P228D on RAM
Fuel Pressure Regulator 1 Exceeded Control Limits - Pressure Too High
P228D on RAM vehicles indicates fuel pressure regulator 1 exceeded control limits - pressure too high. Au7o has documented this code across 1 RAM model — most commonly on 2500. This powertrain code means the engine computer detected that fuel pressure controlled by fuel pressure regulator 1 went higher than the desired/commanded level, beyond acceptable control limits. The system continuously adjusts the regulator to hold target fuel rail pressure; when actual pressure stays too high, this code sets. Excessive fuel pressure can cause a rich mixture, rough running, hard starting, and over time can stress injectors and the catalytic converter. It should be diagnosed promptly to avoid drivability and emissions problems. Typical repair costs on RAM range from $8,000 to $12,000, depending on the specific model and root cause.
Common Causes of P228D
- •Faulty fuel pressure regulator (sticking closed/restricted)
- •Faulty fuel rail pressure sensor
- •Restricted fuel return line or path
- •Wiring or connector fault on the regulator circuit
- •Mechanical high-pressure fuel pump fault
- •Faulty engine control module (less common)
P228D on RAM by Model
RAM 2500(1 issue)
- 6.7L Cummins CP4.2 High-Pressure Fuel Pump Catastrophic Failure2019-2025
The 2019+ RAM 2500 with the 6.7L Cummins diesel uses a Bosch CP4.2 high-pressure fuel injection pump that is prone to catastrophic self-destruction. The CP4.2 relies on diesel fuel for internal lubrication, and any contamination, water intrusion, or low fuel levels cause the pump to disintegrate, sending metal shavings throughout the entire fuel system. This contaminates fuel injectors ($500+ each x6), fuel rails, fuel lines, and the fuel tank, requiring a complete fuel system replacement costing $8,000-12,000+. The previous-generation CP3 pump was far more reliable. Multiple class-action lawsuits have been filed against Stellantis/Bosch.
Looking for P228D on a different make?
View P228D across all makes →Frequently Asked Questions
What does P228D mean on RAM?▼
P228D stands for "Fuel Pressure Regulator 1 Exceeded Control Limits - Pressure Too High." This powertrain code means the engine computer detected that fuel pressure controlled by fuel pressure regulator 1 went higher than the desired/commanded level, beyond acceptable control limits. The system continuously adjusts the regulator to hold target fuel rail pressure; when actual pressure stays too high, this code sets. Excessive fuel pressure can cause a rich mixture, rough running, hard starting, and over time can stress injectors and the catalytic converter. It should be diagnosed promptly to avoid drivability and emissions problems. On RAM specifically, this code is documented across 1 model.
What causes P228D on RAM vehicles?▼
Common causes on RAM: Faulty fuel pressure regulator (sticking closed/restricted), Faulty fuel rail pressure sensor, Restricted fuel return line or path, Wiring or connector fault on the regulator circuit, Mechanical high-pressure fuel pump fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P228D on a RAM?▼
Repair costs on RAM range from $8,000 to $12,000, depending on the specific model and root cause.
Which RAM models have P228D documented?▼
Au7o has documented P228D on 1 RAM model: 2500.