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.
1996 Buick Roadmaster BaseFACTORY OEM SERVICE PROCEDURE
Anti-Lock Brake System DTCS
ANTI-LOCK BRAKE SYSTEM DTCS
| OEM Code | Description |
|---|---|
| 21 | FRONT WHEEL SPEED SENSOR CIRCUIT FAULT |
| 23 | WHEEL SPEED SENSOR CONTINUITY FAULT |
| 25 | FRONT WHEEL SPEED SENSOR CIRCUIT FAULT |
| 27 | WHEEL SPEED SENSOR CONTINUITY FAULT |
| 28 | WHEEL SPEED SENSOR FREQUENCY ERROR |
| 35 | REAR WHEEL SPEED SENSOR CIRCUIT FAULT |
| 37 | WHEEL SPEED SENSOR CONTINUITY FAULT |
| 41 | RIGHT FRONT, LEFT FRONT & REAR INLET VALVE SOLENOID FAULT |
| 42 | RIGHT FRONT, LEFT FRONT & REAR OUTLET VALVE SOLENOID FAULT |
| 45 | RIGHT FRONT, LEFT FRONT & REAR INLET VALVE SOLENOID FAULT |
| 46 | RIGHT FRONT, LEFT FRONT & REAR OUTLET VALVE SOLENOID FAULT |
| 55 | RIGHT FRONT, LEFT FRONT & REAR INLET VALVE SOLENOID FAULT |
| 56 | RIGHT FRONT, LEFT FRONT & REAR OUTLET VALVE SOLENOID FAULT |
| 61 | BPM VALVE PUMP MOTOR FAULT |
| 63 | VALVE POWER SUPPLY FAULT |
| 71 | EBCM FAULT |
| 85 | LOW VOLTAGE |
Factory Service Tools
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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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