GM Service Manual Online
For 1990-2009 cars only

DTC Number/Description

DTC C0221 - C0227 Wheel Speed Sensor Circuit Malfunction

DTC C0229 or C029 Drop Out of Front Wheel Speed Signals

DTC C0235 or C035 Rear Wheel Speed Signal Circuit Open

DTC C0236 or C036 Rear Wheel Speed Signal Circuit Missing

DTC C0237 or C037 Rear Wheel Speed Signal Erratic

DTC C0238 or C038 Wheel Speed Mismatch

DTC C0241-C0254 or C041-C054 EBCM Control Valve Circuit

DTC C0265 or C0266 and C065 C066 EBCM Relay Circuit

DTC C0267 or C0268 and C067 or C068 Pump Motor Circuit Open/Shorted

DTC C0269 or C0274 and C069 or C074 Excessive Dump/Isolation Time

DTC C0271-C0273, C0284 EBCM Malfunction

DTC C0279 Powertrain Configuration Not Valid

DTC C0281 or C081 Brake Switch Circuit

DTC C0283 Traction Switch Shorted to Ground

DTC C0287 Delivered Torque Signal Malfunction

DTC C0292 Lost Communication with Engine Control System

DTC C0297 Powertrain Configuration Data Not Received

DTC C0298 Powertrain Control Malfunction