P053D
PCV Heater A Performance
The PCV heater on path A is electrically intact but does not deliver the expected thermal effect - hose temperature does not rise as commanded. Heater element aged or contact resistance increased.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: easy
Common causes
Ordered by how often each turns out to be the cause.
- Heater element agedCommon
Parts involved
- PCV Heater A
P053D 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.