- 1994, 1996–2000 Factory-verified
the kit pages also print EFI
GM Heritage factory kit — 1994 Chevrolet Truck, p.22.GM Heritage factory kit — 1996 Chevrolet Truck, p.24.GM Heritage factory kit — 1997 Chevrolet Truck, p.73.
EF1 Factory-verified
Also documented for CadillacGMC
Documented applications
- 1998–1999 Factory-verified
- 1998–1999 Factory-verified
This page aggregates every documented appearance of EF1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.