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 391 (ANTI-LOCK 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 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| 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 | LF Wheel Speed Sensor Input Signal is 0 |
| C1222 | RF Wheel Speed Sensor Input Signal is 0 |
| C1223 | LR Wheel Speed Sensor Input Signal is 0 |
| C1224 | RR Wheel Speed Sensor Input Signal is 0 |
| C1225 | LF Excessive Wheel Speed Variation |
| C1226 | RF Excessive Wheel Speed Variation |
| C1227 | LR Excessive Wheel Speed Variation |
| C1228 | RR Excessive Wheel Speed Variation |
| C1232 | LF Wheel Speed Circuit Open or Shorted |
| C1233 | RF Wheel Speed Circuit Open or Shorted |
| C1234 | LR Wheel Speed Circuit Open or Shorted |
| C1235 | RR Wheel Speed Circuit Open or Shorted |
| C1236 | Low System Supply Voltage |
| C1237 | High System Supply Voltage |
| C1238 | Brake Thermal Model Exceeded (With NW9) |
| C1242 | Pump Motor Circuit Open |
| C1243 | BPMV Pump Motor Stalled |
| C1248 | EBCM Turned the Red Brake Warning Indicator On |
| C1254 | Abnormal Shutdown Detected |
| C1255 | EBCM Internal Malfunction |
| C1256 | EBCM Internal Malfunction |
| C1261 | LF Inlet Valve Solenoid Malfunction |
| C1262 | LF Outlet Valve Solenoid Malfunction |
| C1263 | RF Inlet Valve Solenoid Malfunction |
| C1264 | RF Outlet Valve Solenoid Malfunction |
| C1265 | LR Inlet Valve Solenoid Malfunction |
| C1266 | LR Outlet Valve Solenoid Malfunction |
| C1267 | RR Inlet Valve Solenoid Malfunction |
| C1268 | RR Outlet Valve Solenoid Malfunction |
| C1271 | LF TCS Master Cylinder Isolation Valve Malfunction |
| C1272 | LF TCS Prime Valve Malfunction |
| C1273 | RF TCS Master Cylinder Isolation Valve Malfunction |
| C1274 | RF TCS Prime Valve Malfunction |
| C1276 | Delivered Torque Signal Circuit Malfunction |
| C1277 | Requested Torque Signal Malfunction |
| C1278 | TCS Temporarily Inhibited By PCM (W/NW9) |
| C1281 | VSES Sensors Uncorrelated |
| C1283 | Excessive Time to Center Steering |
| C1286 | Steering Sensor Bias Malfunction (W/JL4) |
| C1282 | Yaw Rate Sensor Bias Circuit Malfunction (W/JL4) |
| C1284 | Lateral Accelerometer Sensor Bias Malfunction |
| C1285 | Lateral Accelerometer Sensor Circuit Malfunction (W/JL4) |
| C1287 | Steering Sensor Rate Malfunction |
| C1288 | Steering Sensor Circuit Malfunction (W/JL4) |
| C1291 | Open Brake Lamp Switch Contacts During Deceleration |
| C1293 | Code C1291 Set in Previous Ignition Cycle (W/NW9) |
| C1294 | Brake Lamp Switch Circuit Always Active (W/NW9) |
| C1295 | Brake Lamp Switch Circuit Open |
| P1571 | TCS PWM Circuit No Frequency (W/NW9) |
| P1644 | Delivered Torque Output Circuit |
| P1689 | Traction Control Delivered Torque Control Circuit (W/NW9) |
RENDER: 1.0x
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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.