Diesel Bombers

Chevy/GMC 6.2L and 6.5L Discussion of Chevy and GMC Trucks with 6.2L and 6.5L Diesel Engines

Speedometer gone nuts.

   
Old Jul 26, 2010 | 09:29 PM
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Moonraker_4's Avatar
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Default Speedometer gone nuts.
1994 GMC 3500 dully 6.5 with 220,000 miles The speedometer is reading 0-85 mph without truck moving.
 
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Old Jul 27, 2010 | 05:01 PM
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Woody35's Avatar
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clean all the grounds first
 
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Old Jul 28, 2010 | 08:17 AM
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DieselSlug's Avatar
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My truck also does it but only goes up to 10 mph. Common chevy thing.
 
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Old Aug 2, 2010 | 08:25 PM
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jdcoop8791's Avatar
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Mine did that for awhile, but now it is fine, the only thing i can think of it mud or dirt messin it up
 
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