P2602
Coolant Pump Control Circuit Open
The ECU detects an open circuit on the electric coolant pump control line. Without pump control the engine cannot actively manage warm-up and cool-down phases.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Pump motor openCommon
- Drive line openPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Electric Coolant Pump
- Coolant Pump Wiring
P2602 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.