The OBD-II DTC codes here generally apply to all OBD-II GM vehicles from 1996 and newer: GMC, Chevrolet, Buick, Cadillac, and former brands Oldsmobile, Pontiac, and Saturn.

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 …

The OBD-II "B" body-related diagnostic codes here generally apply to all OBD-II GM vehicles from 1996 and newer: GMC, Chevrolet, Buick, Cadillac, and former brands Oldsmobile, Pontiac, …

The first time the codes were 1684 & P0456, we changed the gas cap to a new one and had the codes reset. The second time was 2 days later, the codes were again 1684...

GM U Network OBD Trouble Codes Note: See this page for generic OBD codes (they start with P0XXX). Go back to the GM OBD Codes main page. DTC U1000 Class 2 Communication …

This list contains standard diagnostic trouble codes (DTC's) that are used by all manufacturers to identify vehicle problems. The codes provide below are generic codes that may not apply to all …

I have a 2011 Silverado 1500 LTZ V8 4 Wheel Drive 5.3 L and I have been chasing around this service stabiltrak and service traction control along with engine power reduced with code 2138.

Go back to the GM OBD Codes main page. A complete driving cycle will perform diagnostics on all monitored systems and can usually be completed in less than fifteen minutes.

In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids. Next, proceed to our listing of GM 2-digit trouble codes to lookup what the codes …

Information on diagnosing and repairing a vehicle DTC trouble code P0446 which is EVAP emission control system incorrect purge flow.