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Air conditioning stopped cooling / no response to AC button

Q: How to fix Air conditioning stopped cooling / no response to AC button in Audi e-tron (GE)?

Physical replacement of the faulty integrated pressure and temperature sensor (OEM part number: 4M0 959 603 E) with a modernized version free from the manufacturing defect.

in Audi e-tron (GE) (2020-2022)

Symptoms

No cold air from vents

DTC error codes

G395 Sensor Communication Failure

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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

GE (Wszystkie wersje)

Refrigerant: R1234yf Amount (g): 800g Oil: POE (nieprzewodzący) Oil (ml): 180 - 220ml

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in e-tron (GE)

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