P26D1Engine Coolant Pump Control Module System Voltage High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P26D1 is stored when the electronics of the engine coolant pump report a supply voltage clearly above the vehicle system voltage. Ford documents the check in its OBD summaries for hybrid and plug-in models: the pump module passes its measured electronics voltage on via the LIN link, and a reading more than about four volts above the battery voltage seen by the PCM for five seconds sets P26D1. The 2014 Boss 302S code list from Ford Performance also carries the code. A real overvoltage comes from a failing voltage regulator or a jump start with too high a voltage; more often the pump's own measurement drifts or the PCM reference is pulled low by a bad ground, so both sides need checking. The electronics may protect themselves by switching the pump off.
- What you may notice
- Check engine lamp on
- Unusually bright lights or other overvoltage codes
- Likely causes
- PossibleFaulty voltage regulator or overvoltage from jump starting
- PossiblePoor PCM ground making the reference voltage look low
- PossibleVoltage measurement drift inside the pump electronics
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €30 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.