P238CWater in Fuel Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- How the car detects it
- P238C is set when the signal line of water-in-fuel sensor B stays below its valid range. Because the sensor reads conductivity, anything that bridges its terminals or pulls the signal to ground can cause it: a chafed wire, a wet connector or a sensor body full of water. No manufacturer documents P238C publicly. For the matching sensor A code P2266 Ford bulletin 18-2133 on 2017–18 Super Duty 6.7L trucks traced the fault to water in connector C3080 and specified a sensor resistance of 795 to 815 kOhm across pins 1 and 2; on Ram trucks sensor B is the one in the chassis filter. Since a wet plug may imitate both a low circuit and real water, check for P238F as well. The opposite fault is P238D.
- What you may notice
- Water-in-fuel lamp on
- Fault appears after washing or rain
- Likely causes
- LikelyWater bridging the terminals in the sensor connector
- PossibleSignal wire chafed through to ground on the frame
- PossibleSensor resistance out of specification
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.