High-Pressure Fuel Pump Performance
Indicates a problem with the performance of 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)
The engine control module (ECM) is detecting that the high-pressure fuel pump isn’t delivering the correct amount of fuel pressure for proper engine operation.
What the computer is actually seeing
The ECM monitors the fuel pressure at various points using a fuel pressure sensor. If the fuel pump does not maintain pressure within the expected range, the ECM sets this fault code.
What a healthy reading looks like
Expected fuel pressure typically ranges from 4,000 to 30,000 psi depending on the engine load and RPM.
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 level in the tank. It should be above 1/4 tank to avoid fuel starvation.
- 2Inspect the fuel lines for leaks or damage. Ensure all connections are tight and free of cracks.
- 3Test the fuel pressure with a gauge. It should match the expected values under various engine conditions. If not, proceed to the next step.
- 4Check the electrical connections to the high-pressure pump for corrosion or loose connections. Repair as necessary.
- 5If the fuel pump is not operating correctly, replace it and retest the fuel pressure.
Common causes
- Clogged fuel filter
- Faulty high-pressure fuel pump
- Leaking fuel lines
- Faulty fuel pressure sensor
- Electrical issues in the fuel pump circuit
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, this code indicates a severe fuel delivery issue. Driving could lead to engine damage.
Will this fault code come back if I clear it?
Yes, if the underlying problem is not fixed, the code will likely return.
Why does this code sometimes pair with low fuel pressure codes?
Low fuel pressure codes often indicate a failing pump, which would lead to performance issues reflected by this code.
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