Check engine light comes on only when on the highway

Asked by Mar 12, 2017 at 04:05 PM about the 2004 Chevrolet Silverado 2500HD 4 Dr LS 4WD Extended Cab LB HD

Question type: Maintenance & Repair

While driving on the highway the check engine lite comes on only on the
highway what could be causing it to happen?

1 Answer


Can't tell you exactly till we have the 4 digit fault codes. It could be many things, but you can help us by having the truck scanned for the codes. The codes are stored in memory, and the light doesn't have to be on. Stop over to your nearest auto parts store, most times they will scan for free if you ask nice.

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