P238E code meaning
Water in Fuel Sensor B Circuit Intermittent
What P238E means
P238E is meant for a water-in-fuel sensor B circuit whose signal flickers or drops out for short periods instead of staying at one fault level. No manufacturer documents P238E publicly. The one published case for the same sensor explains well why such faults come and go: on 2022 Ram heavy-duty trucks Stellantis found water from road spray or pressure washing inside the plug of the frame-mounted filter, logged there as P238D. Moisture that evaporates, terminals that lose contact on rough roads and fuel sloshing over the probe can all produce brief changes. Since the sensor is a plain pair of electrodes, connector, pins and harness clips along the frame rail come first. P238C and P238D are the steady low and high faults.
P238E at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P238E
- Water-in-fuel lamp flickering or coming and going
- Fault not present when tested at the workshop
Common causes of P238E
- Most likelyMoisture entering and drying out in the connector
- PossibleLoose terminals losing contact on rough roads
- Less likelyBroken harness clips letting the wire rub on the frame
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 bWater in fuel wiring b
What each part of P238E 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. |
| 8E | The exact fault in that area. |
What to do next
- Note P238E 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 P238E
What does P238E mean?
P238E means "Water in Fuel Sensor B Circuit Intermittent". P238E is meant for a water-in-fuel sensor B circuit whose signal flickers or drops out for short periods instead of staying at one fault level. It is a generic code, so it means the same on every make.
Is it safe to drive with P238E?
P238E does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P238E fail an emissions test?
P238E 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 P238E to fix?
Difficulty: easy. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P238E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.