AutoCodes – Generic – P2561

P2561 Code - Air Conditioning Control Module Requested MIL Illumination

Quick Answer

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. Common causes include Problems with the A/C system, Check Air Conditioning Control Module for codes, Faulty Air Conditioning Control Module. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P2561 indicates Air Conditioning Control Module Requested MIL Illumination.
Common causes: Common causes include Problems with the A/C system, Check Air Conditioning Control Module for codes, Faulty Air Conditioning Control Module.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 8,899

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2561 Description

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. If a condition is detected, the module sets a Diagnostic Trouble Code (DTC) and sends a serial data message to the Engine Control Module (ECM). The ECM sets a DTC to inform that the module has set a DTC. The serial data message sent by the module also contains a request for the ECM to illuminate the Malfunction Indicator Lamp (MIL).
The DTC will be set when the ECM receives a serial data message from the Air Conditioning Control Module indicating that DTC has been set in the module.

OBDII Code P2561 - Air Conditioning Control Module Requested MIL Illumination - AutoCodes.com — P2561 Code - Air Conditioning Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P2561?

Problems with the A/C system
Check Air Conditioning Control Module for codes
Faulty Air Conditioning Control Module

How to Fix the DTC P2561?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2561 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P2561 Buick — Air Conditioning Control Module Requested MIL Illumination
P2561 Cadillac — Air Conditioning Control Module Requested MIL Illumination
P2561 Chevrolet — Air Conditioning Control Module Requested MIL Illumination
P2561 Dodge — A/C Control Module Requested MIL Illumination
P2561 GMC — Air Conditioning Control Module Requested MIL Illumination

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.