Misfire Detected - Low Fuel Pressure
Engine misfire due to low fuel pressure.
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's computer notices that one or more cylinders aren't firing correctly because the fuel pressure is too low, causing poor engine performance.
What the computer is actually seeing
The engine control module (ECM) monitors the fuel pressure while the engine is running. If it sees a pressure below 30 PSI when it should be 40-60 PSI, it sets this code.
What a healthy reading looks like
Normal fuel pressure should be between 40-60 PSI while the engine is running. Fuel pressure should not drop more than 5 PSI during heavy acceleration.
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 fuel pressure with a gauge; it should be 40-60 PSI. If not, go to step 2. If yes, inspect for clogged injectors or a misfire code.
- 22. Inspect the fuel pump fuse and relay for proper operation. If they're good, go to step 3. If any are faulty, replace them.
- 33. Replace the fuel filter if it's clogged. Restart the engine and recheck the fuel pressure. If pressure is still low, go to step 4.
- 44. Check for voltage at the fuel pump while cranking; a healthy pump should get 12 volts. If voltage is absent, check wiring and connectors.
- 55. If voltage is present and pressure is low, replace the fuel pump. If pressure is normal but misfire persists, inspect fuel injectors.
Common causes
- Clogged fuel filter
- Weak fuel pump
- Leaking fuel pressure regulator
- Blocked fuel injectors
- Loose or damaged fuel lines
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not advisable; continue driving could worsen engine performance and lead to further damage.
Will the code come back after clearing it?
If the underlying issue isn't fixed, the code will likely return after a short drive.
Why do I see this code with misfire codes?
They often occur together because low fuel pressure causes inadequate fuel delivery, leading to misfires.
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