Thread: P2AAF code
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      11-23-2021, 08:52 AM   #1
Nelly98
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Drives: BMW 135i
Join Date: Nov 2021
Location: USA

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Question P2AAF code

My CEL came on for P0174 (Fuel system too Lean Bank 2) and P2AAF (Fuel pump plausibility). I have a custom tune on a COBB acccessport. I did a data log in 3rd gear at 100% throttle from 2800 to 5400 RPM and the results showed that the fuel psi from the low pressure fuel pump was lower than required. Soon after that, my engine went into limp mode while in 3rd gear at 4500 RPM. I replaced the LPFP and reset the codes. I took it back out for another data log and the psi was now above what was required so I thought the issue was fixed. After driving about 70 miles, the CEL came back on, but with only the P2AAF code. Does anyone know what might be causing this? Thanks!
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