P2600
Coolant Pump A Control Circuit/Open
Engine cooling
Generic OBD-II
Medium
What it means
P2600 means the ECM has detected an open in the control circuit for electric coolant pump 'A', so it can't drive the pump. On engines that rely on an auxiliary electric pump for cooling or cabin heat, this can let temperatures climb under certain conditions.
Medium
Can I keep driving? Usually drivable short-term, but the electric coolant pump may not run — watch the temperature gauge closely, as overheating is possible on some engines (especially turbocharged or hybrid).
Common symptoms
What you'll notice
- Check-engine light on
- Electric (auxiliary) coolant pump not running
- Coolant temperature rising higher than normal in some conditions
- Reduced cabin heat on vehicles that use the pump for heater flow
Common causes
Most likely first
- Open or broken wire in the coolant-pump control circuitLikely
- Corroded or loose connector at the pump or ECM/PCMCommon
- Failed electric coolant pump (open winding)Common
- Blown fuse or failed relay feeding the pumpLess often
- Faulty ECM/PCM driverLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data, then inspect the pump connector and wiring for open or corroded contacts.
- Check the pump's fuse and relay; confirm power and ground at the pump.
- Measure the pump winding resistance against spec — replace the pump if open.
- Repair any open in the control wire between the pump and the ECM/PCM.
- If wiring and pump test good, suspect the ECM/PCM driver. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2600?+
Often yes for short trips, but keep an eye on the temperature gauge. If it climbs toward hot, stop — an overheating engine can be damaged quickly.
Can I just clear P2600?+
You can, but it returns while the circuit is still open. Fix the wiring or pump first.
Related codes
Often seen with P2600
Read & clear P2600 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX