P027D code meaning
Fuel Pump Module B Control Circuit High
Powertrain system Generic code P02xx codes Check engine light
What P027D means
On demand-controlled fuel systems the engine module does not drive the pump itself but sends a pump control module the desired pump output on a separate control line, usually as a duty cycle; the module reports back on a monitor line or via CAN. Module B is a second pump module, for example on dual-tank commercial vehicles. P027D means the control circuit to pump module B reads high, typically a short to voltage – the counterpart of P025D. Ford lists it in the low-pressure lift pump monitor of its 2023 diesels, monitored continuously and set within 0.5 s, without its own threshold. Pump B may then run all the time or not at all.
P027D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P027D
- Check engine light on
- Pump B runs all the time or not at all
- Starting problems
Common causes of P027D
- Most likelyControl line to module B shorted to voltage
- PossibleMoisture or corrosion in the connector
- PossiblePump control module B faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel pump control module bFuel pump control wiringEngine control module
What each part of P027D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 2 | Area: fuel and air metering (injector circuit). |
| 7D | The exact fault in that area. |
What to do next
- Note P027D 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 P027D
What does P027D mean?
P027D means "Fuel Pump Module B Control Circuit High". On demand-controlled fuel systems the engine module does not drive the pump itself but sends a pump control module the desired pump output on a separate control line, usually as a duty cycle; the module reports back on a monitor line or via CAN. It is a generic code, so it means the same on every make.
Is it safe to drive with P027D?
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 P027D fail an emissions test?
Yes, it can. P027D 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 P027D to fix?
Difficulty: medium. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will P027D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.