U0109 code

[DandD]

OK guys I need some help here, for some reason I am getting a U0109 code (failure to communicate with fuel pump module) and a CEL for that. I for the life of me can't figure out why I'm getting the code so anyone who knows of a reason that I would be getting this code would be greatly appreciated. I have the typical bolt on mods and it has a Jannetty tune. Recently I have added a RX catch can, and Vararam CAI with an updated tune from Ted. I have done NO work on the fuel pump or fuel system. The car had the original tune for 6 months with no CEL. I had to replace a rear O2 sensor that was broken and when I cleared the codes that the bad sensor was causing I had the U0109 code. I can clear it but the CEL comes on the second time you start the car after clearing it. Hopefully someone can shed some light on this issue.

Dan

[MA2010SS]

Dan, I took this from a GM website regarding your condition, it's a place where you can start looking for a possible problem, if the car is still under warranty I would take it in

On rare occasions, a customer may
experience one or all of the following
concerns:
1. Intermittent crank no start
condition
2. Extended crank
3. Vehicle stall condition
4. One or all of the following codes:
– P069E, P0230 or U0109 set
in the PCM
– P0606 set in the Fuel Pump
Control Module (FPCM)
These symptoms may be the result
of water intrusion into the Fuel Pump
Flow Control Module due to a disruption
in the case seal.
Check the Fuel Pump Control
Module (FPCM) for fuel controlspecific
DTCs (if communication is
possible) before inspecting connections.
Then refer to SI for those fuel
control DTCs. If module replacement
is required, replace the FPCM by
following the Fuel Pump Flow Control
Module replacement procedure in
SI and using the special procedure
below. Also clean or repair the related
connector if necessary.
Before installing the new module,
please follow instructions below to
prevent the vehicle from returning.
1. Clean the backside surface by
wiping or brushing to remove all
dirt, grease, water, etc. Surface
must be clean and dry.
2. Use GM approved RTV sealant
p/n 12378521. (Canada p/n:

88901148).

[DandD]

Thanks for that info, and yes I am probably going to have to take the car into the dealer. At least I'm not having any of the conditions described, the car seems to run just fine.