Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code (DTC) List
Diagnostic Trouble Code (DTC) List
| DTC | Description | Module(s) |
|---|---|---|
| DTC C1214 | System Relay Contact or Coil Circuit Open | EBCM |
| DTC C1216 | Brake Control Relay Coil Circuit Open | EBCM |
| DTC C1217 | Pump Motor Shorted to Ground | EBCM |
| DTC C1218 | Pump Motor Circuit Shorted to Voltage or Motor Ground Open | EBCM |
| DTC C1221 | Left Front Wheel Speed Sensor Input Signal is 0 | EBCM |
| DTC C1222 | Right Front Wheel Speed Sensor Input Signal is 0 | EBCM |
| DTC C1223 | Left Rear Wheel Speed Sensor Input Signal is 0 | EBCM |
| DTC C1224 | Right Rear Wheel Speed Sensor Input Signal is 0 | EBCM |
| DTC C1225 | Left Front Excessive Wheel Speed Variation | EBCM |
| DTC C1226 | Right Front Excessive Wheel Speed Variation | EBCM |
| DTC C1227 | Left Rear Excessive Wheel Speed Variation | EBCM |
| DTC C1228 | Right Rear Excessive Wheel Speed Variation | EBCM |
| DTC C1232 | Left Front Wheel Speed Circuit Open or Shorted | EBCM |
| DTC C1233 | Right Front Wheel Speed Circuit Open or Shorted | EBCM |
| DTC C1234 | Left Rear Wheel Speed Circuit Open or Shorted | EBCM |
| DTC C1235 | Right Rear Wheel Speed Circuit Open or Shorted | EBCM |
| DTC C1236 | Low System Supply Voltage | EBCM |
| DTC C1237 | High System Supply Voltage | EBCM |
| DTC C1238 | Brake Thermal Model Exceeded | EBCM |
| DTC C1242 | Pump Motor Circuit Open | EBCM |
| DTC C1243 | BPMV Pump Motor Stalled | EBCM |
| DTC C1247 | Brake Pressure Differential Switch Activated | EBCM |
| DTC C1248 | EBCM Turned the Red Brake Warning Indicator On | EBCM |
| DTC C1254 | Abnormal Shutdown Detected | EBCM |
| DTC C1255 | EBCM Internal Malfunction | EBCM |
| DTC C1256 | EBCM Internal Malfunction | EBCM |
| DTC C1261 | Left Front Inlet Valve Solenoid Malfunction | EBCM |
| DTC C1262 | Left Front Outlet Valve Solenoid Malfunction | EBCM |
| DTC C1263 | Right Front Inlet Valve Solenoid Malfunction | EBCM |
| DTC C1264 | Right Front Outlet Valve Solenoid Malfunction | EBCM |
| DTC C1265 | Left Rear Inlet Valve Solenoid Malfunction | EBCM |
| DTC C1266 | Left Rear Outlet Valve Solenoid Malfunction | EBCM |
| DTC C1267 | Right Rear Inlet Valve Solenoid Malfunction | EBCM |
| DTC C1268 | Right Rear Outlet Valve Solenoid Malfunction | EBCM |
| DTC C1271 | Left Front TCS Master Cylinder Isolation Valve Malfunction | EBCM |
| DTC C1272 | Left Front TCS Prime Valve Malfunction | EBCM |
| DTC C1273 | Right Front TCS Master Cylinder Isolation Valve Malfunction | EBCM |
| DTC C1274 | Right Front TCS Prime Valve Malfunction | EBCM |
| DTC C1276 | Delivered Torque Signal Circuit Malfunction | PCM |
| DTC C1277 | Requested Torque Signal Circuit Malfunction | PCM |
| DTC C1278 | TCS Temporarily Inhibited By PCM | EBCM |
| DTC C1291 | Open Brake Lamp Switch Contacts During Deceleration | EBCM |
| DTC C1294 | Brake Lamp Switch Circuit Always Active | EBCM |
| DTC C1295 | Brake Lamp Switch Circuit Open | EBCM |
| DTC P1571 | Traction Control Torque Request Circuit | PCM |
| DTC P1644 | Traction Control Delivered Torque Output Circuit | PCM |
| DTC P1689 | Traction Control Delivered Torque Output Circuit | PCM |
| Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Scan Tool Does Not Communicate with Class 2 Device | EBCM |
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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