GM OBD Trouble Codes

Note: See this page for generic OBD-II codes (they start with P0XXX).

See also: Chevy Check Engine Light @ Check-Engine-Light.com and Chevrolet OBD-II Codes section

Introduction

GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation). There are some variations among imports such as the Cadillac Catera, which is a German Opel derivative, the Catera uses the European ISO 9141 protocol.

The codes here are generally apply to all OBD-II GM vehicles: GMC, Chevrolet, Buick, Oldsmobile, Cadillac, Pontiac, Saturn.

Content

• GM Driving Cycle
• GM B Body Codes
• GM C Chassis Codes
• GM U Network Codes