P2600
ŚredniCoolant Pump Control Circuit 'A' – Open Circuit. The code indicates an open circuit or lack of electrical communication between the engine control module (ECM/PCM) and the electric coolant pump.
OBD-II (EN): Coolant Pump Control Circuit A Open
Error P2600 means a problem with the coolant pump electrical circuit – most often an open circuit in the harness or damage to the pump itself. The fault can lead to insufficient engine cooling, especially in city driving and hybrid vehicles. We recommend professional diagnosis to precisely determine whether the pump, harness, or controller is at fault.
Symptoms
Check Engine Light on, possible increase in engine temperature, lack of operation of the auxiliary coolant pump, problems with turbocharger cooling (in turbo engines), incorrect operation of the air conditioning system in idle mode (in hybrid vehicles), engine overheating message in extreme cases.
Possible causes
• Open or short circuit in the coolant pump wiring harness • Faulty electric coolant pump • Blown fuse or pump relay • Corrosion or loose connections in electrical connectors • Faulty engine control module (ECM/PCM) – output driver • Mechanical damage to the wiring harness (chafing, cuts)
Affected systems
Does code P2600 require professional diagnostics?
The code alone is not enough. To find the cause, you need to read live data, check freeze frame conditions, and compare with vehicle behavior. Book a diagnostic session.