Engine starts in ignition run position

2004 CHEVROLET SILVERADO

300,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC

INDIANAMARK

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When key is turned from off to run, the starter engages without reaching the run position. I have changed the starter relay and the ignition switch. I could use some advice on why my starter is being powered in the run position? Thanks.

Jan 22, 2018 at 10:20 AM

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STRAILER

AUTOMOTIVE REPAIR CONTRIBUTOR
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Hello,

The only thing I can think of is the wiring is messed up somehow or the PCM needs to be replaced. Lets check the power wires first to make sure nothing is crossed.

Here is a guide to help you see if there is power coming from the ignition switch when it is not suppose to:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

If there is not power and the starter engages it is a PCM problem and it needs to be replaced.

Below is the starter wiring diagrams and PCM location which you will need a shop to program for you.

Check out the diagrams (below).

Please let us know what you find. We are interested to see what it is.

Cheers, Ken

Images (Click to enlarge)

Jan 23, 2018 at 11:10 AM

INDIANAMARK

MEMBER
5 POSTS

Thanks so much. I will tackle this in a week and report back.

Jan 23, 2018 at 11:55 AM