What does code P23A5 mean?

Q: What does code P23A5 mean?

Exhaust Heat Exchanger Bypass Valve B Control Performance. P23A5 indicates that the powertrain control module has detected a performance fault in the bypass valve that controls exhaust flow through the heat exchanger circuit. The computer commands the valve to a specific position and monitors the resulting change in exhaust temperature or pressure; when the response falls outside the expected range, it stores this code.

DTC codes / P23xx · Ignition system and misfire / P23A5

P23A5Exhaust Heat Exchanger Bypass Valve B Control Performance

P23A5 indicates that the powertrain control module has detected a performance fault in the bypass valve that controls exhaust flow through the heat exchanger circuit. The computer commands the valve to a specific position and monitors the resulting change in exhaust temperature or pressure; when the response falls outside the expected range, it stores this code.

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.