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June 1, 1997 Service bulletin

No upshift/2ND gear only after cold start-intermittent DTC 87 - high ratio error (replace eprom)

Chevrolet technical service bulletin 677153A for 1994-1995 Chevrolet C Series(Light), 1994-1996 Chevrolet G Series and 1994-1996 GMC G Series and others.

Bulletin number
677153A
Component
Electrical system: ignition: module
Summary
No upshift/2nd gear only after cold start-intermittent dtc 87 - high ratio error (replace eprom). Tw

Owners of these vehicles have filed 9 complaints in the electrical category.

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