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.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 629 (ANTILOCK BRAKE SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC TROUBLE CODE (DTC) LIST
1999 GMC Forward Control 5.7 R, Automatic
Diagnostic Trouble Code (DTC) List
1999 GMC Forward Control 5.7 R, AutomaticSECTION Diagnostic Trouble Code (DTC) List
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Diagnostic Trouble Code (DTC) List
| DTC | Description |
|---|---|
| DTC B2597 | Traction Control System Switch Circuit |
| DTC C1214 | System Relay Contact or Coil Circuit Open |
| DTC C1217 | Pump Motor Shorted to Ground |
| DTC C1218 | Pump Motor Circuit Shorted to Voltage or Motor Ground Open |
| DTC C1221, C1222, C1223, C1224, C1225, C1226, C1227, C1228, C1232, C1233, C1234, C1235 | Wheel Speed Sensor |
| DTC C1236 | Low System Supply Voltage |
| DTC C1237 | High System Supply Voltage |
| DTC C1242, C1243 | BPMV Pump Motor Circuit |
| DTC C1248 | EBCM Turned the Red Brake Warning Indicator On |
| DTC C1254 | Abnormal Shutdown Detected |
| DTC C1255, C1256 | EBCM Internal Malfunction |
| DTC C1261, C1262, C1263, C1264, C1265, C1266, C1267, C1268, C1271, C1272, C1273, C1274 | ABS Actuator Solenoid Fault |
| DTC C1276, P1644, P1689 | Delivered Torque Signal Circuit Malfunction |
| DTC C1277, P1571 | Requested Torque Signal Circuit Malfunction |
| DTC C1278 | TCS Temporarily Inhibited By PCM |
| DTC C1281, C1283, C1286 | Steering Sensor Circuit Malfunction |
| DTC C1282 | Yaw Rate Sensor Bias Circuit Malfunction |
| DTC C1284, C1285 | Lateral Accelerometer Sensor Circuit Malfunction |
| DTC C1287, C1288 | Steering Sensor Circuit Malfunction |
| DTC C1291 | Open Brake Lamp Switch Contacts During Deceleration |
| DTC C1292, C1293, C1296 | Brake Fluid Pressure Sensor Circuit |
| DTC C1294 | Brake Lamp Switch Circuit Always Active |
| DTC C1295 | Brake Lamp Switch Circuit Open |
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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.