JB4tech.com - International Turbo Tuning Discussion
benmays99 benmays99 is offline
New Member
Posts: 3
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.
Reply With Quote
Steve @ BMS/Fuel-It!'s Avatar
Steve @ BMS/Fuel-It! Steve @ BMS/Fuel-It! is offline
Posts: 21,116
Join Date: Oct 2012
Car: 135i
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.

Click on our banner to visit our website!
Video of our Stage 2 LPFP upgrade installation.

BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways.
Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

vBulletin Skin developed by: vBStyles.com
Copyright 2007 - 2022, JB4tech.com