High-Pressure Fuel Pump Trouble Code
Fuel pressure is too high or too low for the system.
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)
This code means the fuel system is not getting the right amount of pressure, which can cause engine performance issues.
What the computer is actually seeing
The engine control module (ECM) checks fuel pressure against expected values and detects a deviation outside the normal range.
What a healthy reading looks like
Normal fuel pressure should be between 50-75 psi (pounds per square inch) during operation.
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.
- 11. Check the wiring and connector to the high-pressure fuel pump for damage or corrosion. If found, repair or replace. Decision: If wiring is good, move to step 2.
- 22. Inspect the fuel filter for clogging. If dirty, replace the fuel filter. Decision: If filter was clogged, clear the code and test drive. If code returns, move to step 3.
- 33. Measure fuel pressure at the fuel rail with a gauge. If pressure is outside 50-75 psi, the pump may be faulty. Decision: If pressure is good, inspect for injector issues.
Common causes
- Faulty high-pressure fuel pump
- Clogged fuel filter
- Damaged fuel lines or connections
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not ideal; performance may be affected, but it may still be drivable short-term.
Will this code come back after clearing?
If the underlying issue isn’t fixed, expect it to return.
Why does this code pair with SPN 426?
SPN 426 relates to fuel rail pressure and can show up if the pressure issue affects fuel delivery.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →