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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?
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Verified VCDS User
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.
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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?
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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.
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NostraJackAss
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.
The more you know .........
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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.
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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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Hello DrPeter, I hope you are well.
In a UK forum (Briskoda.net) the question came up recently of what a G65 sensor will read when the refrigerant is all gone (i.e. the system is at atmospheric pressure). My gut feeling was that this situation was consistent with what he was seeing - a MVB reading of 0.0 bar. The guy came back with the quote from your post here about expecting a 1 bar reading at atmospheric pressure.
"Important to note about the G65 sensor:
- A reading of 0.0 bar would indicate an absolute vacuum
- At Sea Level (atmospheric pressure) the typical reading is 1.0 bar"
I've just checked with a new sensor plugged into the loom connection of a known working system, and see a reading of 0.0 bar with the sensor in free air. So I think the above quote may not be right?
This page [http://www.vwgolf.org/checking_pressures-1515.html] seems to state similar things to what you've summarised, but I think it is actually saying that G65 reads positive/gauge pressure rather than absolute, because of the reference to agreement with the figures in the table, which are in 'positive pressure' scale?
What do you think?
Cheers,
Pete
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Verified VCDS User
Good info here. My 2011 A4 problem was the G395 sensor too. Here’s what I saw:
- AC light on console would not stay on
- No compressor, no cold air
- Got a code for G395 Upper Limit Exceeded - Intermittent 29.3 bar
- An hour later, I saw G395 Lower Limit Exceeded – 0.0 bar (absolute pressure)
- Later G395 codes just said ERROR
- Pin 1 I had continuity to ground
- Pin 2 saw 9+ volts with the motor running
- Pin 3 saw battery voltage with motor running.
Hard to believe the 0.0 absolute pressure. That’s a perfect vacuum. Especially after the Upper Limit Exceeded code earlier that day.
After I swapped for the new G395 (updated part is 4H0 959 126 B), my VCDS showed about 12.9 bar instead of the "ERROR" reading I'd gotten the last 2 days. But the AC button still wouldn't turn on, and I had different error, 03023 Running-in Requirement 005 - No or Incorrect Basic Setting / Adaptation. The good news is that I had a pressure reading.
I went into 08-Auto/HVAC>Basic Settings>Compressor Run-In/Cooling check. Then click ON/Run. Heard the compressor spin right up and the radiator fans spooled up...cold air from the dash. Took a minute of that before it said "Performed" and the HVAC shut off on the dash. Turned it back on at the dashboard and have had cold air now.
Last edited by mtroxel; 08-13-2018 at 04:27 PM.
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