Intake Air Heater B Circuit High
Voltage on the secondary intake air heater control line is above the expected window. Typical causes are a short to battery or an open relay coil.
Affected components
- Intake air heater b
- Heater relay
- Wiring harness
Common causes
- High likelihood: Control wire shorted to a B+ supply
- Medium likelihood: Open relay coil
- Low likelihood: Connector pins corroded - high contact resistance
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.