Need advice please as to where to start with Q7 2120 Diesel Communication errors.

Chris Parsons <shihan.chris@gmail.com>

Sun, Apr 27, 3:38 PM (16 hours ago)

to me

Engine:
05619 - Engine Off Timer Performance
08169 - Terminal 30: Open circuit
09504 - Lost Communication With "Door Control Module A"

Transmission:
12810 - Lost Communication With: Anti-Lock Brake System (ABS) Control Module
12812 - Lost Communication With Steering Column Control Module

ABS:
01826 - Steering angle sensor, voltage supply terminal 30

Instrument cluster:
01316 - ABS control module: No signal/communication
01321 - Airbag control module: No signal/communication
00003 - Control module: no or incorrect basic setting/adaptation

Radio:
02095 - Component protection active

Heater & air conditioning:
01331 - Driver door control module: No signal/communication
01334 - Right rear door control module: No signal/communication
02874 - Comfort system central control module 2: No signal/communication

Central electronics:
03395 - Automatic high beam assist control module: No signal/communication
00446 - Function limitation due to insufficient voltage: Lower limit not reached
00532 - Supply voltage: Lower limit not reached
00061 - Foot well lights: Open circuit

Central electronics 2:
00446 - Function limitation due to insufficient voltage: Lower limit not reached
00532 - Supply voltage: Lower limit not reached

Body/convenience system:
01331 - Driver door control module: No signal/communication
01333 - Left rear door control module: No signal/communication
01334 - Right rear door control module: No signal/communication
02874 - Comfort system central control module 2: No signal/communication

Body/convenience system:
01331 - Driver door control module: No signal/communication

Front passenger's door:
01331 - Driver door control module: No signal/communication
01334 - Right rear door control module: No signal/communication
00446 - Function limitation due to insufficient voltage
00532 - Supply voltage: Lower limit not reached

Rear left door:
00446 - Function limitation due to insufficient voltage
00532 - Supply voltage: Lower limit not reached

Trunk:
01331 - Driver door control module: No signal/communication
00003 - Control module: Faulty

Ignition authorization:
01331 - Driver door control module: No signal/communication
01333 - Left rear door control module: No signal/communication
01334 - Right rear door control module: No signal/communication
00446 - Function limitation due to insufficient voltage: Lower limit not reached
00532 - Supply voltage: Lower limit not reached

Trailer:
01299 - Data Bus On Board Diagnostic Interface: No signal/communication
01336 - Comfort CAN bus: No signal/communication
02565 - Right turn signal lamp, trailer: Open circuit/short circuit to B+
00532 - Supply voltage: Lower limit not reached

 

Welcome to the MK1 Q7 forum, Chris!

Now if your Q7 was built after 2015, then you will belong in the MK II Q7 Forum instead, just FYI, as that's not clear from your post.

First thing is everything is errored out and/or shows low voltage issues/codes, so that means your battery voltage has dropped beflow a specified minimum level. Once you address the voltage issue (charge and test the battery to verify if still good; otherwise change out the battery), then you need to clear all fault codes and see what, if anything, comes back as a 'hard code'. Bear in mind, if the battery needs replacing, there is a programming/adaptation process for the BEM system you must do to keep the new battery charging properly. Oh yeah, and you want to ensure you get the OE/OEM same sized/capacity battery...don't buy a smaller battery for the Q7...you want the largest that fits (H9)

Good luck!

 

Sorry very sorry the car is 2012.....

 

Then it's now official...welcome to the MK1 Q7 Forum!!! Whoop-whoop!!!

One of the things this forum can really help you with is interpreting the diagnostic scan data when you don't know what you looking at yet, so once you get those faults cleared out and battery voltage is good, then rescan it again to see if anything pops up. Don't forget to save your scan data to a file if your scan tool doesn't do that automatically for you.

You should know anytime you unplug something on this car it throws a fault code. If your battery voltage is good and you still can't clear all these errors out, then suspect either damaged wiring/connections scenario, or possible water damage to control modules, etc. A little more context from you about the car status/history, etc., besides just fault codes on a scan would be helpful.

Enjoy fun with Q7s, and be sure you've watched or read about the 'known issues' of the 4L Q7 platform and your specific engine. The learning curve up front can be a bit steep, but great cars.

Here's one to bookmark: