P26CFEngine Coolant Pump Control Module System Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Smart coolant pumps carry their own electronics, which measure the supply voltage they receive. P26CF is the general code for that voltage when it is implausible but cannot be assigned to too low or too high. No manufacturer documents P26CF itself in public. Ford's hybrid OBD summaries show the principle with the sister codes P26D0 and P26D1: the pump module sends its electronics voltage over LIN, and the PCM compares it with its own battery reading. CARB requires electronic components that affect emissions to be checked for plausibility. A general system voltage fault usually points to a shared cause – loose grounds, a weak battery, charging problems or intermittent contact – rather than to the pump. The pump may reduce its output or stop.
- What you may notice
- Check engine lamp on
- Other voltage-related codes stored at the same time
- Likely causes
- LikelyLoose, corroded or intermittent pump supply or ground connection
- PossibleWeak battery or charging system fault
- RareFaulty voltage measurement in 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.