OBD-II code · Powertrain (generic, extended)
P2605 Intake Air Heater B Circuit / Open
The controller cannot drive the secondary intake air heater (heater grid B) used on diesel engines for cold-start support. The grid stays cold so cold-start emissions and white smoke increase.
Is it safe to drive with P2605?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen heater grid element
- PossibleFailed heater relay or open coil
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.8–2.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Intake Air Heater B, Heater Relay, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.