Code Definition

P26CB — Engine Coolant Pump Performance/Stuck Off

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P26CB

P26CB is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P26CB is stored, the module has detected a plausibility fault — the measured value is in the electrical range but is not consistent with expected operating behaviour.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P26CB is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The PCM monitors the electric engine coolant pump operation and performance. Code P26CB is set when the PCM detects that the engine coolant pump is not performing as expected or is stuck in the off position. The electric coolant pump is responsible for circulating coolant through the engine and cooling system to maintain proper operating temperature. In vehicles with variable coolant pumps, the pump speed is controlled by the PCM based on engine temperature, load, and other factors. When the pump fails to operate or underperforms, the engine may overheat. This code is commonly found in vehicle...

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