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Air conditioning stopped cooling / no response to AC button

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

Test the compressor thermal sensor outputs with an ohmmeter. In case of a short circuit inside the sensor (error B2993) - replace the small thermal fuse mounted directly on the compressor (it must not be completely bypassed/bridged in hybrids, as it may cause the coil to melt). If error B2992 occurs - locate and repair a broken wire in the harness leading to the sensor.

in Honda Civic Hybrid (2005-2016)

Symptoms

No cold air from vents

DTC error codes

B2992

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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

1,0 VTEC / 1,5 VTEC / 2,0 typ R

Refrigerant: R1234yf Amount (g): 430g Oil: POE PAO 68 AA1 Oil (ml): 100ml

1,6 iDTEC

Refrigerant: R1234yf Amount (g): 420g Oil: POE PAO 68 AA1 Oil (ml): 100ml

1,0 VTEC / 1,5 VTEC / 2,0 typ R

Refrigerant: R134a Amount (g): 430g Oil: ND8 PAO 68 AA1 lub PAG ISO 46 Oil (ml): 100ml

See full specification

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