P28C3
EVAP System High Load Purge Line B Performance
The ECM detects insufficient flow or pressure in the high-load purge line B of the evaporative emissions system. Purge cannot be commanded effectively under high engine load.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Common causes
Ordered by how often each turns out to be the cause.
- Purge line B restricted or kinkedCommon
- Purge valve B partially openPossible
Parts involved
- EVAP Purge Valve B
- EVAP Purge Line B
- Intake Manifold
P28C3 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.