OBD-II code · Powertrain (generic, extended)
P237C Exhaust Heat Exchanger Bypass Valve A Control Circuit Open
Exhaust Heat Exchanger Bypass Valve A Control Circuit Open: the control circuit is open. Likely a broken wire, disconnected connector, or failed actuator.
Is it safe to drive with P237C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen in harness or connector
- PossibleActuator solenoid or motor winding open
- Less likelyPin pushed back out of connector body
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Exhaust Heat Exchanger, Exhaust Bypass Valve A, Exhaust Heat Recovery Actuator
Related codes
- P23A2Exhaust Heat Exchanger Bypass Valve B Control Circuit Open
- P2379O2 Sensor Out of Range During Deceleration Bank 2 Sensor 2
- P237AO2 Sensor Exhaust Sample Error Bank 1 Sensor 2
- P237BO2 Sensor Exhaust Sample Error Bank 2 Sensor 2
- P237DExhaust Heat Exchanger Bypass Valve A Control Circuit Low
- P237EExhaust Heat Exchanger Bypass Valve A Control Circuit High
- P237FExhaust Heat Exchanger Bypass Valve A Control Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.