P23A5
Exhaust Heat Exchanger Bypass Valve B Control Performance
Exhaust Heat Exchanger Bypass Valve B Control Performance: the component is electrically intact but its response does not match the command.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Flap stuck due to soot or carbonCommon
Parts involved
- Exhaust Bypass Valve B
P23A5 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.