On board diagnostics

1996 CADILLAC DEVILLE CONCOURS
163,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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HALLNASS
  • MEMBER
  • 2 POSTS
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?
Sep 17, 2019 at 7:41 AM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 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
Sep 17, 2019 at 8:54 AM
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HALLNASS
  • MEMBER
  • 2 POSTS
Thank you. I will be trying that today. Appreciate your time.
Sep 17, 2019 at 9:11 AM
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ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
You are welcome.

Always glad to help.

Keep us updated.

Roy
Sep 17, 2019 at 9:15 AM