OBD-II code · Powertrain (generic, extended)
P2399 Diesel Intake Air Flow B Position Sensor Circuit High
Same as P2396 with the signal voltage above the plausible range. 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 P2399?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.8–2 h
- Emissions test
- Likely to fail
- Parts involved
- Diesel Intake Air Flow B Position Sensor
Related codes
- P02E9Diesel Intake Air Flow A Position Sensor Circuit High
- P2396Diesel Intake Air Flow B Position Sensor Circuit
- P2397Diesel Intake Air Flow B Position Sensor Range or Performance
- P2398Diesel Intake Air Flow B Position Sensor Circuit Low
- P239ADiesel Intake Air Flow B Position Sensor Circuit Intermittent or Erratic
- P239BDiesel Intake Air Flow B Control Motor Current Range or Performance
- P239CDiesel Intake Air Flow B Control System High Air Flow Detected
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.