P2D27 code meaning
Coolant Pump F Control Circuit Performance/Stuck Off
Powertrain system Generic code P2Dxx codes Check engine light
What P2D27 means
P2D27 is the functional check for coolant pump F, the sixth auxiliary pump in the lettering scheme and thus only relevant on vehicles with very many electric pumps, typically plug-in hybrids, electric vehicles or heavy diesels with several separate loops. The control line answers, yet the pump stays off or falls short of what the module expects from speed, current or temperature response. No manufacturer publicly documents P2D27, and unlike pump E no further pump F fault codes appear in common code lists. Published logic exists only for siblings: GM's 2025 diesel table judges pump C (P2C48) by comparing phase current with speed above 2,800 rpm, 10 failures out of 12, type B. Ford's 2024 gasoline summary watches its pumps A and B (P2601, P261B) for 5 s from 11 V. Check the loop, then pump and wiring.
P2D27 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P2D27
- Malfunction indicator lamp on
- Overtemperature in the component or loop served by pump F
- Power limitation if the cooled component protects itself
Common causes of P2D27
- Most likelyPump F blocked or worn so it runs too weakly
- PossibleAir pocket or low coolant in the circuit of pump F
- PossibleCorroded connector or high resistance in the pump F supply
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Coolant pump fWiring harnessECM
What each part of P2D27 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 27 | The exact fault in that area. |
What to do next
- Note P2D27 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 P2D27
What does P2D27 mean?
P2D27 means "Coolant Pump F Control Circuit Performance/Stuck Off". P2D27 is the functional check for coolant pump F, the sixth auxiliary pump in the lettering scheme and thus only relevant on vehicles with very many electric pumps, typically plug-in hybrids, electric vehicles or heavy diesels with several separate loops. It is a generic code, so it means the same on every make.
Is it safe to drive with P2D27?
Drive gently and only to a workshop. With P2D27 the car can go into limp mode (reduced power) to protect itself.
Will P2D27 fail an emissions test?
Yes, it can. P2D27 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 P2D27 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2D27 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.