GM Service Manual Online
For 1990-2009 cars only

DTC Number/Description

DTC C1211 Valve Supply Voltage Interruption

DTC C1215 Suspect Valve Malfunction

DTC C1221 RF Wheel Speed Sensor Circuit Open or Shorted

DTC C1222 RF Wheel Speed Sensor Signal Intermittent

DTC C1223 RF Wheel Speed Sensor Signal Missing

DTC C1225 LF Wheel Speed Sensor Circuit Open or Shorted

DTC C1226 LF Wheel Speed Sensor Signal Intermittent

DTC C1227 LF Wheel Speed Sensor Signal Missing

DTC C1231 RR Wheel Speed Sensor Circuit Open or Shorted

DTC C1232 RR Wheel Speed Sensor Signal Intermittent

DTC C1233 RR Wheel Speed Sensor Signal Missing

DTC C1235 LR Wheel Speed Sensor Circuit Open or Shorted

DTC C1236 LR Wheel Speed Sensor Signal Intermittent

DTC C1237 LR Wheel Speed Sensor Signal Missing

DTC C1241 RF Inlet Valve Circuit Malfunction

DTC C1242 RF Outlet Valve Circuit Malfunction

DTC C1244 RF Isolation Valve Circuit Malfunction

DTC C1245 LF Inlet Valve Circuit Malfunction

DTC C1246 LF Outlet Valve Circuit Malfunction

DTC C1248 LF Isolation Valve Circuit Malfunction

DTC C1251 RR Inlet Valve Circuit Malfunction

DTC C1252 RR Outlet Valve Circuit Malfunction

DTC C1255 LR Inlet Valve Circuit Malfunction

DTC C1256 LR Outlet Valve Circuit Malfunction

DTC C1261 Pump Motor Run Malfunction

DTC C1262 Pump Pressure Malfunction During ABS Stop

DTC C1271 EBCM/EBTCM Internal Malfunction

DTC C1272 Brake Travel Switch Circuit Malfunction

DTC C1273 BPMV Fluid Level Switch Circuit Malfunction

DTC C1274 BPMV Pressure Switch Circuit Malfunction

DTC C1275 PCM Requested TCS to Be Disabled

DTC C1276 Serial Data Malfunction

DTC C1277 Delivered Torque Signal Circuit Malfunction

DTC C1278 Requested Torque Signal Circuit Malfunction

DTC C1281 Brake Thermal Model Limit Exceeded