OBD-II code · Powertrain (generic, extended)
P2608 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.
Is it safe to drive with P2608?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl wire shorted to a B+ supply
- PossibleOpen relay coil
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–2 h
- Emissions test
- Usually unaffected
- Parts involved
- Intake Air Heater B, Heater Relay, Wiring Harness
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.