P26D0Engine Coolant Pump Control Module System Voltage Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P26D0 means the electronics in the engine coolant pump see less voltage than they should. On Ford's 2.0 L hybrids (C-Max, Fusion, MKZ) the pump module reports its electronics voltage over LIN, the PCM compares it with the battery voltage it measures itself and sets the code when the gap reaches about four volts for five seconds. Ford special service message 46857 links P26D0 on 2017 C-Max built June to September 2017 to water in a jumper connector shared with the active grille shutter, together with P26CA and U019F; message 47790 extends the corrosion pattern to Fusion and MKZ up to 2019. A voltage drop usually sits in the feed or ground to the pump rather than in the battery as a whole. The pump may slow down, so coolant temperature should be watched.
- What you may notice
- Check engine lamp on
- Network codes such as U019F stored alongside
- Rising engine temperature under load
- Likely causes
- LikelyWater or corrosion in a connector of the pump supply
- PossibleHigh resistance in the pump ground or feed wire
- RareWeak 12 V battery or low charging voltage
- 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.