Skip the auto shop - Our mechanics make house calls

Q: I put a new computer (PCM) in the car and now it won't start.

asked by on

I put a new computer box in the car now it won't start the old computer box was causing problems so I changed it and had a new one shipped and put it in and now and nothing's happening won't click current nothing Batteries Not Dead power comes on just won't start help please

My car has 140000 miles.
My car has an automatic transmission.

Hi there. When you had the computer shipped to you, first thing to ask is if the computer was programmed to your vehicle. If the vehicle was no programmed, you will have to get it programmed at a dealership. If the computer was programmed, then check all of the connections to the computer and make sure that the grounds are hooked up. Check the battery cables to see if they are tight and clean. Check the wire connections to the starter solenoid on the starter and make sure that they are tight and clean. If you need further assistance with the no start situation after replacing the computer, 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!
  1. Home
  2. Questions
  3. I put a new computer (PCM) in the car and now it won't start.

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: Engine will crank but not catch. .

Hello. The most common causes of this occurring with your vehicle is a bad crankshaft position sensors or a failure in the timing belt. Both of these will cause this to occur. I usually start with a compression test on...

Q: Overdrive stuck on OFF

Hello. The button itself might be damaged. Every switch and button accessible to the driver will have a way of being serviced. It's just a matter of what panels or access points you have to get into in order to...

Q: The Check Fuel Cap light is on.

In order to find out what is causing the leak to be detected the fuel vapor system and cap will need to be smoke tested to see where the leak is. The most common is the seal on the fuel...

Related articles

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...
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...
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...