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Mpg and range are not being properly calculated

Tiny
HENDRIX1
  • MEMBER
  • 1994 CADILLAC DEVILLE
  • 21,300 MILES
The display shows 23.0 mpg and the range displayed far exceeds what it should.
Tuesday, May 1st, 2012 AT 8:28 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Is your speedometer working correctly?

Roy
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Tuesday, May 1st, 2012 AT 11:40 PM
Tiny
HENDRIX1
  • MEMBER
  • 3 POSTS
Yes, and the amount of fuel being used and left in the tank both appear to be correct
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Wednesday, May 2nd, 2012 AT 12:44 AM
Tiny
HENDRIX1
  • MEMBER
  • 3 POSTS
I had a new fuel sending unit installed a couple of weeks ago. But the range and mpg are still not working properly.
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Wednesday, May 2nd, 2012 AT 12:45 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Then if all else is working the module may have failed.

It may not be available anymore. Call your local gm dealer and give them your vin number and see.

Roy
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Wednesday, May 2nd, 2012 AT 12:48 AM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
This is controled by the ecm. What is the range when it read 2 gal.
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Friday, May 4th, 2012 AT 7:32 PM

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