P2C49
Coolant Pump D Control Circuit Performance/Stuck Off
Coolant pump D is commanded on but does not respond as expected. Pump motor stuck, relay weld, or driver fault.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Pump motor mechanically stuckCommon
- Output driver faultPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Coolant Pump D
- Wiring Harness
- ECM
P2C49 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.