Brake Booster Temperature Sensor A Circuit
The temperature sensor monitoring the electric brake booster (iBooster, eBooster) returns no usable signal. Without temperature feedback the controller derates booster assist to protect the motor.
Affected components
- Electric brake booster
- Temperature sensor
- Wiring harness
Common causes
- High likelihood: Open sensor element or broken sensor wire
- Medium likelihood: Corroded connector on the booster sensor pigtail
Possible symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Diagnostic notes
- The malfunction indicator lamp may illuminate
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.