Fuel Pressure Regulator A Exceeded Learning Limits - Too High

Check these first

• A stuck-closed fuel pressure regulator A holding pressure high
• A clogged return line trapping pressure in the rail
• A failed in-tank pressure regulator raising the base pressure
• A biased fuel pressure sensor feeding wrong data to the ECM
• A restriction in the rail or the regulator feed

What to do next

1. Check actual fuel pressure against spec at idle
2. Check the return line for a kink or blockage
3. Compare the fuel pressure sensor reading to a mechanical gauge
4. Inspect fuel pressure regulator A for sticking
5. Replace regulator A or the pressure sensor that fails the check
6. Clear the code and retest

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