P2607
Intake Air Heater B Circuit Low
Voltage on the secondary intake air heater control line is below the expected window. Usually a short to ground or a shorted relay coil.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Control wire shorted to groundCommon
- Internal short in relay coilPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Intake Air Heater B
- Heater Relay
- Wiring Harness
P2607 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.