Fault codes with AC system causing engine management light on

[TommyT]

Hi fellas, I have a weird intermittent fault which causes the dash to chime a message to be displayed and the engine management light to pop on. BUT less then a second later it all dissapears and the touran is back to normal. Its done this on a few occations now and once it starts doing it then it will do it for the rest of the journey seemingly every 8 minutes (got my son to time it) but restart will generally stop it doing it.

Its too quick to read the message that the dash displays and vcds shows no faults with anything except the AC system. I cleared them after last time and it was fine for 3 weeks but its now back so I think it has something to do with the problem. Any advice welcome!

Scan below:

                Address 08: Auto HVAC       Labels: 5G0-907-426.clb
Control Module Part Number: 5G0 907 426 R    HW: 5G0 907 426 R
  Component and/or Version: AC Manuell    H02 0907
           Software Coding: 02120104102100001000000000000000
            Work Shop Code: WSC 00028 028 00067
              ASAM Dataset: EV_ACManueBHBVW37X 003019 (VW37)
                       ROD: EV_ACManueBHBVW37X_SK48.rod
                      VCID: 3A7B041FBD01A792C7-806E
3 Faults Found:

590081 - Control Circuit for A/C Compressor
          B10A9 11 [008] - Short to Ground
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 142
                    Mileage: 43563 km
                    Date: 2016.12.20
                    Time: 15:40:24

                    Outside air temperature: 6.0 Ã,°C
                    Engine speed: 1600 /min
                    Compressor shut-off requirement: Compressor activation: malfunction in activation path
                    Compressor current: actual value: 0.000 A
                    Compressor current: specified value: 0.000 A

1048834 - Functional Limitation due to Energy Management
          B10CD 00 [008] -  -
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 7
                    Fault Frequency: 3
                    Reset counter: 104
                    Mileage: 42634 km
                    Date: 2016.11.30
                    Time: 20:49:11

                    Voltage terminal 30: 13.6 V
                    Auxiliary heater: in stages-Enabling for auxiliary heater operation: Enabling stage 2
                    Auxiliary heater: in stages-Act.value: 3
                    Auxiliary heater: in stages-Specified value: 3
                    Auxiliary heater: in stages-Specified value for control: 3

1048835 - Functionality limited due to Engine Control Module
          P1719 00 [008] - -
          Intermittent - Confirmed - Tested Since Memory Clear
             Freeze Frame:
                    Fault Status: 00000001
                    Fault Priority: 6
                    Fault Frequency: 7
                    Reset counter: 138
                    Mileage: 41694 km
                    Date: 2016.11.07
                    Time: 19:06:20

                    Voltage terminal 30: 13.7 V
                    Auxiliary heater: in stages-Enabling for auxiliary heater operation: Enabling stage 3
                    Auxiliary heater: in stages-Act.value: 1
                    Auxiliary heater: in stages-Specified value: 3
                    Auxiliary heater: in stages-Specified value for control: 3

[insanitybeard]

I'm speculating here but those fault codes could indicate an issue with the heater control panel itself (which I assume has the control module integrated into it) or an intermittent wiring fault. I was initially thinking that there may be a fault with the air con compressor but the other fault codes relate to the auxiliary heater, therefore I'd be looking at the control ecu / panel or wiring responsible for overall control of the heating/ cooling system rather than specific individual components. I may be wrong though!