SERVICE AND SERVICE ENGINE SOON LIGHTS ARE ON

  • Tiny
  • putnamrichardson
  • 2002 Saturn Vue
  • 91,000 miles

"Service" and "Service Engine Soon" lights are on. No DTC codes are showing. Engine runs great, transmission shifts perfectly. No known issues or problems. If the lights weren't on you'd swear the Vue was perfect. The only other indicator is the Tach. At cruise speed it will drop to "0" then pop back up to right RPM. It wil do this every minute or so, no regular pattern like there's a short, but I don't believe a short is the issue.

My Question: Why are the lights on and the Tach acting strange? BCM? Or what? Thanks.
Putnam

Sunday, November 11th, 2012 AT 10:30 PM

1 Answer

  • Tiny
  • saturntech9
  • Expert
  • 28,827 posts

I would have the bcm etc scanned for codes the diyer scan tools only read a engine and transmission codes you could have a bad bcm.

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Monday, November 12th, 2012 AT 1:41 AM

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