P228F: Fuel Pressure Regulator A Exceeded Learning Limits - Too High

P228F is the upper counterpart of P228E: the learned correction for fuel pressure regulator A has run into its maximum. Ford's 2023 diesel summary applies one test to both codes on the 3.0 L and 6.7 L engines, with a limit near a 20 % rail pressure sensor slope error and about 10 s of monitoring at 600 bar or more. In heavy trucks, Volvo and Mack solutions K01029637 and K40914241 group P228F with P0087 and P016F for 11 L and 13 L common-rail engines; one cause they name is a damaged sealing lip on the second-stage filter that lets dirt reach the high-pressure side. Jaguar Land Rover message SSM 74588 lists P228F on the supercharged AJ126 petrol V6 together with high-pressure pump noise. Expect the MIL, possibly with rough running.

Symptoms

• Check engine light
• Noise from the high-pressure pump
• Uneven running in some cases

Most likely causes

• Dirt in the high-pressure system, e.g. via a leaking fuel filter seal
• High-pressure pump worn or noisy
• Rail pressure sensor characteristic drifted
• Low-pressure supply restricted

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the pump's fuse, relay, and connector
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
3. Replace the filter if it is due for maintenance
4. Compare commanded and actual pressure in live data
5. Measure the pressure with a suitable gauge
6. Check the sensor and regulator before replacing the pump

Good to know

• Repair difficulty: hard
• It affects emissions.

What each character of P228F means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 2: Fuel injection
• 8F: Specific fault in that system

Frequently asked questions

Can I keep driving with code P228F?

Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.

What causes code P228F?

The most common causes are: dirt in the high-pressure system, e.g. via a leaking fuel filter seal; high-pressure pump worn or noisy; rail pressure sensor characteristic drifted.

Related codes

• P228EFuel Pressure Regulator A Exceeded Learning Limits - Too Low
• P229DFuel Pressure Regulator B Exceeded Learning Limits - Too High
• P016FClosed Loop Fuel Pressure Control At Limit - Pressure Too Low
• P0087Fuel Rail/System Pressure - Too Low
• P0094Fuel System Leak Detected - Small Leak

Sources

• fordservicecontent.com: obd summary diesel 2023
• static.nhtsa.gov: MC 10153480 9999
• static.nhtsa.gov: MC 10170139 9999
• static.nhtsa.gov: MC 10167326 0001

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.