ultra guage pending trouble code u0109

[beaslbob]

Just got a pending trouble code u0109 today on the way to work. that decodes to something wrong with the communications with the fuel pump module.

I reset and will see if it comes back.

this is an ultra guage pending trouble code.

No actual trouble code no engine check light, appears to run fine.

An thoughts would be helpful

 

[gsxr1000]

Just got a pending trouble code u0109 today on the way to work. that decodes to something wrong with the communications with the fuel pump module.

I reset and will see if it comes back.

this is an ultra guage pending trouble code.

No actual trouble code no engine check light, appears to run fine.

An thoughts would be helpful

Mine did the same

 

[SteveSonic]

My 1.4T did the same last week. Does anyone have more info about why our systems are throwing this code? Thanks.

 

[Eric Smit]

A pending code is something that happens that would normally throw a code. If the engine senses it again within, and don't quote me on this, 40 warm up cycles, it will throw a CEL.


-Eric Smit

 

[Machine]

"U" codes are communication codes. Getting a U code means that communication was lost with one of more modules.

Pending U codes are usually nothing to worry about. They can easily be set when the vehicle is starting due to voltage fluctuations. Any number of things can cause a module to stop communicating temporarily. If voltage to the module is less than 10v, they can stop talking and set this code.

The condition usually disappears almost instantly, and the code clears after a while on its own. Modern vehicle computers are SUPER sensitive to any kind of changes, but dont always freak out (read: set engine/service lights) until they CONFIRM that there is actually a problem. Its just being cautious; it will record data when the fault happens and wait for it to happen again.

FYI, I generally see at least 1 U code anytime I do a full system scan on a vehicle, and generally it has nothing to do with what Im scanning the vehicle for.

I wouldnt worry about it.

 

[wingman]

Not sure if this has anything to do with a service bulletin on a fuel line, but I took mine in for the airbag recall and they had to check a fuel line as well. I'd give more details, but I dont have the invoice handy.

 

[Machine]

the fuel line thing is a 5min replacement of the firewall to engine fuel flex line. The repair is entirely mechanical.