B2561 – OBD-II DTC

OBD-II DTC B2561 – Aux A/C Blower Speed 1 Circuit Failure

DTC B2561 meaning

DTC B2561 refers to an issue with the Auxiliary A/C Blower Speed 1 Circuit. This diagnostic trouble code indicates that the vehicle’s onboard diagnostic system has detected a malfunction in the circuit responsible for controlling the first speed setting of the auxiliary air conditioning blower. The auxiliary A/C system is typically used to provide additional cooling in the cabin, especially in larger vehicles or those with rear air conditioning systems.

DTC B2561 symptoms

Common symptoms associated with DTC B2561 may include:

• Inoperative auxiliary A/C blower at speed 1
• Reduced airflow from the auxiliary A/C system
• Unusual noises from the blower motor
• Inconsistent blower operation at different speeds
• Dashboard warning lights related to the A/C system

DTC B2561 causes

Several factors can lead to the triggering of DTC B2561, including:

• Faulty blower motor
• Damaged or corroded wiring in the blower speed circuit
• Defective blower motor resistor
• Issues with the A/C control module
• Faulty connectors or terminals

DTC B2561 seriousness

The seriousness of DTC B2561 can vary based on the symptoms experienced. While it may not pose an immediate safety risk, it can lead to inadequate cabin cooling, especially in hot weather. If left unaddressed, it may result in further damage to the A/C system or other related components, leading to more costly repairs.

How to diagnose DTC B2561

To diagnose DTC B2561, follow these steps:

1. Use an OBD-II scanner to confirm the presence of DTC B2561.
2. Inspect the auxiliary A/C blower motor and its wiring for visible damage or corrosion.
3. Check the blower motor resistor for proper operation.
4. Test the A/C control module for any faults or communication issues.
5. Perform a continuity test on the wiring harness to ensure there are no breaks.
6. Verify the operation of the blower motor at different speeds using a direct power source.

How to fix DTC B2561 step-by-step instructions

To fix DTC B2561, follow these step-by-step instructions:

1. Disconnect the vehicle’s battery to ensure safety while working on the electrical system.
2. Inspect and repair any damaged wiring or connectors in the blower speed circuit.
3. Replace the blower motor if it is found to be faulty during testing.
4. Replace the blower motor resistor if it is not functioning correctly.
5. Reconnect all connectors and wiring, ensuring they are secure and free of corrosion.
6. Reconnect the battery and clear the DTC using an OBD-II scanner.
7. Test the auxiliary A/C system to ensure proper operation at all blower speeds.

How to erase DTC B2561

To erase DTC B2561, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the vehicle’s ignition without starting the engine.
3. Navigate to the DTC menu on the scanner and locate DTC B2561.
4. Select the option to clear or erase the trouble code.
5. Turn off the ignition and disconnect the scanner.
6. Start the vehicle and monitor for any reoccurrence of the code.