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Air conditioning stopped cooling / no response to AC button

Q: What are the symptoms of Air conditioning stopped cooling / no response to AC button in Hyundai Ioniq 5?

Problem appears while driving. Irregular A/C operation. A/C does not react to control panel settings. Reduced range or EV heating issue

Q: How to fix Air conditioning stopped cooling / no response to AC button in Hyundai Ioniq 5?

ECU/HVAC software update (TSB MC-10241804-0001). If the system is contaminated with PAG oil - replace the pump and perform extreme flushing with a dedicated station for POE oil. Don't let electricians get under the machine of combustion cars! PAG oil conducts electricity. A drop of PAG from a service technician's hose will kill a 400V compressor costing PLN 10,000, causing current breakdown errors.

in Hyundai Ioniq 5

Symptoms

Problem appears while driving
Irregular A/C operation
A/C does not react to control panel settings
Reduced range or EV heating issue

DTC error codes

Diagnostic Trouble Codes - HV Protocol

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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

AE (1.6 Hybrid / Plug-in)

Refrigerant: R1234yf Amount (g): 600g Oil: POE (nieprzewodzący) Oil (ml): 130ml

AE (Electric bez pompy)

Refrigerant: R134a Amount (g): 550g Oil: POE (nieprzewodzący) Oil (ml): 130ml

AE (Electric z pompą ciepła)

Refrigerant: R134a Amount (g): 1000g Oil: POE (nieprzewodzący) Oil (ml): 180ml

See full specification

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Air conditioning stopped cooling / no response to AC button

Symptoms

DTC error codes

A/C Technical Specifications

Other problems in Ioniq 5

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