Powertrain, generic (extended)

P26D3 Engine Coolant Pump Supply Voltage Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P26D3 concerns the power feed and ground of the engine coolant pump. On Ford's 2.0 L hybrids the pump module has no way of reporting a loss of these lines, since without power it goes quiet on the LIN bus. The PCM therefore draws a conclusion: if pump communication is lost (U019F) and the coolant has meanwhile warmed by more than 10 °C, it assumes the pump has stopped and sets P26D3 after five seconds; without the temperature rise only the communication code is stored. Ford's Boss 302S code list also contains P26D3. Typical causes are a blown fuse, a failed relay, a broken feed or a loose ground. As the pump does not run, the engine can overheat quickly, so the car should not be driven far.

Likely causes

Blown pump fuse or failed supply relay
Broken power feed or loose ground at the pump
Pump electronics dead so that the pump neither runs nor communicates

Symptoms

  • Check engine lamp on
  • Engine temperature climbing quickly
  • U019F stored at the same time

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€20–1,200
Time0.3–3 h

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

Parts involved

smart coolant pump modulesupply circuit

Related codes

P26D4P26D5P26CAU019F

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