Powertrain
Definition only
Lights the check engine lamp
P238B: Water in Fuel Sensor B Circuit Range or Performance
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P238B mean?
Same as P238A with the signal in plausible range yet not matching the engine model.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Sensor element drifted
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P238B on the same make and model first.
P238B in the community
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