DTC U012087 Lost communication betwen the PCM and Alternator module.

Tiny
FRANKYBALE
  • MEMBER
  • 2007 VOLVO XC90
  • 3.2L
  • 6 CYL
  • TURBO
  • AWD
  • AUTOMATIC
  • 125,000 MILES
Alternator light come on after a few minute the car running. I've installed two Alternator from the Dealer and checked the continuity wire which goes from Alternator to PCM.
Wednesday, December 10th, 2014 AT 8:33 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,757 POSTS
It sounds like it is the PCM that has gone bad but to be sure here is a guide and a alternator wiring diagram to help you do some testing.

https://www.2carpros.com/articles/how-to-check-wiring

If it checks out get a used PCM and swap it out which should fix it.

Please let us know what happens so it will help others.

Cheers, Ken

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Wednesday, August 23rd, 2017 AT 9:07 PM

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