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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 Honda Fit EV?

No cold air from vents. Frost or ice on pipes under the hood

Q: How to fix Air conditioning stopped cooling / no response to AC button in Honda Fit EV?

Need to replace the high voltage electric compressor with a new OEM part. Thoroughly flushing the entire air conditioning circuit several times with a dedicated machine to completely remove the remains of conductive PAG oil and refilling the system with clean factor and a rigorously measured amount of POE oil.

in Honda Fit EV (2014-2026)

Symptoms

No cold air from vents
Frost or ice on pipes under the hood

DTC error codes

B151F49

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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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