AC pressure sensor failure

[Hejdu]

Hi all,

I recently got a 2019 e-Golf and ran a full Vcds auto scan. It gave me a faulty pressure sensor 1, tried clearing the error but it returned immediately.

Address C5: Therm. mgt. (J1024) Labels:* None
Part No SW: 5GE 907 458 C HW: 5GE 907 458
Component: TME-Min H20 0203
Serial number: 0092721
Coding: 02
Shop #: WSC 00029 028 00019
ASAM Dataset: EV_ThermContrVISAU49X 001021
ROD: EV_ThermContrVISAU49X_VW37.rod
VCID: 45D75109652218F3FC5-8010

A/C pressure/coolant temperature sensor:
Subsystem 1 - Part No SW: 4M0 959 603 C HW: 4M0 959 603 C
Component: G395 pT-Sens1 H11 0010

Auxiliary Air Heater Control Module/PTC:
Subsystem 2 - Part No SW: 12E 963 231 G HW: 12E 963 231 G
Component: J848 HV-PTC H09 0208
Serial number: LR182743003810000282

A/C compressor sub:
Subsystem 3 - Part No SW: 5QE 816 803 E HW: 5QE 816 803 E
Component: J842 eKK H03 0010

A/C pressure/coolant temperature sensor 2:
Subsystem 4 - Part No SW: 4M0 959 603 C HW: 4M0 959 603 C
Component: G826 pT-Sens2 H11 0010

A/C pressure/coolant temperature sensor 3:
Subsystem 5 - Part No SW: 4M0 959 603 C HW: 4M0 959 603 C
Component: G827 pT-Sens3 H11 0010

A/C pressure/coolant temperature sensor 4:
Subsystem 6 - Part No SW: 4M0 959 603 C HW: 4M0 959 603 C
Component: G828 pT-Sens4 H11 0010

A/C pressure/coolant temperature sensor 5:
Subsystem 7 - Part No SW: 4M0 959 603 C HW: 4M0 959 603 C
Component: G829 pT-Sens5 H11 0010

Expansion valve 1 for refrigerant:
Subsystem 8 - Part No SW: 4M0 816 682 D HW: 4M0 816 682 D
Component: N636 EV1_KaMi H12 0102
Serial number: 00000000000120428433

Expansion valve 2 for refrigerant:
Subsystem 9 - Part No SW: 4M0 816 682 D HW: 4M0 816 682 D
Component: N637 EV2_KaMi H12 0102
Serial number: 00000000000120428449

Expansion valve 3 for refrigerant:
Subsystem 10 - Part No SW: 4M0 816 682 D HW: 4M0 816 682 D
Component: N638 EV3_KaMi H12 0102
Serial number: 00000000000120428426

Shut-off valve 1 for refrigerant:
Subsystem 11 - Part No SW: 4M0 816 703 B HW: 4M0 816 703 B
Component: V424 AV1_KaMi H12 0102
Serial number: 00000000000140428229

Shut-off valve 4 for refrigerant:
Subsystem 12 - Part No SW: 4M0 816 703 B HW: 4M0 816 703 B
Component: N642 AV4_KaMi H12 0102
Serial number: 00000000000140428227

Shut-off valve 5 for refrigerant:
Subsystem 13 - Part No SW: 4M0 816 703 B HW: 4M0 816 703 B
Component: N643 AV5_KaMi H12 0102
Serial number: 00000000000140424192

1 Fault Found
59031 - Refrigerant Pressure/Temperature Sensor 1
P1C59 00 [047] - Faulty
Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 3
Fault Frequency: 1
Mileage: 45190 km
Date: 2021.03.25
Time: 19:37:43

It looks like the ac system has 5 sensors, with Sensor 1 malfunction - see readout in picture, seems like it is only the pressure part:

Is this the G395 sensor and is it a known problem?

Thanks

 

[f1geek]

Have not heard of this before. Does your car heating and A/C work? If not, what error do you see on the dashboard?

 

[Hejdu]

The heater (heat pump) seems to work fine (I get hot air blowing and a warm car every morning when I leave my home), but here in Denmark the AC has not been tested yet - too cold. Nothing is showing up on dashboard.

It seems to be the sensor just after the compressor:

 

[f1geek]

Interesting. I wonder if the heat is being only provided by the PTC as I suspect that pressure sensor is required for the heat pump to work whether in a cooling cycle or heating cycle. I hope it is easy to replace.

 

[Cbh123]

I wonder what the result of this was?

My heat pump stopped working last week, It goes to the dealer on Tuesday.
According to VCDS, sensor 1,2,4 have all failed. I find it a bit unlikely that they all died simultaneously.

So I hope the techs have had their training - otherwise this could easily turn into a **** show

I wish i knew where these sensors are located, and had a wiring diagram.

 

[Cbh123]

After some new reading I see this in the self study guide
Failure Effects
If one or more sensors fail, the refrigerant pressure and the refrigerant temperature are determined using a map. The heating up phase for the vehicle interior is increased and an entry is made in the event memory

Other components mention shutting down of the system. So according to the SSG, the failed sensors should not shut down the system …hmmmm