What does code P237D mean?

Q: What does code P237D mean?

Exhaust Heat Exchanger Bypass Valve A Control Circuit Low. P237D indicates that the powertrain control module has detected an abnormally low voltage on the control circuit for the exhaust heat exchanger bypass valve 'A'. This valve routes exhaust gas around the heat exchanger to manage exhaust temperature and cabin heating, and a low circuit condition means the computer cannot reliably command the valve to move.

DTC codes / P23xx · Ignition system and misfire / P237D

P237DExhaust Heat Exchanger Bypass Valve A Control Circuit Low

P237D indicates that the powertrain control module has detected an abnormally low voltage on the control circuit for the exhaust heat exchanger bypass valve 'A'. This valve routes exhaust gas around the heat exchanger to manage exhaust temperature and cabin heating, and a low circuit condition means the computer cannot reliably command the valve to move.

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.