The coolant pump is located at the front or top of the engine, or inside the wheel wells. This pump is operated through an electrical signal, coming from the Powertrain Control Module (PCM).
The PCM is given voltage inputs, with which it can determine the time and amount of time it needs to operate the coolant pump. These inputs are the result of reading the coolant temperature, intake air temperature, engine rpm, and air conditioning system pressure sensors. After the PCM receives this data, the necessary modifications are made to the coolant pump signal.
When the DTC P2600 OBDII code is set, it is because the coolant pump electrical circuit has experienced a malfunction.