Intake Air Heater A Circuit High
Intake Air Heater A Circuit High: the signal voltage is above the expected range. Used on diesel and some petrol engines for cold-start emissions and starting reliability.
Affected components
- Intake air heater
- Heater wiring
Common causes
- High likelihood: Circuit shorted to power
- Medium likelihood: Ground open
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.