1999 Chevrolet Suburban PCM/ECM

Tiny
HELLOHIWELCOME
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • 7.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 304,000 MILES
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?
Tuesday, December 1st, 2015 AT 12:45 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
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.
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Tuesday, December 1st, 2015 AT 4:13 PM

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