What does code P237C mean?

Q: What does code P237C mean?

Exhaust Heat Exchanger Bypass Valve A Control Circuit Open. P237C indicates that the powertrain control module (PCM) has detected an open circuit in the control circuit for the exhaust heat exchanger bypass valve 'A'. This valve routes exhaust gas through a heat exchanger to warm the engine coolant faster, and an open circuit means the PCM cannot command the valve to move, which may affect warm-up efficiency and emissions.

DTC codes / P23xx · Ignition system and misfire / P237C

P237CExhaust Heat Exchanger Bypass Valve A Control Circuit Open

P237C indicates that the powertrain control module (PCM) has detected an open circuit in the control circuit for the exhaust heat exchanger bypass valve 'A'. This valve routes exhaust gas through a heat exchanger to warm the engine coolant faster, and an open circuit means the PCM cannot command the valve to move, which may affect warm-up efficiency and emissions.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

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.