P238D code meaning
Water in Fuel Sensor B Circuit High
What P238D means
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.
P238D at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P238D
- Water-in-fuel lamp or message on at low mileage
- No water found when draining
Common causes of P238D
- Most 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
- Less likelyOpen signal or ground wire
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Water in fuel sensor b
What each part of P238D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 8D | The exact fault in that area. |
What to do next
- Note P238D and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P238D
What does P238D mean?
P238D means "Water in Fuel Sensor B Circuit High". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P238D?
P238D does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P238D fail an emissions test?
P238D is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P238D to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P238D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.