High Pressure Fuel Pump (HPFP) Performance
The Engine Control Module (ECM) detects a performance issue with the high pressure fuel pump.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
Your truck's computer sees that the high pressure fuel pump isn't creating enough pressure to supply fuel properly, which can cause poor engine performance or stalling.
What the computer is actually seeing
The ECM monitors the fuel pressure in real-time. Ideally, it should see a steady pressure (around 2,000-2,500 psi) from the HPFP during normal operation. A sudden drop in pressure or slow response time indicates a fault.
What a healthy reading looks like
Expected fuel pressure should be between 2,000 to 2,500 psi while the engine is under load.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Check the fuel filter for clogs. Replace if dirty.
- 2Inspect all fuel lines and connections for leaks. Repair as necessary.
- 3Verify the high pressure fuel pump operation; measure output pressure at the rail.
- 4Test the fuel pressure regulator for correct operation; ensure it holds pressure and doesn't leak.
- 5Scan for other related fault codes that may indicate systemic issues.
Common causes
- Clogged fuel filters
- Weak or failing high pressure fuel pump
- Leaking fuel lines or connections
- Faulty fuel pressure regulator
- ECM programming issues
Typical repair cost
$$$
Related codes
Frequently asked questions
Can I still drive with this code?
It's not recommended to drive long distances, as it can lead to increased engine performance issues.
Will this fault code come back after clearing it?
If the underlying issue isn't fixed, the code will likely reappear.
Why does this code often pair with fuel pressure issues?
The system's performance is directly tied to fuel pressure; if the pump fails to deliver, it triggers this code.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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