Engine Fuel Injection Pressure Too Low

The computer looks at the fuel injection pressure sensor and sees that the pressure is lower than it should be, which can lead to engine performance issues.

The engine control module (ECM) is monitoring fuel pressure—ideally, it should be around 250-300 kPa (36-43 psi) at operating conditions. If it sees values below 200 kPa (29 psi) for a set duration (usually over a few seconds), it triggers this code.

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.

1. 11. Check for any visible fuel leaks around the fuel lines and connections. Look for damp spots or wetness. If found, repair as necessary. Decision: No leaks? Go to step 2.
2. 22. Inspect the fuel filter for clogging. Make sure it's replaced if it's due (usually every 20,000-30,000 miles). Decision: Filter is clear? Go to step 3.
3. 33. Test the fuel pressure with a gauge at the fuel rail. Start the engine and measure the pressure. Are you getting at least 250 kPa (36 psi)? Decision: Yes? Go to step 4; No? Fuel pump may need replacement or further check. Proceed with low-pressure diagnosis.
4. 44. Check the electrical connector and wiring for the fuel pressure sensor. Ensure it’s clean and free from corrosion. Decision: Good condition? Go to step 5; Bad condition? Repair or replace wiring/connector as needed.
5. 55. Test the fuel pressure regulator by removing the vacuum line (if equipped) and monitoring for changes. Is fuel leaking from the vacuum port? Decision: Yes? Replace the regulator; No? Go to step 6.
6. 66. Replace the fuel pressure sensor if all previous tests are satisfactory.

• Clogged fuel filter
• Weak fuel pump
• Leaking fuel lines
• Faulty fuel pressure regulator
• Defective fuel pressure sensor

$$-$$$