Chevrolet/gmc: shuttle bus generator modification P0621

Bulletin number

PIP-4714

Component

Electrical system: alternator/generator/regulator

Summary

Chevrolet/gmc: shuttle bus generator modification p0621. Dealer may encounter concern of a ses light on with dtc p0621 found. Many cases these vehicles are used in a shuttle bus application. Some upfitters of the shuttle buses are ordering the vehicles with dual generators and removing one of the generators to install an add on air conditioning compressor.

Owners of these vehicles have filed 2 complaints in the electrical category.