OBD-II code · Powertrain (generic, extended)
P2604 Coolant Pump Control Circuit High
The electric coolant pump drive line reads above the upper threshold — usually a short to positive or a stuck-on driver stage.
Is it safe to drive with P2604?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyDrive line shorted to positive
- PossibleDriver stage shorted on
- Less likelyConnector pins corroded - high contact resistance
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2.5 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Electric Coolant Pump, Coolant Pump Wiring
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.