Good day, I have a very, very strange and unusual problem with my car. There are multiple errors that don’t make any sense to me. I think it would be best to start from the beginning, to explain how it all started.
Last year in October, the air conditioning started behaving strangely. At first, it wouldn’t blow any air at all. Then, after a week, it started working normally for a few days. After that, the passenger side began blowing cold air even though it was set to heat. Two days later, it returned to normal.
Shortly after that, a start-stop system error appeared on the display near the steering wheel. Then, five days later, a new yellow battery warning appeared, saying it wasn’t critical, but should be checked by a mechanic.
At that point, I started researching what the problem might be, and various potential issues came up. I tried disconnecting and reconnecting the cable that goes to the battery’s negative terminal sensor, and the yellow battery warning disappeared.
After all that, we tried to use the rear window defroster (which we normally don’t use), but it didn’t work.
I then bought three different diagnostic tools and replaced the sensor on the battery’s negative terminal, but the error about no communication with the sensor remained. In the meantime, the original battery completely failed. I installed a new Varta battery, but I can’t code it into the system, likely due to the same errors I’ll show later.
I tried testing the LIN wire on both the alternator and the sensor on the battery’s negative side — both are measuring 9.8V with the engine running but the car idling.
Another thing that I found very interesting: I removed the flap motor from the AC system (which was flagged as a mechanical fault), tested it outside its housing, and it worked fine. After reinstalling it, it worked normally for a few days, then the mechanical fault reappeared.
From what I can see, there are two persistent errors: one for basic settings, and another for the motor that brings in fresh air.
One more thing: last week, the flap motor on the driver’s side completely jammed — it wouldn’t respond no matter what I did. And now, all of a sudden, it’s working perfectly again.
Thanks in advance to everyone for any advice or help on what to do.
Last year in October, the air conditioning started behaving strangely. At first, it wouldn’t blow any air at all. Then, after a week, it started working normally for a few days. After that, the passenger side began blowing cold air even though it was set to heat. Two days later, it returned to normal.
Shortly after that, a start-stop system error appeared on the display near the steering wheel. Then, five days later, a new yellow battery warning appeared, saying it wasn’t critical, but should be checked by a mechanic.
At that point, I started researching what the problem might be, and various potential issues came up. I tried disconnecting and reconnecting the cable that goes to the battery’s negative terminal sensor, and the yellow battery warning disappeared.
After all that, we tried to use the rear window defroster (which we normally don’t use), but it didn’t work.
I then bought three different diagnostic tools and replaced the sensor on the battery’s negative terminal, but the error about no communication with the sensor remained. In the meantime, the original battery completely failed. I installed a new Varta battery, but I can’t code it into the system, likely due to the same errors I’ll show later.
I tried testing the LIN wire on both the alternator and the sensor on the battery’s negative side — both are measuring 9.8V with the engine running but the car idling.
Another thing that I found very interesting: I removed the flap motor from the AC system (which was flagged as a mechanical fault), tested it outside its housing, and it worked fine. After reinstalling it, it worked normally for a few days, then the mechanical fault reappeared.
From what I can see, there are two persistent errors: one for basic settings, and another for the motor that brings in fresh air.
One more thing: last week, the flap motor on the driver’s side completely jammed — it wouldn’t respond no matter what I did. And now, all of a sudden, it’s working perfectly again.
Thanks in advance to everyone for any advice or help on what to do.
Code:
Sunday,18,May,2025,13:25:38:11961
VCDS Version: Release 25.3.1 (x64) Running on Windows 11 x64
www.Ross-Tech.com
Address 19: CAN Gateway Labels: None
Control Module Part Number: 8W7 907 468 E HW: 8W7 907 468 E
Component and/or Version: Gateway H42 0116
Software Coding: 03010001000006C041070000005900325C3A0007100000000175079E10000000
Work Shop Code: WSC 12345 123 61029
ASAM Dataset: EV_CGateCONTIAU491 003092 (AU49)
ROD: EV_CGateCONTIAU491_003_AU49.rod
VCID: 4DC3B89DBD53F5F234D-8018
2 Faults Found:
197149 - Generator
U1052 00 [00001001] - No Communication
[Break_Down_LIN_Communication_Alternator]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 4
Fault Frequency: 1
Reset counter: 109
Mileage: 164902 km
Date: 2025.05.17
Time: 21:34:39
197175 - Control unit for battery monitoring
U1050 00 [00001001] - No Communication
[Break_Down_LIN_Communication_Battery_Monitoring]
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Priority: 4
Fault Frequency: 1
Reset counter: 109
Mileage: 164902 km
Date: 2025.05.17
Time: 21:34:39
Code:
Sunday,18,May,2025,15:52:25:11961
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 25.3.1.0 (x64) HEX-V2 CB: 0.4671.5
Data version: 20250408 DS365.0
www.Ross-Tech.com
Gateway Installation List: 8W7 907 468 E
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: OK 0000
13-Auto Dist. Reg -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: Malfunction 0010
22-AWD -- Status: OK 0000
29-Left Light -- Status: OK 0000
39-Right Light -- Status: OK 0000
3C-Lane Change -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
81-Gear Shift -- Status: OK 0000
82-Head Up Display -- Status: OK 0000
8B-Adaptive Cruise 2 -- Status: OK 0000
A5-Frt Sens. Drv. Assist -- Status: OK 0000
AC-Reductant Control -- Status: OK 0000
BB-Door Rear Drv -- Status: OK 0000
BC-Door Rear Pass -- Status: OK 0000
CF-Lane Chge Asst 2 -- Status: OK 0000
D6-Light Ctrl Left 2 -- Status: OK 0000
D7-Light Ctrl Right 2 -- Status: OK 0000
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