1999 Chevrolet Suburban PCM/ECM

1999 CHEVROLET SUBURBAN
304,000 MILES • 7.4L • V8 • 4WD • AUTOMATIC
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HELLOHIWELCOME
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  • 21 POSTS
How do I know if I have a faulty PCM/ECM? What are the signs and symptoms? I do have a P0327 and P0430 code. Are these codes related to a faulty PCM/ECM?
Dec 1, 2015 at 12:45 PM
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WRENCHTECH
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There is not test for a faulty PCM. It is probably the hardest thing to determine to be faulty.

The basic way you find a bad PCM is to eliminate every other thing in the system, verify all the inputs and outputs to the PCM are correct and even then it's a roll of the dice.
Dec 1, 2015 at 4:13 PM
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