P0C74
Motor Electronics Coolant Pump B Control Performance
The motor electronics coolant pump B control reports a performance fault. Pump output does not match commanded duty.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Pump output degradedCommon
- Air pocket in coolant loopPossible
Parts involved
- Motor Electronics Coolant Pump B
P0C74 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.