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On board diagnostics

Tiny
HALLNASS
  • MEMBER
  • 1996 CADILLAC DEVILLE CONCOURS
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 163,000 MILES
Going to work and unlike previously. Go to get In as usual, and key fob did not work. Had to use key (unheard of). Windows, ext lights, radio, and some gauges were dead. Interior dash including radio and dead gauges were lit but that was all. Says might not restart on panel. But, started and ran as usual despite the malfunction. Tried the built in diagnostic and it read there was no data for any of it. PCM, ECM, etc. Any suggestions?
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Tuesday, September 17th, 2019 AT 7:41 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I would start by having the battery tested. It sounds like you have low voltage causing the issue.

https://www.2carpros.com/articles/car-battery-load-test

I would also check the charging system as well to be sure it is maintaining the battery charge.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Roy
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Tuesday, September 17th, 2019 AT 8:54 AM
Tiny
HALLNASS
  • MEMBER
  • 2 POSTS
Thank you. I will be trying that today. Appreciate your time.
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Tuesday, September 17th, 2019 AT 9:11 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Keep us updated.

Roy
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Tuesday, September 17th, 2019 AT 9:15 AM

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