Intake Air Heater System Performance
The intake air heater system did not raise intake temperature by the expected amount during cold-start support. Suggests low current draw, poor connection to the grid, or a failed temperature feedback path.
Affected components
- Intake air heater
- Intake air temperature sensor
- Heater relay
Common causes
- High likelihood: High-resistance battery feed to the heater
- Medium likelihood: Intake air temperature sensor reads with offset
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
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.