Ongoing intermittant fault in this car, A4 B9 2017 2.0 TDI QUATTRO. New battery and alternator fitted by dealer and this fault continues. This is the first time I have managed scan with obd 11 and catch the fault code P068400, glow plug control module to power control module no comms, and just throws the standard drive system malfunction fault and no Start, but suprised this dosent allow the Make sure the boxes are unplugged (not just the sensors) and clean and tape them up. Check fuse #36 (I think) under hood should be 15a and replace if need be. You can go as far as to unplug the emissions BUS from the PCM this should make the whole wiring loom dead. Side note, this has worked for many from what I have read. HTML code is Off. Forum Rules. Hi. Always in the B7 forum but I have a 2007 Q7 TDI 3.0 that will not start. It shut off while my wife was driving it and it did once before that on me. The first time it started back up after about 10 minutes of trying and now it won’t start. Just keeps cranking. I’ve changed the glow plugs twice now thinking VW TDI forum, Audi, Porsche, and Chevy Cruze Diesel forum A forum community dedicated to Audi, Volkswagen, Porsche, and all turbo diesel owners and enthusiasts. Come join the discussion about performance, modifications, troubleshooting, TDI, maintenance, and more! The part replaced are: Control unit - central electric, Highline - Audi Q7 4L (ID:38963) LED Rear Lights Audi Q7 - retrofit- (ID:37109), Xenon/HID Headlights with LED DRL - Adapter - Audi Q7 4L (ID:38929), Adapter Facelift LED Indicator - Audi Q7 4L (ID:38945), signal lights 4L0953041D and. head lights 4L0941029AL. 2014 Audi Q7 3.0L TDI Prestige. I am thinking the seller reset all the codes prior to me purchasing it because shortly after buying it began to show symptoms of engine problems, such as stumbling and strange acceleration issues. Shortly after that the CEL illuminated and has been on ever since. Then the glow plug warning started flashing but The only wrinkle - for those not used to Audi connectors - is that it was easier for me to remove the connected fuel pump module first, and then disconnect the connector from the module after it was out. Otherwise, the connection tab is on the underside of the module, and the module is screwed into some sheet metal, so it was difficult to get to. Passat. Q5. Q7. Touareg; #2 (Qty. 2). WAGON, 2.0 LITER. WAGON, 2010-11, 2.0 LITER. Glow Plug - Repair or Replace If one or more of your glow plugs is in need of replacement, you'll likely experience an unusually long crank time when starting your engine. If the glow plug light in your 2012 Volkswagen Jetta flashes or remains steady, let our WZvT.