P228D code meaning
Fuel Pressure Regulator A Exceeded Control Limits - Pressure Too High
Powertrain system Generic code P22xx codes Check engine light
What P228D means
P228D is the opposite of P228C: measured rail pressure stays above the setpoint for too long although regulator A should be cutting delivery. GM's gasoline table 25OBDG03A flags it when the high-pressure pump supplies more than requested for 10 of 12.5 s, as Type A; its 2018 diesel table uses minus 13 MPa with the metering unit in closed loop (Type B), and table 24OBDG07 minus 3 MPa for 7 s. Causes range from a pump control valve that will not shut off, via a pressure sensor reading wrong, to calibration: GM bulletin 17-NA-069 cures P228D on 5.3 L and 6.2 L V8s by reprogramming, and PACCAR bulletin E114 links it, with P0094, to defective unit pumps on MX-13 truck engines. Expect harsh running or derated power.
P228D at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P228D
- Check engine light
- Louder injection noise or rough idle
- Reduced power in some cases
Common causes of P228D
- Most likelyPump control or metering valve not reducing delivery
- PossibleEngine control software needing an update
- PossibleRail pressure sensor reading too high
- Less likelyDefective unit or high-pressure pump (truck engines)
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel pressure regulatorHigh pressure fuel pump
What each part of P228D means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 8D | The exact fault in that area. |
What to do next
- Note P228D 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 P228D
What does P228D mean?
P228D means "Fuel Pressure Regulator A Exceeded Control Limits - Pressure Too High". P228D is the opposite of P228C: measured rail pressure stays above the setpoint for too long although regulator A should be cutting delivery. It is a generic code, so it means the same on every make.
Is it safe to drive with P228D?
Drive gently and only to a workshop. With P228D the car can go into limp mode (reduced power) to protect itself.
Will P228D fail an emissions test?
Yes, it can. P228D 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 P228D to fix?
Difficulty: hard. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will P228D clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.