This is very hard to believe but I called Audi Customer Relations and after about 7 days of back and forth between Audi and the dealership, Audi called me back and told me as a gesture of goodwill they would pay for repairs. They paid for the Transmission Control Module and the labor but required me to pay $100 for oil and gaskets. Unbelievable!

I have changed all new glow plugs, new battery, both new Coolant Fans with control units and new Glow Plug relay (Glow Plug Control Unit). When I changed new Glow plug relay, I got following faults and I had to change the old relay back. Faults with new glow plug relay. 3 Faults Found: 1. 14555 - No Communication with Glow Plug Control Module

So another bit of digging and I came across a VCDS Basic Settings procedure to test output of the Actuator by doing the following: Ensure engine is running and up to operating temperature. Open VCDS and sync your cable etc. OpenEngine 01 > Basic Settings 03 >. Enter 33 in the Block then press Go.
Back story - The car went into a limp mode (loss power) on the way home. I scanned it and it came back with P0087 code. I checked the hpfp valve, the fuel/filter was clean. I then changed the fuel filter (i had one as I planned changing it soon, as the last one was done 80,000km ago). Cleared the codes went for another drive, the car was
Many chain store will prescribe the same glow plug for vehicles from 1996 to 2006 and it ain't so. Your car has glow plugs that work at a different voltage than the pre-2004 cars and are also software update dependent. You will have to know which software is in your engine computer to get it right.
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.
The code P0671 tells you that something in the glow plug circuit is faulty causing the glow plug on cylinder #1 to fail to heat up. The entire circuit must be checked to locate the fault. Note: If a P0670 trouble code is present along with this DTC, carry out P0670 diagnosis before diagnosing this code. Symptoms. With just one glow plug failure
4. Faulty Brake Pedal Switch. The ESP system needs to know when you are pressing the brake pedal. For this function to work properly, there is a brake pedal switch installed on your brake pedal. If this switch is faulty and sends out the wrong information, it may cause the ESP light to come on. 5. ECM (Engine Control Module) = ECU (engine control unit) G28 (engine speed sensor) reads rpm (= engine speed) and confirmation that engine is turning, with a hall sensor detecting the TDC mark/notch (actually well before TDC) on the flex plate or flywheel (depending on manual or auto trans).
Audi a4 glow plug removal and fitting for those who find it tricky Subscribe, share and like and thumbs up Instagram - @an.automotive
Cigar lighter / power outlet fuses in the Audi Q5 are the fuses D1 (Rear center console outlet), D2 (Center console front outlet), D3 (Luggage compartment outlet) and D4 (Cigarette lighter) in the Luggage compartment (2009-2012), or fuse C2 in the Luggage compartment (2013-2017).
P0684 00 related to the Glow Plug Control Module. Glow plugs are essential for starting a diesel engine, especially in cold weather. They heat up to assist with ignition and also improve emissions by promoting effective regeneration of the Diesel Particulate Filter (DPF). It was clear that the Audi Q5 was not starting due to a malfunctioning
Installation instructions AUDI Q7 2015 AUDI Q7 e-tron 2016 AUDI Q7 (PU) 2020 Towing bracket with electrics set (NAR) for package number 4M0.092.115.*
Not enough power supply or voltage is being directed to the module. Too much voltage is being directed to the module. Disintegrated connections between modules. Failing sensors. Especially high engine temperatures. Exposure to water or too much moisture. Extreme engine conditions such as intense vibration. VNdwz.
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    • audi q7 glow plug control module location