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Common ECU faults:
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Fault codes C1211 to C1788 (GM)

C1211 - ABS Indicator Lamp Circuit Malfunction
C1214 - System Relay Contact or Coil Circuit Open
C1217 - Pump Motor Shorted to Ground
C1218 - Pump Motor Circuit Shorted to Voltage or Motor Ground Open
C1221 - Left Front Wheel Speed Sensor Input Signal is 0
C1222 - Right Front Wheel Speed Sensor Input Signal is 0
C1223 - Left Rear Wheel Speed Sensor Input Signal is 0
C1224 - Right Rear Wheel Speed Sensor Input Signal is 0
C1225 - Left Front Excessive Wheel Speed Variation
C1226 - Right Front Excessive Wheel Speed Variation
C1227 - Left Rear Excessive Wheel Speed Variation
C1228 - Right Rear Excessive Wheel Speed Variation
C1232 - Left Front Wheel Speed Circuit Open or Shorted
C1233 - Right Front Wheel Speed Circuit Open or Shorted
C1234 - Left Rear Wheel Speed Circuit Open or Shorted
C1235 - Right Rear Wheel Speed Circuit Open or Shorted
C1236 - Low System Supply Voltage
C1237 - High System Supply Voltage
C1238 - Brake Thermal Model Exceeded
C1241 - Variable Effort Steering Circuit Malfunction
C1242 - Pump Motor Circuit Open
C1243 - BPMV Pump Motor Stalled
C1244 - Powertrain Indicated Engine Drag Control Malfunction
C1246 - Brake Lining Wear Circuit Open
C1248 - EBCM Turned the Red Brake Warning Indicator On
C1251 - RSS Indicated Malfunction
C1252 - Left Front Normal Force Malfunction
C1253 - Right Front Normal Force Malfunction
C1254 - Abnormal Shutdown Detected
C1255 - EBCM Internal Malfunction
C1256 - EBCM Internal Malfunction
C1261 - Left Front Inlet Valve Solenoid Malfunction
C1262 - Left Front Outlet Valve Solenoid Malfunction
C1263 - Right Front Inlet Valve Solenoid Malfunction
C1264 - Right Front Outlet Valve Solenoid Malfunction
C1265 - Left Rear Inlet Valve Solenoid Malfunction
C1266 - Left Rear Outlet Valve Solenoid Malfunction
C1267 - Right Rear Inlet Valve Solenoid Malfunction
C1268 - Right Rear Outlet Valve Solenoid Malfunction
C1271 - Left Front TCS Master Cylinder Isolation Valve Malfunction
C1272 - Left Front TCS Prime Valve Malfunction
C1273 - Right Front TCS Master Cylinder Isolation Valve Malfunction
C1274 - Right Front TCS Prime Valve Malfunction
C1276 - Delivered Torque Signal Circuit Malfunction
C1277 - Requested Torque Signal Circuit Malfunction
C1278 - TCS Temporarily Inhibited By PCM
C1281 - VSES Sensors Uncorrelated
C1282 - Yaw Rate Sensor Bias Circuit Malfunction
C1283 - Excessive Time to Center Steering
C1284 - Lateral Accelerometer Sensor Bias Malfunction
C1285 - Lateral Accelerometer Sensor Circuit Malfunction
C1286 - Steering Sensor Bias Malfunction
C1287 - Steering Sensor Rate Malfunction
C1288 - Steering Sensor Circuit Malfunction
C1291 - Open Brake Lamp Switch Contacts During Deceleration
C1292 - Brake Fluid Pressure Sensor Circuit
C1293 - Code C1291 Set in Previous Ignition Cycle
C1294 - Brake Lamp Switch Circuit Always Active
C1295 - Brake Lamp Switch Circuit Open
C1296 - Brake Fluid Pressure Sensor Circuit
C1297 - PCM Indicated Brake Extended Travel Switch Failure
C1298 - PCM Class 2 Serial Data Link Malfunction
C1326 - Battery Out of Range
C1650 - RSS Control Module Fault
C1658 - RSS Control Module Calibration Fault
C1710 - Left Front Damper Actuator Short Circuit to Battery
C1711 - Left Front Damper Actuator Short Circuit to Ground
C1712 - Left Front Damper Actuator Open Circuit
C1715 - Right Front Damper Actuator Short Circuit to Battery
C1716 - Right Front Damper Actuator Short Circuit to Ground
C1717 - Right Front Damper Actuator Open Circuit
C1720 - Left Rear Damper Actuator Short Circuit to Battery
C1721 - Left Rear Damper Actuator Short Circuit to Ground
C1722 - Left Rear Damper Actuator Open Circuit
C1725 - Right Rear Damper Actuator Short Circuit to Battery
C1726 - Right Rear Damper Actuator Short Circuit to Ground
C1727 - Right Rear Damper Actuator Open Circuit
C1735 - Compressor Relay Short to Battery
C1736 - Compressor Relay Short to GND/Open Circuit
C1737 - Exhaust Solenoid Valve Short to Battery
C1738 - Exhaust Solenoid Valve Short to GND
C1743 - Speed Signal Fault
C1744 - Lift/Dive Signal Discrete Fault
C1760 - Left Front Position Sensor Input Fault
C1761 - Right Front Position Sensor Input Fault
C1762 - Left Rear Position Sensor Input Fault
C1763 - Right Rear Position Sensor Input Fault
C1768 - Position Sensor Supply Fault
C1780 - Loss of Steering Position Signal
C1782 - ICCS2 DL Left Output Short Circuit to Bat
C1783 - ICCS2 DL Left Output Short Circuit to GND
C1784 - ICCS2 DL Right Output Short Circuit to Bat
C1785 - ICCS2 DL Right Output Short Circuit to GND
C1786 - Damper Control Relay Fault
C1787 - Damper Control Relay Short to GND
C1788 - Damper Control Relay Short to Bat

 

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