P28C3

EVAP System High Load Purge Line B Performance

Moderate severity

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.

Common causes

Purge line B restricted or kinked
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $90-440
Purge valve B partially open
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $90-440
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P28C3 mean?

P28C3 means "EVAP System High Load Purge Line B Performance". It is a generic OBD-II code that points to a fault in the auxiliary emission controls.

What are the most common causes of P28C3?

purge line b restricted or kinked; purge valve b partially open — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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