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 Pontiac Sunfire AutomaticFACTORY OEM SERVICE PROCEDURE
Antilock Brake System
- Specifications
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point-Antilock Brake System
- Diagnostic System Check - ABS
- Scan Tool Output Controls
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- Enhanced Diagnostics
- Diagnostic Strategy
- 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 To C1235: Left Front Wheel Speed Sensor Input Signal is 0
- DTC C1236: Low System Supply Voltage
- DTC C1237: High System Supply Voltage
- DTC C1242 or C1243: BPMV Pump Motor Circuit
- DTC C1254: Abnormal Shutdown Detected
- DTC C1255 or C1256: EBCM Internal Malfunction
- DTC C1261 To C1268: Valve Solenoid Malfunction
- DTC C1275: PCM Requested ETS to Be Disabled
- DTC C1278: TCS Temporarily Inhibited By PCM
- DTC C1295: Brake Lamp Switch Circuit Open
- Symptoms - Antilock Brake System
- ABS Indicator Always On
- ABS Indicator Inoperative
- Traction Off Indicator Always On
- Traction Off Indicator Inoperative
- Repair Instructions
- Description and Operation
- Special Tools and Equipment
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.