# Service bulletin PIP\-4714

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10032451
- Published by NHTSA: 2010\-03\-26
- Manufacturer's number: PIP\-4714
- Manufacturer's date: 2009\-10\-01
- NHTSA component: ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

## NHTSA's 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. \*PE

## The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

## Components

Electrical system, Alternator

## Trouble codes named

P0621

## Vehicles listed

- 2009 CHEVROLET EXPRESS
- 2009 GMC SAVANA

## Other bulletins for the same vehicles and component

- [PI1404](/bulletins/10113512.md), 2017-08-15, Service bulletin: ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR. This preliminary informational bulletin provides a diagnostic tip for low line pressure or pressure regulator valve stuck after transmission service pump cover replacement.

JSON: [/v1/bulletins/10032451](/v1/bulletins/10032451)

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