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benmays99 benmays99 is offline
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Join Date: Aug 2021
Car: '09 E91 335i N54
Default Limp mode diagnosis - 08-19-2021, 03:29 AM

Hi guys, I'm looking for help identifying the cause of my N54 335 going into limp mode constantly. It seems to drive perfectly fine when not in limp mode but when it does it throws out the following codes:
2AAF - (DME) Fuel pump, plausibility
2D20 - (DME) Accelerator pedal module, pedal travel sensor, plausibility between signal 1 & 2
2AB4 - (DME) DME, internal fault, RAM Checksum

I did have a JB4 on it previously for a few days but I've taken it off and these codes are coming up now, could it be related to the JB4? I've been advised to replace the high pressure fuel pump but I want to be sure before I spend that sort of money.
Thanks!
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Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
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Default 08-19-2021, 09:41 AM

The first error (2aaf) you can ignore but the other 2 errors, especially the 2AB4 will need to be addressed and may be the cause of the 2D20 error. This does not appear to have anything to do with the JB4 or HPFP.



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