P26F6 code meaning
Coolant Pump C Control Circuit High
Powertrain system Generic code P26xx codes Check engine light
What P26F6 means
P26F6 is stored when the control line of coolant pump C carries a higher voltage than the commanded state allows. In practice that means the wire touches a live circuit, the pump has lost its ground so the line floats up, or the line is open between driver and pump in a way the output stage reads as high. No public service document covers P26F6 itself. The low-side sister P26F5 is documented by Bentley for the auxiliary heater pump of its VW-group V8 models, where internal corrosion and pump self-diagnosis were the causes; CARB requires electric parts serving emission control or other monitors to be checked for such circuit faults. A pump held permanently on may keep running after the engine is switched off and drain the battery; one that cannot start leaves its loop without flow.
P26F6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P26F6
- Check engine light on
- Pump runs on after switch-off or does not run at all
- Weak heater output with the engine idling
Common causes of P26F6
- Most likelyControl wire shorted to battery voltage
- PossibleMissing or corroded ground at pump C
- Less likelyInternal electronics of the pump failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant pump cWiring harness
What each part of P26F6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| F6 | The exact fault in that area. |
What to do next
- Note P26F6 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P26F6
What does P26F6 mean?
P26F6 means "Coolant Pump C Control Circuit High". P26F6 is stored when the control line of coolant pump C carries a higher voltage than the commanded state allows. It is a generic code, so it means the same on every make.
Is it safe to drive with P26F6?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P26F6 fail an emissions test?
Yes, it can. P26F6 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P26F6 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P26F6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.