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.
Possible Causes
| POSSIBLE CAUSES |
|---|
| 5-VOLT SUPPLY CIRCUIT OPEN OR SHORTED TO GROUND |
| BPP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE (CIRCUIT HIGH) |
| BPP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND (CIRCUIT LOW) |
| BPP SENSOR SIGNAL CIRCUIT OPEN/HIGH RESISTANCE (CIRCUIT LOW) |
| BPP SENSOR GROUND CIRCUIT OPEN/HIGH RESISTANCE (CIRCUIT LOW) |
| FAULTY BRAKE PEDAL POSITION SENSOR |
| FAULTY BRAKE SYSTEM MODULE (BSM) |
The (C053D, C10F5, U0418) performance and implausible/lost message faults can set for any of the following:
| POSSIBLE CAUSES |
|---|
| FAULTY HYDRAULIC ASSEMBLY (BPP AND BRAKE SIMULATOR SENSORS ARE INTERNAL) |
| FAULTY BRAKE SYSTEM MODULE (BSM) |
The (U0121, U0129) Loss of Communication faults can set for any of the following:
| POSSIBLE CAUSES |
|---|
| BATTERY OR IGNITION SUPPLY TO BSM OPEN OR SHORTED TO GROUND |
| BSM GROUND CIRCUIT OPEN/HIGH RESISTANCE |
| BSM CAN BUS CIRCUITS SHORTED TO VOLTAGE |
| BSM CAN BUS CIRCUITS SHORTED TO GROUND |
| BSM CAN BUS CIRCUITS OPEN/HIGH RESISTANCE |
| FAULTY BRAKE SYSTEM CONTROL MODULE (BSCM) |
The Wheel Speed Sensor faults can set for any of the following:
| POSSIBLE CAUSES |
|---|
| SNA OR ERROR MESSAGE FROM BSCM |
| WSS SIGNAL CIRCUITS SHORTED TO VOLTAGE |
| WSS SIGNAL CIRCUITS SHORTED TO GROUND |
| WSS SIGNAL CIRCUITS OPEN/HIGH RESISTANCE |
| WSS GROUND CIRCUIT OPEN/HIGH RESISTANCE |
| DAMAGED TONE WHEEL |
| FAULTY WHEEL SPEED SENSOR |
| FAULTY BRAKE SYSTEM CONTROL MODULE (BSCM) |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.