P0A05
Motor Electronics Coolant Pump A Control Circuit/Open
The motor electronics coolant pump A control circuit reports a control circuit/open condition. Power electronics cooling cannot be commanded reliably.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Open in pump control wireCommon
- Open pump motorPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Motor Electronics Coolant Pump A
- Wiring Harness
- Hybrid Control Module
P0A05 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.