What does code P238B mean?

Q: What does code P238B mean?

Water in Fuel Sensor B Circuit Range or Performance. P238B indicates that the powertrain control module has detected an out-of-range or performance fault in the Water in Fuel Sensor B circuit, which monitors the fuel filter separator on diesel engines. The computer compares the sensor signal against expected values and flags the code when the voltage or rationality check falls outside the manufacturer's calibrated window.

DTC codes / P23xx · Ignition system and misfire / P238B

P238BWater in Fuel Sensor B Circuit Range or Performance

P238B indicates that the powertrain control module has detected an out-of-range or performance fault in the Water in Fuel Sensor B circuit, which monitors the fuel filter separator on diesel engines. The computer compares the sensor signal against expected values and flags the code when the voltage or rationality check falls outside the manufacturer's calibrated window.

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.