What does code P238A mean?

Q: What does code P238A mean?

Water in Fuel Sensor B Circuit. P238A indicates that the powertrain control module (PCM) has detected an abnormal condition in the electrical circuit for Water in Fuel Sensor B, which is typically the second sensor in a dual-filter system or a secondary sensor in a single filter. The PCM monitors the sensor's signal voltage and sets this code when the voltage falls outside the expected range for the current fuel conditions, indicating a circuit fault rather than directly confirming water presence.

DTC codes / P23xx · Ignition system and misfire / P238A

P238AWater in Fuel Sensor B Circuit

P238A indicates that the powertrain control module (PCM) has detected an abnormal condition in the electrical circuit for Water in Fuel Sensor B, which is typically the second sensor in a dual-filter system or a secondary sensor in a single filter. The PCM monitors the sensor's signal voltage and sets this code when the voltage falls outside the expected range for the current fuel conditions, indicating a circuit fault rather than directly confirming water presence.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.