OBD-II code · Powertrain (generic, extended)
P2392 Diesel Intake Air Flow B Control Circuit Low
Same as P2390 with the control line shorted to ground. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P2392?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Diesel Intake Air Flow B
Related codes
- P02E2Diesel Intake Air Flow A Control Circuit Low
- P238FWater in Fuel Condition Sensor B
- P2390Diesel Intake Air Flow B Control Circuit Open
- P2391Diesel Intake Air Flow B Control Performance
- P2393Diesel Intake Air Flow B Control Circuit High
- P2394Diesel Intake Air Flow B Control Stuck Open
- P2395Diesel Intake Air Flow B Control Stuck Closed
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.