P02E4
Diesel Intake Air Flow A Control Stuck Open
Diesel intake throttle A is mechanically stuck open — anti-shudder function on shutdown will not work and DPF regen airflow control is lost.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Carbon buildup or broken return springCommon
- Carbon or debris buildup preventing free movementLess likely
- Component wear with age - mechanical playLess likely
Parts involved
- Diesel Intake Throttle
P02E4 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.