Brake Booster Temperature Sensor A Circuit Range/Performance
The booster temperature sensor reading is implausible relative to commanded assist or coolant temperature. The signal moves too slowly, sticks, or never reaches expected values during operation.
Affected components
- Electric brake booster
- Temperature sensor
Common causes
- Medium likelihood: Sensor drift or contamination on the temperature element
- Medium likelihood: Sensor not seated properly against the booster motor housing
- Low likelihood: Sensor element aged beyond calibration window
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
Related codes
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.