P26F9 Coolant Pump C Control Module Overtemperature

Electric coolant pumps carry their own control electronics, which are cooled by the liquid passing through the pump. P26F9 means the electronics of pump C have reported a temperature above their limit. That rarely points to a defect in the module itself; far more often coolant is missing around it, air is trapped in the pump, the impeller is partly blocked and draws high current, or the pump sits in a very hot spot. No manufacturer documents P26F9 in public. Ford's OBD summaries show how such a check works on the engine coolant pump code P26D2: the pump reports its temperature over LIN and the PCM stores the code once 130 °C is exceeded for five seconds. CARB requires electronic components that serve emission control to be monitored. The electronics usually derate or stop the pump to protect themselves.

Likely causes

Symptoms

• Check engine light on
• Pump C runs at reduced speed or switches off temporarily
• Heating or cooling of the affected loop varies

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, fordservicecontent.com.