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.
Pinpoint Test Co: Electric Brake Booster (Ebb) Unit Internal Failure: Notes
Normal Operation and Fault Conditions
The EBB contains several hydraulic valves, hydraulic pressure sensors, a linear actuator and a pump motor. These components work in conjunction to provide the force necessary to bring the vehicle to a stop. The ABS module monitors these components for internal faults. If a fault occurs which impacts the base braking system, the ABS module sets one or more Diagnostic Trouble Codes (DTCs) and illuminates the red brake warning indicator.
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS C0047:01 | Brake Booster Pressure Sensor: General Electrical Failure | Sets due to an internal failure of the brake pressure sensor. |
| ABS C0047:1C | Brake Booster Pressure Sensor: Circuit Voltage Out Of Range | This DTC sets when a higher or lower than expected pressure sensor voltage which is detected within the EBB unit. |
| ABS C0047:31 | Brake Booster Pressure Sensor: No Signal | Sets when the ABS module no longer receives any signals from the pressure sensor. |
| ABS C0047:64 | Brake Booster Pressure Sensor: Signal Plausibility Failure | This DTC sets when a pressure sensor reading that does not match what is expected is detected within the EBB unit. |
| ABS C1013:09 | Brake System Pressure: Component Failures | This DTC sets when an internal component failure is detected within the EBB unit. |
| ABS C1013:7A | Brake System Pressure: Fluid Leak Or Seal Failure | This DTC sets when a loss of brake fluid pressure is detected within the brake system. |
| ABS C1013:92 | Brake System Pressure: Performance Or Incorrect Operation | This DTC sets when a loss of brake pressure or excessive brake pressure is detected within the brake system. |
Possible Sources
- Air trapped in the hydraulic system
- External brake system leak
- Internal EBB unit leak
- EBB unit internal failure
NO RELATED
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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.