OBD-II code · Powertrain (generic, extended)
P237E Exhaust Heat Exchanger Bypass Valve A Control Circuit High
Same as P237C with the control line shorted to supply. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P237E?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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 Bypass Valve A, Exhaust Heat Recovery Actuator
Related codes
- P23A4Exhaust Heat Exchanger Bypass Valve B Control Circuit High
- P237BO2 Sensor Exhaust Sample Error Bank 2 Sensor 2
- P237CExhaust Heat Exchanger Bypass Valve A Control Circuit Open
- P237DExhaust Heat Exchanger Bypass Valve A Control Circuit Low
- P237FExhaust Heat Exchanger Bypass Valve A Control Performance
- P2380Wait to Start Lamp Control Circuit
- P2381EGR Sensor D Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.