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Unusual noise and metallic grinding when A/C is on

Q: What are the symptoms of Unusual noise and metallic grinding when A/C is on in Toyota Lexus RZ450e?

Unusual noises when A/C is turned on. Frost or ice on pipes under the hood

Q: How to fix Unusual noise and metallic grinding when A/C is on in Toyota Lexus RZ450e?

Official manufacturer's service campaign (September 2025). Updating the air conditioning/engine controller software to change the operating pressure management logic and physically replacing the damaged electric compressor with a modernized model.

in Toyota Lexus RZ450e (2022-2025)

Symptoms

Unusual noises when A/C is turned on
Frost or ice on pipes under the hood

DTC error codes

Electric Compressor Pressure Limits Exceeded

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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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