mpg and range are not being properly calculated

1994 CADILLAC DEVILLE
21,300 MILES
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HENDRIX1
  • MEMBER
  • 3 POSTS
the display shows 23.0 mpg and the range displayed far exceeds what it should.
May 1, 2012 at 1:28 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
is your speedometer working correctly??

Roy
May 1, 2012 at 4:40 PM
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HENDRIX1
  • MEMBER
  • 3 POSTS
Yes, and the amount of fuel being used and left in the tank both appear to be correct
May 1, 2012 at 5:44 PM
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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.
May 1, 2012 at 5:45 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 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
May 1, 2012 at 5:48 PM
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CADIEMAN
  • ✓Experienced Mechanic
  • 3,544 POSTS
this is controled by the ecm.what is the range when it read 2 gal.
May 4, 2012 at 12:32 PM
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