2002 GMC 3500 Sierra gas gage quit working?

mikieav

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This happened once before. Cleared a code and it worked. What is the code or is there something else wrong. The guy that cleared it said something about something from the second tank to the first tank. Could use some help on this one.
 
Sounds like a bad ground,the sending units have to have a very good ground to work or the cross over switch is the issue.
 


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