OBD-II code · Powertrain (generic, extended)
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.
Is it safe to drive with P28C3?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPurge line B restricted or kinked
- PossiblePurge valve B partially open
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Evap Purge Valve B, Evap Purge Line B, Intake Manifold
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.