Skip the auto shop - Our mechanics make house calls

Q: reduce engine speed , trac ,and service engine light on. Had gas pedal assembly and throttle replaced.. Wire harness or computer n

asked by on

Reduce engine speed, trac, service engine light on. Had gas pedal assembly replaced twice and throttle once. Next step wire harness or ECM computer. Any suggestions.

My car has 161000 miles.

A: This vehicle may have a wire harness issue ...

This vehicle may have a wire harness issue of bad crimps on the connectors to the cluster, engine control module (ECM), and other areas that can cause these intermittent failures.

The codes you are receiving are most likely the areas in the harness causing the problems. There are many technical service bulletins (TSBs) for various problems in the harness and I cannot list all of them in this writing.

I would have your warning light issues checked by a mechanic that is familiar with the problems in these vehicles' harnesses, and recommend the best path to repair.

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: At 10 mph, ABS system has clunk noise. 2013 Buick Verano

Hey there, thanks for writing in about your 2013 Buick Verano. The first question is whether or not the ABS light is coming on. If so, then you may want to look into replacing or testing what is called a...

Q: Car won't stay running unless MAF is unplugged.

Short of a vacuum leak, this seems to indicate to a dirty or failing idle air control valve. As you know, the idle air control valve monitors the air intake as it is mixed with fuel prior to being injected...

Q: Service engine light

The service engine light or check engine light coming on in cooler temperature could be you gas cap seal but you would need to have the computer scanned first to see if you have codes in memory of the computer...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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.