Request for Other Engine Supply Pressure
Engine management detected an issue with the supply 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 controller is asking about the pressure in the fuel system, but it isn’t getting the right readings, which might mean there's a fuel issue.
What the computer is actually seeing
The engine computer expects a specific fuel pressure reading, typically between 40-60 psi during operation. If it receives a value that's too low or insufficient to meet the engine’s demands, a fault is triggered.
What a healthy reading looks like
Expected fuel pressure: 40-60 psi during normal engine 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 fuel level in the tank. Ensure it's above a quarter tank.
- 22. Inspect wiring and connectors at the fuel pressure sensor for damage and corrosion.
- 33. Use a fuel pressure gauge to check for appropriate fuel pressure at the rail; replace the fuel filter if pressure is below 40 psi.
- 44. With the engine running, verify the voltage output from the fuel pressure sensor (should be 0.5V to 4.5V depending on pressure); replace sensor if out of range.
- 55. If the pressure is good but code persists, inspect the fuel supply pump for operation; it should engage and provide adequate pressure.
Common causes
- Faulty fuel pressure sensor
- Clogged fuel filter
- Fuel supply pump failure
- Wiring issues to the fuel pressure sensor
- Faulty engine control module (ECM)
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It’s generally safe but you may notice reduced power or fuel efficiency. Address it soon.
Will this code come back after resetting?
If the underlying issue is not fixed, yes, it will likely return.
Why does this code pair with others like SPN 4800?
Both codes are related to fuel supply pressure issues, often indicating a similar fault.
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