P238DWater in Fuel Sensor B Circuit High
- Generic OBD-II code · Powertrain
- How the car detects it
- P238D reports that the signal of water-in-fuel sensor B sits above its valid range, usually from an open circuit, a disconnected sensor or a short to voltage. Stellantis case file S2214000004 documents it for 2022 Ram 2500, 3500, 4500 and 5500 trucks: the water warning lamp or message comes on at low mileage, and the cause is water that a pressure washer or similar spray drove into the plug of the filter housing on the frame rail. Technicians inspect both connector halves; corrosion means replacing filter housing and harness connector, plain water means drying, dielectric grease and a retest, with a new housing if the code returns. Stellantis stresses that P238D is not P238F, which reports actual water. P238C is the low counterpart.
- What you may notice
- Water-in-fuel lamp or message on at low mileage
- No water found when draining
- Likely causes
- LikelySpray water in the connector at the chassis-mounted fuel filter
- PossibleCorroded terminals on harness or filter housing side
- PossibleSensor in the filter housing failed
- RareOpen signal or ground wire
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.