What are the symptoms of Slow loss of refrigerant or A/C system leakage in Volkswagen SQ5?

No cold air from vents. Problem visible at standstill or in traffic

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Slow loss of refrigerant or A/C system leakage

Q: How to fix Slow loss of refrigerant or A/C system leakage in Volkswagen SQ5?

Replacement of the G395 sensor with an improved version and repair/isolation of the LIN harness. If your Audi consumes electricity and does not have air conditioning, disconnect the air conditioning pressure sensor. If the power consumption drops, you have the culprit. This is a manufacturing defect described in the TSB.

in Volkswagen SQ5 (2007-2014)

Symptoms

No cold air from vents
Problem visible at standstill or in traffic

DTC error codes

DTC 00457

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Technical diagnosis (Premium)

Recognized technical fault:

Auxiliary controller voltage instability detected

Technical analysis

Detailed analysis of HVAC controller operation parameters, CAN bus data readings, and diagnostic signal waveforms. Purchase PRO access or log in to read the full fault analysis.

Confirmed solution

Complete step-by-step repair procedure including module non-volatile memory reset, sensor calibration, and correct wiring routing. Unlock the full report to see the instruction.

Parts needed

Filters ferrite anti-interference / noise suppressor
Auxiliary starting battery (depending on cell status)

Workshop hacks

Important workshop tips for mechanics regarding bypasses without expensive control module replacement and manufacturer software service bulletins.

TSB / TPI service bulletins

TSB-24-HVAC-01TPI-2068943/2

A/C Technical Specifications

Refrigerant specifications for this model are available in the catalog.

Open refrigerant database

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