P2CBB
Fan 3 Underspeed
Cooling fan 3 runs below the calibrated minimum speed for the commanded duty. Mechanical resistance high or motor weakened.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Fan motor bearing wornCommon
- Supply voltage low under loadPossible
Parts involved
- Cooling Fan 3
P2CBB 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.