Intake Air Heater B Circuit Range/Performance
The secondary intake air heater current does not match expected resistance. Either the grid is partially open or the relay contacts have high resistance.
Affected components
- Intake air heater b
- Heater relay
Common causes
- High likelihood: Partial element failure raises grid resistance
- Medium likelihood: Burned relay contacts
- Low likelihood: Sensor element aged beyond calibration window
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.