Full throttle throws codes. Please Help!!!

Sheagaffney · 09-10-2019, 02:52 AM

Im sure this has been figured out and posted about already but I have not been able to find anything with an exact match of problems so I'm hoping you can help.
im running MHD stage 2 with DCI, and catless downpipes. Every time I give the car full throttle and the car seems to hit full boost somewhere around 4500ish RPM it throws a check engine light, goes into limp mode and shows code of 29f3 fuel low pressure sensor, 2aaf fuel pump plausibility,, and 2a17 DTML system fault. only under full throttle does this happen, but it happens every time at full boost. Other then this car car runs great if you keep out of the boost. Any input you have would be greatly appreciated. Thank you.

-Shea

Sheagaffney · 09-10-2019, 04:11 PM

Does anyone have any links that might help me figure out what is going on? Thank you?

dpaul · 09-10-2019, 07:19 PM

The 29F3 and 2AAF together indicate a problem with the low pressure fuel system: could just be the sensor or it could be the LPFP or EKP module. The DMTL code is probably irrelevant or secondary. The sensor is cheap and not difficult to access - just replace it.

You've got MHD, buy the logging module and make a log. That will give additional valuable information about how your engine is operating. Honestly, logging is the best thing you can do.

If your engine actually does not reach full boost until 4500rpm, there could be an issue beyond the low pressure fuel problem. But deal with fuel pressure first

09-10-2019, 02:52 AM	#1
Sheagaffney New Member 3 Rep 11 Posts Drives: 2007 BMW 335xi Join Date: May 2018 Location: Scottsdale, AZ iTrader: (0)	Full throttle throws codes. Please Help!!! Im sure this has been figured out and posted about already but I have not been able to find anything with an exact match of problems so I'm hoping you can help. im running MHD stage 2 with DCI, and catless downpipes. Every time I give the car full throttle and the car seems to hit full boost somewhere around 4500ish RPM it throws a check engine light, goes into limp mode and shows code of 29f3 fuel low pressure sensor, 2aaf fuel pump plausibility,, and 2a17 DTML system fault. only under full throttle does this happen, but it happens every time at full boost. Other then this car car runs great if you keep out of the boost. Any input you have would be greatly appreciated. Thank you. -Shea Last edited by Sheagaffney; 09-10-2019 at 04:11 PM..
	Appreciate 0 Tweet Quote

09-10-2019, 04:11 PM	#2
Sheagaffney New Member 3 Rep 11 Posts Drives: 2007 BMW 335xi Join Date: May 2018 Location: Scottsdale, AZ iTrader: (0)	Does anyone have any links that might help me figure out what is going on? Thank you?
	Appreciate 0 Quote

09-10-2019, 07:19 PM	#3
dpaul Lieutenant Colonel 662 Rep 1,893 Posts Drives: 2009 E90 335xi, 2011 E93 M3 Join Date: Dec 2012 Location: Boston iTrader: (3)	The 29F3 and 2AAF together indicate a problem with the low pressure fuel system: could just be the sensor or it could be the LPFP or EKP module. The DMTL code is probably irrelevant or secondary. The sensor is cheap and not difficult to access - just replace it. You've got MHD, buy the logging module and make a log. That will give additional valuable information about how your engine is operating. Honestly, logging is the best thing you can do. If your engine actually does not reach full boost until 4500rpm, there could be an issue beyond the low pressure fuel problem. But deal with fuel pressure first
	Appreciate 0 Quote