2013 A5 Cabriolet 2.0T quattro A/C not working

   #1  

esrandl

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Hi, recently purchased a 2013 A5 B8.5 fairly cheap but required some work. I scanned the car with a standard code scanner and it showed no codes just after purchase. Car has been repainted but no obvious body damage/repairs and Car Fax also did not show any accident. It was very cold when I bought car and I cycled HVAC system but I probably didn't realize A/C wasn't actually working. It is now warmer and A/C obviously not working. Bought VCDS, came up with below error codes. I replaced the G395 sensor and still have the same error codes. New sensor was from US seller online, but likely not OEM. I have a non MMI car.

I have also done a fair amount of work in last month and most of it occurred before I got full VCDS scan on car. I have a lot of car experience to include HVAC install, various electrical work, engine rebuilds, etc. No problems on any work I did but it is possible that the codes didn't exist until after work.

I ran the diagnostics on the HVAC system and the compressor can cycle manually and does generate normal high/low side pressure results when it does cycle. Compressor will otherwise not trigger from dash control. Not sure where to go from here, the G395 sensor was super easy to swap but don't want to dig into other things if I am not sure whats wrong. Car runs great otherwise.

The work that I have done to car:
-replaced battery with OEM> did do the battery reset via VCDS. I had charged old battery several times prior to replacement but on slow rate, no jump or rapid boost.
-put a Sat Nav Backup cam system in. This required removal of most dash components to include radio/HVAC controls and video screen as well as glovebox and pass airbag. Nav system harness is a plug and play for existing harness and the system itself works fine. There are no other problems with HVAC controls/radio or anything else that I am aware of.
-put a new RS style front grille on, required removal of front bumper cover. No issues, it uncovers G395 sensor but I did the sensor exchange after bumper done and it is really easy. Bumper cover is likely original, lots of scratches on bottom and I didn't find any evidence of body work or repairs when it was off. I don't believe it has been repainted. I replaced the grille as the old one had peeling paint and a crack.
-spark plug replace, air filter, cabin air filter
-bluetooth mic/lights/homelink unit above rear view mirror. Just popped old unit and replaced, all components work fine.
-had drivers seat reupholstered professionally.
-replaced entire convertible top storage space liner assembly. Works fine now.


I found a TSB about 2011 (but not 2013) with these codes and suggested a problem with wiring being pinched or cut from central convenience module to G395 sensor. Not sure if that is even related. Not sure how to test sensor either, it could be I just replaced with another bad sensor as G395 goes bad often from what I read online.

Any help appreciated, thanks!

Code:
Chassis Type: FH-AU48 (8R0)
Scan: 01 02 03 05 06 08 09 15 16 17 19 26 2E 36 42 44 46 47 52 53
          56 62 72 77

VIN: WAUCFAFH0DN000438   Mileage: 79310km-49280miles

01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: OK 0000
06-Seat Mem. Pass -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
26-Auto Roof -- Status: OK 0000
2E-Media Player 3 -- Status: OK 0000
36-Seat Mem. Drvr -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
56-Radio -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
77-Telephone -- Status: OK 0000
-------------------------------------------------------------------------------
Address 01: Engine (DET-CPMA)       Labels:. 06H-907-115-CDN.clb
   Part No SW: 8K5 907 115 F    HW: 8K2 907 115 L
   Component: 2.0l R4/4V TF H09 0008  
   Revision: ECH09---    
   Coding: 622A0013242600062000
   Shop #: WSC 59277 001 1048576
   ASAM Dataset: EV_ECM20TFS0118K5907115F 001009
   ROD: EV_ECM20TFS0118K5907115F.rod
   VCID: 3537DC5345CBDCFF91E-8060

No fault code found.
Readiness: 1110 0101

-------------------------------------------------------------------------------
Address 02: Auto Trans (J217)       Labels:| 0BK-927-156.clb
   Part No SW: 8K0 927 158 T    HW: 0BK 927 156 AL
   Component: 0BK 20TFSIUSA H16 1001  
   Revision: --H16---    
   Coding: 000002
   Shop #: WSC 00000 000 00000
   ASAM Dataset: EV_TCMAL551211 002018
   ROD: EV_TCMAL551211_002_AU48.rod
   VCID: 47CBA69B2F275E6FF32-8012

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels:. 8K0-907-379-V1.clb
   Part No SW: 8K0 907 379 CK    HW: 8K0 907 379 CK
   Component: ESP8 quattro  H09 0100  
   Revision: --------    Serial number: --------------
   Coding: 2D1D18
   Shop #: WSC 02391 823 56573
   VCID: 045171975E11B577560-8050

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels:. 8K0-907-064-05.clb
   Part No SW: 8K0 907 064 FL    HW: 8K0 907 064 FL
   Component: BCM2 2.0      H10 0602  
   Revision: 00002001    
   Coding: 09830000000000000000
   Shop #: WSC 02399 823 56573
   VCID: 7F5BFE7B37F7D6AF0B2-802A

   Subsystem 1 - Part No SW: 8T0 959 754 A    HW: 8T0 959 754 A
   Component: FBSAUDIB8 IDG  H60 0072 
   Serial number: 0812000051324017    

   Subsystem 2 - Part No SW: 8K0 905 852 E    HW: 8K0 905 852 E
   Component: J764 ELV MLB  H40 0046 
   Serial number: 2312000060609015    

No fault code found.

-------------------------------------------------------------------------------
Address 06: Seat Mem. Pass (J521)       Labels:. 8T0-959-760.clb
   Part No SW: 8T0 959 760 E    HW: 8T0 959 760 E
   Component: MEM-BFS       H10 0076  
   Revision: AA000000    Serial number: 00000026233564
   Coding: 08037025002400001000
   Shop #: WSC 02391 823 56573
   VCID: 45D7AC9315AB4C7F01E-8010

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: Redir Fail!
   Part No SW: 8K1 820 043 N    HW: 8K1 820 043 N
   Component: KLIMA 3 ZONEN H04 0123  
   Revision: C1000000    Serial number: 01250320121949
   Coding: 6483208000
   Shop #: WSC 02391 823 56573
   VCID: 3333E24B4B3FC2CFBFA-8066

2 Faults Found:
00457 - Control Module for Network (J519) 
            013 - Check DTC Memory
             Freeze Frame:
                    Fault Status: 01101101
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 126
                    Mileage: 79317 km
                    Time Indication: 0
                    Date: 2018.03.19
                    Time: 10:23:55

00256 - A/C Pressure/Temperature Sensor (G395) 
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 7
                    Fault Frequency: 1
                    Reset counter: 126
                    Mileage: 79317 km
                    Time Indication: 0
                    Date: 2018.03.19
                    Time: 10:23:55

             Freeze Frame:
                    Temperature: 19.0°C


-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels:. 8K0-907-063.clb
   Part No SW: 8K0 907 063 DF    HW: 8K0 907 063 AF
   Component: BCM1 1.0      H14 0103  
   Revision: 06014001    Serial number: 00000398869202
   Coding: 26000091863CAFC00000480300003D0D0F1C528822090221000008000000030100000040000000
   Shop #: WSC 05151 444 125825
   VCID: 76B51B5F18CD97E7584-8022

   Subsystem 1 - Part No SW: 8F1 955 119     HW: 8K1 955 119   Labels: 1KX-955-119.CLB
   Component: WWS 260312  H07 0021 
   Serial number: SWF12030265164      
   Coding: 00FD11

   Subsystem 2 - Part No SW: 8U0 955 559 B    HW: 8U0 955 559 B  Labels: 8U0-955-559.CLB
   Component: G397_RLFS  H06 0002 
   Serial number: 20210241            
   Coding: 02005D

   Subsystem 3 - Part No SW: 8K0 941 531 AS    HW: 8K0 941 531 AS
   Component: E1 - LDS  H03 0031 
   Serial number: 00000000001503123416

   Subsystem 4 - Part No SW: 4G0 907 410 A    HW: 4H0 907 410 A
   Component: USHL4.2  H30 0030 
   Serial number: 0000002274555R1C6Y02

   Subsystem 5 - Part No SW: 4H0 907 658     HW: 4H0 907 658 
   Component: AQ_Hum_Sensor  H02 0002 
   Serial number: C5284F16000000000001

1 Fault Found:
00256 - A/C Pressure/Temperature Sensor (G395) 
            004 - No Signal/Communication
             Freeze Frame:
                    Fault Status: 01100100
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 126
                    Mileage: 79317 km
                    Time Indication: 0
                    Date: 2018.03.19
                    Time: 10:23:55


-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels:| 8F0-959-655.clb
   Part No SW: 8F0 959 655 E    HW: 8F0 959 655 E
   Component: AirbagVW-AU10 H12 0430  
   Serial number: 003KKD8008C+  
   Coding: 303741353731303030304A55304C38463053
   Shop #: WSC 02135 785 00200
   ASAM Dataset: EV_AirbaAU10SMEAU485 001004
   ROD: EV_AirbaAU10SMEAU485.rod
   VCID: 3A2DCF6F6CD533877CC-806E

   Seat occupied recognition: 
   Subsystem 1 - Part No SW: 8K0 959 339 A    HW: 8K0 959 339 A
   Component: BF-Gewichtss.  H02 0060 
   Serial number: 5810000R1200007U2Z

   Crash sensor for side airbag: driver side: 
   Serial number: 6334MSME6A01105FB

   Crash sensor for side airbag: front passenger side: 
   Serial number: 6344MSME6C355910F

   Crash sensor for side airbag: rear: driver side: 
   Serial number: 6352QSME3E101C58L

   Crash sensor for side airbag: rear: passenger side: 
   Serial number: 6362QSME1A101C5EM

   Crash sensor for front airbag: driver side: 
   Serial number: 63732SME7A0E09501

   Crash sensor for front airbag: front passenger side: 
   Serial number: 63832SME4F101270U

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels:. 8K0-953-568.clb
   Part No SW: 8K0 953 568 L    HW: 8K0 953 568 L
   Component: Lenks.Modul   H03 0004  
   Revision: --------    Serial number: 90372LCL001R1 
   Coding: 000016
   Shop #: WSC 02391 823 56573
   VCID: 43D3B28B1B9F724F2FA-8016

   Component: E221 - MFL  H03 0003 

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels:. 8T0-920-xxx-17.clb
   Part No SW: 8T0 920 950 S    HW: 8T0 920 950 S
   Component: KOMBIINSTR.   H11 0540  
   Revision: 00200000    Serial number: MVD25L83D     
   Coding: 831719000301D705020000
   Shop #: WSC 02391 823 56573
   VCID: 48C9A5A722B95117FA8-801C

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels:. 8T0-907-468.clb
   Part No SW: 8R0 907 468 A    HW: 8R0 907 468 A
   Component: GW-BEM 5CAN   H10 0025  
   Revision: 1V040013    Serial number: 1341V1231980D9
   Coding: 00C303FF00
   Shop #: WSC 02391 823 56573
   VCID: 3D27C4737D7B04BF59E-8068

   Subsystem 1 - Part No SW: 8X0 915 181     HW: 8X0 915 181 
   Component: J367-BDM  H07 0141 
   Serial number: 00000000003790565626

No fault code found.

-------------------------------------------------------------------------------
Address 26: Auto Roof (J256)       Labels:| 8F0-959-255.clb
   Part No SW: 8F0 959 255     HW: 8F0 959 255 
   Component: VSG-AUDI-B8   H12 0190  
   Coding: 030000
   Shop #: WSC 02135 785 00200
   ASAM Dataset: EV_ElectRoofContr 001008
   ROD: EV_ElectRoofContr.rod
   VCID: 71BF28437123B0DF8D6-8024

No fault code found.

-------------------------------------------------------------------------------
Address 2E: Media Player 3 (R199)       Labels:. 8T0-035-785.clb
   Part No SW: 8T0 035 785 A    HW: 8T0 035 785 
   Component: SG ext.Player H08 0290  
   Revision: 00000000    
   Coding: 020302
   Shop #: WSC 02391 823 56573
   VCID: 392FD0636953389F756-806C

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr (J136)       Labels:. 8T0-959-760.clb
   Part No SW: 8T0 959 760 E    HW: 8T0 959 760 E
   Component: MEM-FS        H10 0076  
   Revision: AA000000    Serial number: 00000026293827
   Coding: 08037125002400001000
   Shop #: WSC 02391 823 56573
   VCID: 45D7AC9315AB4C7F01E-8010

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels:. 8K0-959-793.clb
   Part No SW: 8T0 959 793 G    HW: 8T0 959 793 G
   Component: TSG FA        H09 0302  
   Revision: --------    Serial number: --------------
   Coding: 011C43724008332C03
   Shop #: WSC 02391 823 56573
   VCID: 4DC794B3CDDBB43FC9E-8018

No fault code found.

-------------------------------------------------------------------------------
Address 44: Steering Assist (J500)       Labels:| 8K0-909-144.clb
   Part No SW: 8K0 909 144 F    HW: 8K0 909 144 B
   Component: RCEPS         H36 0507  
   Revision: 00001000    Serial number: 0025332093
   Coding: 100000000001
   Shop #: WSC 16994 001 1048576
   ASAM Dataset: EV_RCEPSAU48X 008014
   ROD: EV_RCEPSAU48X_008.rod
   VCID: 3431E1574EB1C5F7A60-8060

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels:. 8K0-907-064-46.clb
   Part No SW: 8K0 907 064 FL    HW: 8K0 907 064 FL
   Component: BCM2 2.0      H10 0602  
   Revision: 00002001    Serial number: 0173782176    
   Coding: 010602BA00FA402080B0033200000000
   Shop #: WSC 02391 823 56573
   VCID: 7F5BFE7B37F7D6AF0B2-802A

   Subsystem 1 - Part No SW: 8F0 959 719 B    HW: 8K0 959 719 
   Component: GTO BF  H01 0080 
   Serial number: 00000000000000782025

   Subsystem 2 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H05 1501 

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System (J525)       Labels:. 8T0-035-223-ASC.clb
   Part No SW: 8T0 035 223 AH    HW: 8T0 035 223 
   Component: DSP STD       H07 0230  
   Revision: S2500000    
   Coding: 0203010102
   Shop #: WSC 02391 823 56573
   VCID: 74B121570EB185F7660-8020

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels:. 8K0-959-792.clb
   Part No SW: 8T0 959 792 G    HW: 8T0 959 792 G
   Component: TSG BF        H09 0302  
   Revision: --------    Serial number: --------------
   Coding: 011C43324C08332C03
   Shop #: WSC 02391 823 56573
   VCID: 4CC199B736C1BD37DE0-8018

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (----)       Labels: 8K0-907-801-V2.clb
   Part No SW: 8K0 907 801 J    HW: 8K0 907 801 J
   Component: EPB-4         H01 0001  
   Revision: --------    Serial number: 00000000037113
   ASAM Dataset: EV_ParkiBrake 001022
   ROD: EV_ParkiBrake_AU48.rod
   VCID: 3635DB5F58CDD7E7984-8062

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio (J503)       Labels:. 8Tx-035-1xx-56.clb
   Part No SW: 8R1 035 186 B    HW: 8R1 035 186 B
   Component: Con3 Sirius   H08 0451  
   Revision: 00000009    Serial number: AUZ5Z6L1723513
   Coding: 04020002010305004359070800
   Shop #: WSC 02391 823 56573
   VCID: 3431E1574E31C5F7A60-8060

   Subsystem 1 - Part No SW: 8T0 919 603 G    HW: 8T0 919 603 G
   Component: Display  

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left (J388)       Labels:. 8K0-959-795.clb
   Part No SW: 8T0 959 795 F    HW: 8T0 959 795 F
   Component: TSG HL        H08 0302  
   Revision: --------    Serial number: --------------
   Coding: 010C03304008372C03
   Shop #: WSC 02391 823 56573
   VCID: 4EC593BFC0DD8F27B04-801A

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right (J389)       Labels:. 8K0-959-794.clb
   Part No SW: 8T0 959 795 F    HW: 8T0 959 795 F
   Component: TSG HR        H08 0302  
   Revision: --------    Serial number: --------------
   Coding: 010C03304008372C03
   Shop #: WSC 02391 823 56573
   VCID: 4EC593BFC0DD8F27B04-801A

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 8P0-862-335.lbl
   Part No SW: 8T0 862 336 F    HW: 8T0 862 336 E
   Component: FSE_256x BT     H45 0660  
   Revision: 00000000    Serial number: 00000005262643
   Coding: 0010370
   Shop #: WSC 02335 785 00200
   VCID: 3E25C37F7C7D1FA7404-806A

No fault code found.
 
   #2  

Jack@European_Parts

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Hello Op and welcome to the VCDS forum.

Check LIN to AC switch and fuses + verify the switch is correct part number and actual Freon level is correct.

Correct gateway error.......by verifying twisted pair is ok and blocks report the AC controller to 0x19 and 0x09.

Verify all shared sensors for tracks with LIN are correct part number and in working order with G395

JPPSG

http://forums.ross-tech.com/showthr...essional-Problem-Solver-Guide-quot-JPPSG-quot
 
   #3  

Jef

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The G395 is a simple 3 wire sensor, looks to be located on the left side of the condenser. /1 is ground, /3 is power and /2 is data over a LIN Bus. Unplug the sensor and with an incandescent test light, verify there is good power/ground at /1 + /3.

Also, I've seen cases where the J530 Garage Door Opener can cause issues with the A/C since it is on the same LIN Bus as the G395 sensor. The J530 is a small black box just behind the Audi badge on the grill, unplug it and see if you can then clear the fault code for the G395.
 
   #4  

esrandl

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Jack, Jef,
Thanks for help.

so I tried the easy stuff: Checked fuses (fine), disconnected J530 (no luck) and checked the connector for G395 for power. Pin 1 and 3 produce approx 13V when grounded, pin 2 produces approx 0.5V if that makes any difference. Took an ohm meter to both my old and new G395 sensor and I get infinite ohms with any pin pair connection. I assume the switch requires pressure to close and give a different reading. I do have a compressor and can set whatever pressure I want, but not sure how to make the fitting work. Is there any way to easily check G395 sensor? I am suspicious my new sensor could also be a problem. Bought on ebay as 'new other' with claim it was new but not in original box. Looks a little beat up(?) but clean and marks look OEM and part number is: 4H0929126 which should be part unless I made a mistake.

I did buy a legit shop manual, can dig into the HVAC service and wiring diagrams. I have a standard a/c gauge set and the high/low side pressures seem normal when compressor cycled in VCDS, is there a way to confirm R134 volume other than evacuate and refill correct amount? I don't have any way to recapture but I can vacuum system so was hoping to avoid refilling unless absolutely necessary. Incidentally, this is my first Audi so I am in new territory on some of this.

I have no problems changing components, but not sure how to "Correct gateway error.......by verifying twisted pair is ok and blocks report the AC controller to 0x19 and 0x09." I am guessing I need to find the specific twisted pair on wiring diagram and then confirm continuity to...?
 
   #5  

esrandl

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I should also add: when A/C is manually tested through VCDS, it cycles repeatedly. I think this is normal like other cars that don't always run compressor continuously. High side goes up, low side drops when this happens. Stays that way for approx 6-10 sec, then cycles off for same amount of time without me doing anything in VCDS.
 
   #6  

Jef

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Bought on ebay
:facepalm:

Lets unplug the G395 sensor and also unplug the J530 Garage Door Opener. Ohm test from /2 of the G395 sensor to /2 of the J530 Garage Door Opener. This should be a yellow/grey wire. If you get pretty much a dead short, then the data wire for the G395 is good. You imply you have power/ground already for the sensor... so if that data wire checks out good, go to the Audi dealer and get a new G395 sensor.
 
   #7  

esrandl

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2.1 Ohms.... off to the dealer!

":facepalm:" yes, I agree.
 
   #8  

esrandl

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Some follow up:

Got a legit G395 at dealer (>$130..). I didn't want to chance getting a counterfeit or non working sensor. Turns out the prior sensor I got "new other" on Ebay wasn't working so it was the problem (as was the original failed sensor), so getting a real OEM sensor solved the issue. All is good now. Thanks Jef for helping sort out that the connections seemed to work as I didn't want to pop for an expensive sensor if that wasn't the issue.

Hope this helps some others, it is a super easy fix... but probably worth popping for a legit new OEM sensor.
 
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