P2606
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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Partial element failure raises grid resistanceCommon
- Burned relay contactsPossible
- Sensor element aged beyond calibration windowLess likely
Parts involved
- Intake Air Heater B
- Heater Relay
P2606 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.