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A/C cooling is weak and gradually loses performance

Q: How to fix A/C cooling is weak and gradually loses performance in Honda Clarity PHEV?

Checking the tightness using UV method or gas detector. If the leak occurs in the pipes (and is not the result of mechanical impact of scale), the condenser is replaced free of charge under the manufacturer's 10-year extended warranty. A modernized radiator is installed (part number: 80100-TBA-A01 or 80110-TBA-A02) and the system is filled with fresh refrigerant.

in Honda Clarity PHEV (2016-2021)

Symptoms

No cold air from vents

DTC error codes

Low Refrigerant Pressure

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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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