FUEL PRESSURE - LOW PRESSURE
The fuel pressure is detected to be too low in the system.
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What it means (plain English)
The system is seeing less fuel pressure than it needs, which can cause the engine to run poorly or not start at all.
What the computer is actually seeing
The ECM compares fuel pressure readings to a predefined range. If the actual pressure drops below 200 kPa (around 29 psi) during operation, it triggers this code.
What a healthy reading looks like
Normal fuel pressure should be between 300 kPa and 500 kPa (around 43-72 psi) depending on 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.
- 11. Check fuel system wiring and connector integrity. Ensure there are no loose or damaged wires.
- 22. Inspect fuel filter for clogs; replace if necessary and re-check pressure.
- 33. Use a fuel pressure gauge to measure actual fuel pressure against expected values.
- 44. If pressure is low (under 300 kPa), check the fuel pump operation.
- 55. If the pump is functioning, inspect the fuel pressure regulator for proper operation and leaks.
- 66. If all components are okay but pressure is still low, consider potential air in the fuel system.
Common causes
- Clogged fuel filter
- Bad fuel pump
- Leaking fuel injector
- Faulty fuel pressure regulator
- Air in fuel system
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it's not safe as the engine may stall or have no start conditions.
Will the code come back after repairs?
If repairs are done correctly and the issue is resolved, the code should not return.
Why does it pair with SPN 6112?
SPN 6112 indicates high fuel pressure, so both codes can indicate problems related to fuel pressure regulation.
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