Powertrain
generic / SAE
P237D
Exhaust Heat Exchanger Bypass Valve A Control Circuit Low
Same as P237C with the control line shorted to ground. 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.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / 7D
Possible causes
- Control line shorted to ground high
- Connector pins corroded - high contact resistance low
- Harness chafing through insulation low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–700 €
- Estimated time: 1–2.5 h
- Component: exhaust bypass valve a
- Component: exhaust heat recovery actuator
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012