P2B98
Exhaust Pressure Control Valve A Supply Low
The supply voltage to the exhaust pressure control valve A actuator is below the expected window. Fuse blown, supply wire shorted, or upstream regulator fault.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Supply fuse blownCommon
- Supply wire shorted to groundPossible
Parts involved
- Exhaust Pressure Control Valve A
- Wiring Harness
P2B98 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.