Brake Booster Temperature Sensor A Circuit High
The booster temperature signal is above the upper diagnostic threshold. Common causes are an open sensor or a short to a 5 V reference in the harness.
Affected components
- Electric brake booster
- Temperature sensor
- Wiring harness
Common causes
- High likelihood: Open sensor element
- Medium likelihood: Sensor signal wire shorted to the 5 V reference
- Low likelihood: Connector pins corroded - high contact resistance
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.