OBD-II code · Powertrain (generic, extended)
P238D Water in Fuel Sensor B Circuit High
Same as P238A 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 P238D?
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
- Easy
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.4–1.4 h
- Emissions test
- Usually unaffected
- Parts involved
- Water In Fuel Sensor B
Related codes
- P2267Water in Fuel Sensor A Circuit High
- P238AWater in Fuel Sensor B Circuit
- P238BWater in Fuel Sensor B Circuit Range or Performance
- P238CWater in Fuel Sensor B Circuit Low
- P238EWater in Fuel Sensor B Circuit Intermittent
- P238FWater in Fuel Condition Sensor B
- P2390Diesel Intake Air Flow B Control Circuit Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.