Powertrain
generic / SAE
P23A2
Exhaust Heat Exchanger Bypass Valve B Control Circuit Open
An open circuit is detected on the control line for the bypass flap A of the exhaust heat exchanger. This valve directs exhaust either through the heat exchanger (cold start, fast warm-up) or around it (normal operation). Without working control the warm-up strategy is impaired and emissions during cold start increase.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / A2
Possible causes
- Open in harness or actuator high
- Pin pushed back out of connector body low
- Cracked solder joint inside the module or sensor low
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–700 €
- Estimated time: 1–2.5 h
- Component: exhaust bypass valve b
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012