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Thread: Tisí the HVAC Season

  1. #31
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    Anyone have more information on Compressor code 12?

    Backstory:
    Started having AC issues last Fall (code 00819).. replaced the High Pressure sensor (What the original VCDS code said), no dice. Chased the issue.. replaced the RCV on the compressor, and the AC control unit in the dash.. never fixed the issue.

    Fast forward to now and I'm revisiting this issue.. found a crashed 2006 Jetta TDI and bought the compressor off it.. replaced the compressor, Same high pressure code, so I replaced the sensor again (replacing the new one I bought last year). This fixed the 00819 High Pressure sensor code!

    AC shop filled the Freon and everything.. now I'm getting a code 12 = Compressor OFF: Shut-Off requested by Engine Control. No fault codes...

    The compressor I replaced mine with was not an identical part. Even though it was off the same year/make/model jetta. Both compressors are Sanden. The original had a C-clip to remove the RSV valve, this one does not.
    Does the compressor version make a difference?
    Called O'rileys auto parts and they only have one version, so I'm leaning towards no..

    I do not know the source of my AC control unit - bought off ebay. It has the exact same buttons though, Climatic with heated seats.

    Sometimes I will see a code saying Refrigerant pressure too low, however the shop said they filled it to spec..

    AC Clutch Relay Control Circuit Output test: 3.91-4.23 BAR, no change with it On/Off

    Pictures of VCDS Output Screens:
    https://www.dropbox.com/s/wh3k9xrdo3p2bqs/1.png?dl=0
    https://www.dropbox.com/s/s1ghdy03kjzja91/2.png?dl=0
    https://www.dropbox.com/s/fumfxdzhwmudaws/3.png?dl=0

    Full VCDS Scan:
    Code:
    Tuesday,25,April,2017,17:10:35:16619
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 17.1.3.0 (x64)
    Data version: 20170320 DS267.7
    www.Ross-Tech.com
    
    
    VIN: 3VWST71K06M800471   License Plate: 
    
    
    Chassis Type: 1K (1K0)
    Scan: 01 03 08 09 0F 15 16 17 19 25 42 44 46 52 56 62 72 7D
    
    VIN: 3VWST71K06M800471   Mileage: 333110km-206984miles
    
    00-Steering Angle Sensor -- Status: OK 0000
    01-Engine -- Status: OK 0000
    03-ABS Brakes -- Status: OK 0000
    08-Auto HVAC -- Status: OK 0000
    09-Cent. Elect. -- Status: OK 0000
    0F-Digital Radio -- Status: Malfunction 0010
    15-Airbags -- Status: OK 0000
    16-Steering wheel -- Status: OK 0000
    17-Instruments -- Status: OK 0000
    19-CAN Gateway -- Status: Malfunction 0010
    25-Immobilizer -- 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
    56-Radio -- Status: Cannot be reached 1100
    62-Door, Rear Left -- Status: OK 0000
    72-Door, Rear Right -- Status: OK 0000
    7D-Aux. Heat -- Status: OK 0000
     
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 038-906-016-BEW.lbl
       Part No SW: 03G 906 016 AB    HW: 028 101 223 8
       Component: R4 1,9L EDC G000SG  7550  
       Revision: --H02---    Serial number: VWZ7Z0F3630183
       Coding: 0050071
       Shop #: WSC 66565 257 00032
       VCID: 63C5F2D3A215535994-8036
    
    No fault code found.
    Readiness: 0 0 0 0 X 
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 1K0-907-379-MK60-F.lbl
       Part No SW: 1K0 907 379 AA    HW: 1K0 907 379 AA
       Component: ESP FRONT MK60      0102  
       Revision: 00H13001    
       Coding: 0021122
       Shop #: WSC 00066 000 00000
       VCID: 71E9889B68E9F1C916-8024
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 1K0-820-047.lbl
       Part No SW: 1K0 820 047 JM    HW: 1K0 820 047 JM
       Component: Climatic PQ35   142 1212  
       Revision: 00142032    Serial number: 00000000000000
       Shop #: WSC 00000 000 00000
       VCID: 78FFB5BF0B93A081D1-802C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels: 3C0-937-049-23-M.lbl
       Part No SW: 3C0 937 049 D    HW: 3C0 937 049 D
       Component: Bordnetz-SG     H37 1002  
       Revision: 00H37000    Serial number: 00000000297865
       Coding: 14018E234004100000140000001400000008730B5C
       Shop #: WSC 08701 444 58591
       VCID: 2A5B5FF785BFC21197-807E
    
       Subsystem 1 - Part No: 1K1 955 119 C  Labels: 1KX-955-119.CLB
       Component: Wischer VW350  013  0402  
       Coding: 00063445
       Shop #: WSC 08701  
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 0F: Digital Radio        Labels: 8E0-035-593-SIR.lbl
       Part No SW: 8E0 035 593 D    HW: 8E0 035 593 D
       Component: SDAR SIRIUS     H03 0060  
       Revision: 00000000    Serial number: AUZ4Z7F1025245
       Shop #: WSC 00000 000 00000
       VCID: 2A5B5FF785BFC21197-807E
    
    1 Fault Found:
    01304 - Radio 
                008 - Implausible Signal
                 Freeze Frame:
                        Fault Status: 01101000
                        Fault Priority: 5
                        Fault Frequency: 1
                        Reset counter: 27
                        Mileage: 333098 km
                        Time Indication: 0
                        Date: 2000.00.00
                        Time: 10:46:52
    
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 1K0-909-605.lbl
       Part No SW: 1K0 909 605 P    HW: 1K0 909 605 P
       Component: 39 AIRBAG VW8R  032 7900  
       Revision: 03032000    Serial number: 0038FD04J0W8  
       Coding: 0013113
       Shop #: WSC 00066 000 00000
       VCID: 397970BB70197989EE-806C
    
       Subsystem 1 - Part No: 1K0 959 339 E
       Component: BF-Gewichtsens. 006 0005
    
       Subsystem 2 - Serial number: 6332MSME0D5E626CT
    
       Subsystem 3 - Serial number: 6342MSME0D1E757CV
    
       Subsystem 4 - Serial number: 6351HSME09376421%
    
       Subsystem 5 - Serial number: 6361HSME09374C72C
    
       Subsystem 6 - Serial number: 63727SME09264039-
    
       Subsystem 7 - Serial number: 63827SME0926610C/
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 16: Steering wheel        Labels: 1K0-953-549-MY8.lbl
       Part No SW: 1K0 953 549 AH    HW: 1K0 953 549 AH
       Component: J0527           034 0070  
       Coding: 0000021
       Shop #: WSC 00066 000 00000
       VCID: 78FFB5BF0B93A081D1-802C
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 1K0-920-xxx-17.lbl
       Part No: 1K0 920 953 D
       Component: KOMBIINSTRUMENT 3HL 4312  
       Coding: 0022203
       Shop #: WSC 08701 067 57207
       VCID: 2C5759EF8F4BDC2165-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway        Labels: 1K0-907-530-V1.clb
       Part No SW: 1K0 907 530 F    HW: 1K0 907 951 
       Component: Gateway         H10 0120  
       Revision:   H10       Serial number: 28001061240324
       Coding: 3D3F0B60071002
       Shop #: WSC 00066 000 00000
       VCID: 2A5B5FF785BFC21197-807E
    
    1 Fault Found:
    01304 - Radio 
                004 - No Signal/Communication
                 Freeze Frame:
                        Fault Status: 01100100
                        Fault Priority: 2
                        Fault Frequency: 42
                        Reset counter: 30
                        Mileage: 333098 km
                        Time Indication: 0
                        Date: 2000.00.00
                        Time: 10:46:57
    
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 1K0-920-xxx-25.clb
       Part No: 1K0 920 953 D
       Component: IMMO            3HL 4312  
       Shop #: WSC 03200 444 55817
       VCID: 2C5759EF8F4BDC2165-8078
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 42: Door Elect, Driver        Labels: 1K0-959-701-MIN2.lbl
       Part No: 1K0 959 701 K
       Component: Tuer-SG         024 2377  
       Coding: 0001269
       Shop #: WSC 00066 000 00000
       VCID: 36637B87410796F103-8062
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist        Labels: 1Kx-909-144-G2V2.clb
       Part No: 1K1 909 144 K
       Component: EPS_ZFLS Kl.5   D06 1701  
       Shop #: WSC 00000 000 00000
       VCID: 33654293527583D924-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels: 1K0-959-433-MIN.clb
       Part No: 1K0 959 433 AF
       Component:    KSG              0401  
       Coding: 137803483F29058F880F048051A0
       Shop #: WSC 00066 000 00000
       VCID: 74E7818F17FBC4E1FD-8020
    
       Subsystem 1 - Component:   Sounder n.mounted     
    
       Subsystem 2 - Component:       NGS n.mounted     
    
       Subsystem 3 - Component:      IRUE n.mounted     
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 52: Door Elect, Pass.        Labels: 1K0-959-702-MIN2.lbl
       Part No: 1K0 959 702 K
       Component: Tuer-SG         024 2377  
       Coding: 0001269
       Shop #: WSC 00066 000 00000
       VCID: 377D7683460D6FF918-8062
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio
    Cannot be reached
    
    -------------------------------------------------------------------------------
    Address 62: Door, Rear Left        Labels: 1K0-959-703-GEN2.lbl
       Part No: 1K0 959 703 D
       Component: Tuer-SG         021 2434  
       Coding: 0000144
       Shop #: WSC 00066 000 00000
       VCID: 3169489BA869B1C956-8064
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 72: Door, Rear Right        Labels: 1K0-959-704-GEN2.lbl
       Part No: 1K0 959 704 D
       Component: Tuer-SG         021 2434  
       Coding: 0000144
       Shop #: WSC 00066 000 00000
       VCID: 326B4797AD6F8AD12F-8066
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 7D: Aux. Heat        Labels: 1K0-963-235.lbl
       Part No SW: 1K0 963 235 E    HW: 1K0 963 235 E
       Component: PTC-Element         0404  
       Revision: 00800000    Serial number:               
       Shop #: WSC 00000 000 00000
       VCID: 2D5154EBB451D52972-8078
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 01:43)--------------------------

    Thoughts? What can cause a code 12?

  2. #32
    Verified VCDS User Zenerdiode's Avatar
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    Hmm, 12 is usually a 'fleeting' code; it is a shut-off command from the ECU when it requires the engine to provide its highest power or torque. On my old Audi A4 (B5 8D model) you could only see code 12 during a log session when accelerating pretty hard.

    On the old 'B5, before messages being sent over CAN; there was a dedicated pair of wires from the ECU to the HVAC head which sent this shutdown signal. It's worth checking what your setup uses with Wiring Diagrams and checking the integrity of those wires if you have them.

  3. #33
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    Update:

    Replaced the AC control panel in the dash with the Original one from the car - A/C Started working!
    It initially threw a code for Low pressure, however I cleared that and it didnt come back.
    I drove ~3 hours, mostly at highway speeds yesterday, with working AC. It was 75+ degrees outside.

    Today, (55 degrees outside, Ohio right?) I took it back to the shop I have been working with, and they could not get the A/C to turn on. it is giving a constant Code of 299, Low Pressure. The Compressor Cutoff code is 3.
    When I check it with VCDS, the Pressure Sensor is showing 0.0 bars, with the car off or running - doesn't matter. My research says that means absolute Vacuum? What would that point to?

  4. #34
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    "
    2012 and newer Jetta sedans may have a customer concern of A/C shutting off when coming to a stop. When checking the HVAC controller for the Compressor Shut off code, [12- Shut-Off requested by Engine Control] maybe found, this is usually considered normal, the ECM is programmed to command the HVAC controller to shut off the compressor to allow increased engine rpm/vacuum when braking, mostly when the engine is cold, pre-catalyst operating temperature."

    I have this problem on a 2012 jetta is it possible to code the 'shutting down' out? Thanks.

  5. #35
    NostraJackAss Jack@European_Parts's Avatar
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    Believe it or not a CAN com error or disruption from cluster or bad cluster on BUS can cause this and with no error especially if someone was handy with China Town tools!

    In this case the radio is shooting a CAN error and because it tries to store and make a handshake for the cluster + PIN to authenticate it this may cause the issue.

    Sometimes I run an isolated twisted pair from cluster to climate control and bam AC is back in business.

    A flaky gateway can also cause this issue.

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  6. #36
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    Thanks for the reply but I did not make myself very clear this happens only for a few seconds at the time of braking unfortunately the ambient temperature is so high here that it makes a lot of difference.

  7. #37
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    With the code 08 (outside temperature too cold) what is the sensor to fix? Have the outside temperature (filtered) at 0 Celsius. Where's the sensor?

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