P26CD code meaning
Engine Coolant Pump Control Circuit High
Powertrain system Generic code P26xx codes Check engine light
What P26CD means
P26CD is set when the control circuit of the engine coolant pump shows a higher voltage than the commanded state allows, for example while the driver is switched off. No manufacturer documents this code in public. CARB's OBD rule asks for output components to be monitored for circuit faults, and the same pump circuit is known from its low-side partner P26CC, which Honda documents on its hybrids in bulletin 25-020. Typical high faults are a control wire touching battery voltage, a relay whose contacts weld shut so the pump keeps running, or an open ground on the pump side. Depending on design the pump then runs permanently or cannot be regulated; the engine module usually stores the code at once and lights the MIL, while warm-up may take longer.
P26CD at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P26CD
- Check engine lamp on
- Pump running after the engine is switched off
- Longer warm-up phase
Common causes of P26CD
- Most likelyPump control wire shorted to battery voltage
- PossiblePump relay contacts stuck closed
- Less likelyOpen ground at the pump pulling the circuit high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine coolant pumpWiring harness
What each part of P26CD 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. |
| CD | The exact fault in that area. |
What to do next
- Note P26CD 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 P26CD
What does P26CD mean?
P26CD means "Engine Coolant Pump Control Circuit High". P26CD is set when the control circuit of the engine coolant pump shows a higher voltage than the commanded state allows, for example while the driver is switched off. It is a generic code, so it means the same on every make.
Is it safe to drive with P26CD?
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 P26CD fail an emissions test?
Yes, it can. P26CD 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 P26CD to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will P26CD clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.