The usual suspects with the glo plug system is individual plugs (one in each cylinder) beginning to increase resistance or burning out - open circuit. There is a glo plug control module which can also fail. It is relatively easy to check individual glo plugs with an ohmmeter but you should expect very low resistance - on the order of 0.1 to 0.2 On both the 4 cylinder and the V6 engines the glow plugs are controlled by J179 - Automatic glow period control unit which is connected to J623 - Engine control unit. If by " comfort control module" you are referring to J393 - Convenience system central control unit then the answer is no, the car will no longer start. Glow plug flashing orange, car seems slower to pick up like turbo not working, poor acceleration. Trying to rev over 2-2,500rpm eventually results in Emissions light coming on constant (orange engine light) car then goes into limp mode. VAC test show; P2002 (00) particulate trap efficiency below threashold, bank 1. 3.0TFSI Engine Discussion - AUDI Q7 3.0 Limp mode - every drive - Hey Guys, Im in need of some Audi brains and experience here My 2015 keeps going into limp mode (glow plug light on the dash and random engine light some times appears ) when its either driven hard or under load ECU ENGINE CONTROLLER ecu engine control module. Our offer includes vehicle module programming ECU ENGINE CONTROLLER AUDI Q7 3.0 TDI 4L0910401G, 4L0 910 401 G, 4L0907401A, 4L0 907 401 A, BOSCH 0281014174, 0 281 014 174, DIESEL EDC17CP04 CASA 0070 1039S26480 depending on the ecu type it can be programmed in a variety of ways. it may be possible though that not all the options are available for 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. f2aJWL.