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My car is 2009 Audi A8 D3 - V8 FSI, 4.2 L with 189 000 KM (118 000 Miles)
My 2009 A8 4.2L has started to give me some issues.
In September 2024 one day, the car first started - no problem. After idling in the driveway for 5 – 10 minutes, once we pulled out, the car died in the middle of street. I tried starting it, starter running, engine turning, but did not fire up.
Try to start again, but no luck. It appeared as “flooded” or no gas was reaching. We waited for about 1 hour, came back to the car, tried starting and the car started with no problem. We did some errands, came home and the car was running, no problem.
In November I drove to get gas about 5 minutes’ drive from our house. When leaving the gas station the car started - no problem. But then once you step on gas pedal, after 30 – 50 feet the car died. Same here, I tried starting it, starter running, engine turning, but did not fire up. We waited for about 30-40 minutes. Tried starting and the car started no problem.
In June 2024 installed new, correct size, Interstate conventional battery for this car.
I have codes P3089 / 12425
Fuel pump electrical signal wire / lower limit not reached.
At this point I am not sure if the issue would be fuel pump or fuel pump control module.
Could this be connector or wiring issue? Anyone else ever run into this issue?
Thanks in advance
Hopefully there is anyone that can provide advice how to replace fuel delivery control module. 2009 Audi A8 D3 - V8 FSI, 4.2 L I had codes P3089 / 12425
I figure the issue could be fuel pump module (not fuel pumps), since car is running no problem other times.
FUEL DELIVERY CONTROL MODULE 4E0 906 093 B OEM (Fuel Pump Control Module)
I am not able to locate any info on fuel pump module replacement
I think you should be able to get at it in the trunk
Find your self the fuel supply shop manual for your engine to be sure. Search is your friend.
– Unplug electrical connectors -1- and -2- on flange (left-side).
– Remove plugs in luggage compartment floor and unscrew
nuts -arrows-.
– Slightly lift floor panel in the area of flange by hand and remove
fuel pump control unit - J538- between floor panel and fuel tank
flange.
– Unplug electrical connector at control unit.
I really appreciate your quick reply. I do have a fuel supply manual. From the blueprint I know the location of that part. A few days ago (in the trunk) I removed both (silver) lids from both fuel pumps. Then I stopped. Since the space is very tight. I took some pictures. I don’t see myself to be able to put my hands in there. Even if I can place my hand there and locate the module, how would I unscrew those two screws.
I will try to get fuel supply shop manual and take it from there.
It says there are 2 plugs (rubber?) you remove from the floor and you can unscrew it from the top and pull it out after. Maybe yours is different hence the recommendation to be sure you have the right manual.
On my trunk floor there are no screws or rubber plugs.
It appears that I was able to locate the module. I used the mirror to see it and took pictures.
I could feel the connecting cable with my hand. Couple inches from the opening for fuel pump towards rear of the car.
That area is very tight, and it doesn’t appear that I would be able to disconnect, unscrew Hexagon nut and pull out the module.
I was reading other forums for other models, and they suggest to drop the fuel tank a bit.
Do not need to drop it completely. Only loosen up straps holding it in place to gain extra few inches at the top of the tank, so I can work with it. I think that should work. As long there are no issues to drop fuel tank few inches. So that’s my plan for now.
Good luck with the repair. Post some pictures if you are able to.
Hello AEightSilver
You were correct. There are actually two holes - size of the coin (Quarter or so). I missed it since it was covered up by “undercoating rubber silicone paste”. Did not think of it. And YES remove (peel off) rubber from the floor and you can unscrew it from the top (through the two holes) and pull out the unit (Lift the metal bit) via large opening for fuel pump.
Finaly got things sorted out.
The problem I described in my post is now resolved. The issue has not happened since then.
It was faulty FUEL DELIVERY CONTROL MODULE 4E0 906 093 B
I was worried that it would be some “bad contact”
I bought MODULE from eBay for about US $69.09 = $95.00 CAD.
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Fuel pump / bad contact/ code P3089 / 12425
