such as one from Your Mechanic, to help you.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: My car won't start - Chevrolet Celebrity

Hello - A bad engine coolant temperature sensor is a reasonable diagnosis; it could certainly cause the engine to run too rich if it's sending a bad signal to the engine computer. Before purchasing a new temperature sensor, you can...

Q: Car won't start - 1989 Pontiac 6000

Hi there. Although it could be the starter that is drawing too many cranking amps (usually caused by a starter relay issue), you might have a different electrical problem (such as a ground issue) that is causing the hard start...

Q: I can't figure out why my car won't turn over without a jump even though the battery is fully charged.

If the engine cranks fine as soon as you connect jumper cables then you most likely have corrosion on the inside of the battery clamps where they touch the battery post. You should disconnect each battery clamp and clean them....

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...