Powertrain
Definition only
Lights the check engine lamp
P237C: Exhaust Heat Exchanger Bypass Valve A Control Circuit Open
Standardized SAE J2012 code · P23xx — Ignition system and misfire
What does P237C mean?
Exhaust Heat Exchanger Bypass Valve A Control Circuit Open: the control circuit is open. Likely a broken wire, disconnected connector, or failed actuator.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
Common causes
- High Open in harness or connector
- Medium Actuator solenoid or motor winding open
- Low Pin pushed back out of connector body
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P237C on the same make and model first.
P237C in the community
Ask about P237CNo one has posted about P237C yet
Share your vehicle, the tool you used and what you tested — the first thread helps everyone who searches for this code.
Describe your P237C problem