P2600Coolant Pump A Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2600 means the controller sees an open circuit on the line that drives electric coolant pump A, directly or through its relay. GM's 2023 ECM table tests the auxiliary coolant pump relay output while it is off: more than 200 kOhm for 5 of 6 seconds sets the code as Type B, so the MIL follows after two trips. On Ford's 2020-2023 gasoline engines pump A serves the cabin heating loop. Hyundai traces P2600 on 2016-2019 Sonata Hybrid and Plug-in Hybrid to an internal open or short in the electric engine water pump or to low coolant; Kia found water seeping into the housing of the auxiliary pump on early 2019 Niro hybrids, and Audi chafed gearbox wiring on 2023 A6/S6. P2602 and P2603 are the low and high faults, P2601 the function check.
- What you may notice
- MIL or hybrid warning lamp on
- Little or no cabin heat
- Rising coolant temperature in hybrid or after-run operation
- Likely causes
- LikelyInternal open circuit in the electric pump or its electronics
- PossibleWater or coolant ingress causing poor contact at the pump
- PossibleChafed or broken control wire, loose connector or failed relay
- RareCoolant level too low (named by Hyundai as possible trigger)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €60 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.