mpg and range are not being properly calculated

1994 CADILLAC DEVILLE
21,300 MILES
Avatar
HENDRIX1
  • MEMBER
  • 3 POSTS
the display shows 23.0 mpg and the range displayed far exceeds what it should.
May 1, 2012 at 8:28 PM
Advertisement
Avatar
ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
is your speedometer working correctly??

Roy
May 1, 2012 at 11:40 PM
Avatar
HENDRIX1
  • MEMBER
  • 3 POSTS
Yes, and the amount of fuel being used and left in the tank both appear to be correct
May 2, 2012 at 12:44 AM
Avatar
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 2, 2012 at 12:45 AM
Avatar
ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
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 2, 2012 at 12:48 AM
Avatar
CADIEMAN
  • ✓ASE Certified Mechanic
  • 3,544 POSTS
  • ASE Certified Mechanic
this is controled by the ecm.what is the range when it read 2 gal.
May 4, 2012 at 7:32 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.