Skip the auto shop - Our mechanics make house calls

Q: I can't get the car to turn over

asked by on

It like there no when you try to turn it over theres nothing i have all the dash lites working and iv change the starter put a different computer on it and I don't have fuel pressure either
My car has an automatic transmission.

A: To start, computers, aka PCM (powertrain co...

To start, computers, aka PCM (powertrain control modules) rarely fail. They are complex units that require many different inputs to initiate the desired response. Having replaced your PCM already, you may have already traded in your old PCM as a core. If you happen to still have it, I would plug it back in and continue by doing some testing at the starter relay. From the relay you can check to see if it is the PCM that isn't commanding the relay to supply power to the starter ored if there is something else wrong.

It is possible the relay is the source of the problem. You will need a wiring diagram and then you can use a jumper wire to supply power to the starter solenoid from the relay connector. If the starter turns over, you have confirmed that this part of the starter system is good.

Having replaced the PCM, this is likely the cause of the lack of fuel pressure. As far as why it won't crank, you have complicated the issue by replacing the PCM. The new PCM needs to be programmed using a professional scan tool. If you have already done this, then you can begin diagnosing the no crank, assuming the PCM has been successfully programmed.

If you should still need help with this diagnosis, I recommend the following inspection to help you out. A certified professional from YourMechanic can come to your car's location to diagnose the starting issue and assist with 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: Car shut off when driving, 2009 Toyota Camry

Has the Check Engine Light illuminated after the stall? A loose battery connection can cause abnormal problems on many vehicles. Have the battery and charging system tested for issues and check your maintenance schedule to make sure services are up...

Q: bad wires

There could be a short or a hot spot where wires come close to the exhaust and the shielding is damaged or missing. There have been many cars with your engine and ignition system that come up with burned or...

Q: There is no fuel to the fuel rail. There are error codes of p0461 and p2066. The fuel tank is half full.

Hi there. The fuel level sensor in the fuel tank has either failed or has an open in the wiring and the computer has caught this and stored the codes P0461 and P2066. You will need to remove the fuel...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.