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The air conditioning turns off randomly while driving

Q: What are the symptoms of The air conditioning turns off randomly while driving in BMW 7 Series PHEV (G12)?

Problem appears while driving. Irregular A/C operation. A/C does not react to control panel settings

Q: How to fix The air conditioning turns off randomly while driving in BMW 7 Series PHEV (G12)?

Programming the entire vehicle with the ISTA system to I-Level S15A-21-07-540 or higher. Replacing the panel does not solve the problem - a software update is necessary.

in BMW 7 Series PHEV (G12) (2019-2021)

Symptoms

Problem appears while driving
Irregular A/C operation
A/C does not react to control panel settings

DTC error codes

No codes

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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

(F01/F02/F04) silnik: N54/N63/N57/N74

Refrigerant: R134a Amount (g): 900g Oil: PAG PAO 68 lub PAG ISO 46 b.d. z Oil (ml): b.d.ml

(E65/E66)

Refrigerant: R134a Amount (g): 810g Oil: 81 229 407 724 PAO 68 lub PAG ISO 46 Oil (ml): 180ml

(E65/E66)

Refrigerant: R134a Amount (g): 800 – 820g Oil: 81 229 407 724 PAO 68 lub PAG ISO 46 b.d. Oil (ml): b.d.ml

See full specification

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