2022-2024 Honda Civic A/C Control Module: Dual Zone Fitment and Programming Guide

Symptoms of a Failing A/C Control Module

When the A/C control module in a 2022-2024 Honda Civic begins to fail, you may experience a range of issues. Because the module controls the entire HVAC system, symptoms can vary from a complete shutdown to unpredictable behavior.

• Complete loss of A/C and heat: The most obvious symptom is when the entire climate control panel is dead and unresponsive. You won't be able to turn on the fan, A/C, or heat.
• Erratic or incorrect function: The system may do the opposite of what you command. For example, turning on the heat results in cold air, or the fan speed changes on its own.
• Blower motor stuck on one speed: You may find the fan is stuck on high or low, regardless of where you set the dial.
• Inability to change vents: The module controls the motors (actuators) that direct airflow to the floor, dash vents, or defroster. A failure can leave the airflow stuck in one position.
• Dual-zone temperature problems: One side of the cabin may be hot while the other is cold, and adjusting the temperature has no effect.
• A/C compressor not engaging: The module sends the signal to the A/C compressor to turn on. If this signal isn't sent, you'll get no cold air, even if the rest of the system seems to be working.

A professional scan tool can read specific Diagnostic Trouble Codes (DTCs) from the climate control system. Codes like B2964 (lost communication) 🎬 Watch this video on diagnosing the B2964 communication code. or others indicating open or shorted sensor circuits can point directly to a faulty module or related wiring.

Known Issues, TSBs, and Recalls for 2022-2024 Honda Civic

While there are no specific recalls for the A/C control module itself, Honda has issued service bulletins and warranty extensions for other A/C components on newer Civics that can cause similar symptoms.

• A/C Condenser Leaks: Honda has acknowledged issues with leaking A/C condensers on previous generation Civics (2016-2018) and has been investigating similar issues on 2022 models where the A/C blows warm due to refrigerant loss from the condenser.
• A/C Compressor Shaft Seal Leaks: A warranty extension was issued for some Honda models due to a new type of refrigerant oil causing the compressor shaft seal to leak. This leads to a loss of refrigerant and cooling performance.
• Seized A/C Compressors: Honda has also investigated instances of seized A/C compressors on 2024-2025 Civics with the 1.5L engine.

These issues are important because they can be misdiagnosed as a control module problem. If your primary symptom is a lack of cold air, it's crucial to have the system checked for leaks before replacing expensive electronic components.

Buying a Used A/C Automatic Temperature Control Module

Purchasing a used OEM module is a cost-effective way to restore your climate control. However, careful verification is essential to ensure compatibility and avoid wasting time and money.

1. Match the Part Number Exactly

The single most important step is to match the part number on your original module. The primary part number for this application is 79600-T20-A61. Using a module with a different part number, even if it looks identical, will likely result in it not working correctly or at all.

2. Inspect the Used Part

When you receive the used module, inspect it carefully:

• Check the Connectors: Look for any bent, corroded, or broken pins in the electrical connectors.
• Look for Water Damage: Check for any signs of corrosion or water stains on the casing or circuit board. Water intrusion is a common cause of electronic module failure.
• Verify the Part Number Sticker: Ensure the sticker with the part number 79600-T20-A61 is present and legible.

3. Understand the Programming Requirements

Even with a correct, functioning used part, the installation may not be plug-and-play. Be prepared for the possibility that the module will need to be initialized or programmed to your vehicle's specific configuration.

Programming and Installation

The A/C control module is located on the right (passenger) side of the dashboard, typically behind the glove box area. Physical replacement involves removing the glove box and possibly some lower dash trim to access and unbolt the module.

Does this module need to be programmed?

Yes, it is highly likely that a replacement module will require programming or initialization. Honda states that whenever you install a new programmable control unit, you must update it. While some sources suggest many Honda modules come pre-programmed, this often applies to brand-new parts ordered by VIN. A used module from a different vehicle will likely need to be configured to communicate with your car's Body Control Module (BCM) and other systems via the CAN bus network.

This procedure is typically done using the Honda Diagnostic System (HDS) software. While some advanced independent shops may have this capability with a J2534 pass-thru device, a visit to a Honda dealership is often required to ensure the module is properly integrated with the vehicle. Failure to program the module can result in persistent error codes or a non-functional climate control system.

Cost Comparison

Frequently Asked Questions (FAQ)