OBD-II code · Powertrain (generic, extended)
P23A2 Exhaust Heat Exchanger Bypass Valve B Control Circuit Open
Exhaust Heat Exchanger Bypass Valve B Control Circuit Open: the control circuit is open. Likely a broken wire, disconnected connector, or failed actuator.
Is it safe to drive with P23A2?
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 actuator
- Less likelyPin pushed back out of connector body
- Less likelyCracked solder joint inside the module or sensor
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 B
Related codes
- P237CExhaust Heat Exchanger Bypass Valve A Control Circuit Open
- P239FO2 Sensor Out of Range During Deceleration Bank 2 Sensor 2
- P23A0O2 Sensor Exhaust Sample Error Bank 1 Sensor 2
- P23A1O2 Sensor Exhaust Sample Error Bank 2 Sensor 2
- P23A3Exhaust Heat Exchanger Bypass Valve B Control Circuit Low
- P23A4Exhaust Heat Exchanger Bypass Valve B Control Circuit High
- P23A5Exhaust Heat Exchanger Bypass Valve B Control Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.