P0574 – OBD-II DTC

OBD-II DTC P0574 – Cruise Control/Brake Switch A Circuit High

DTC P0574 meaning

DTC P0574 refers to a diagnostic trouble code that indicates a problem with the cruise control or brake switch A circuit. Specifically, it signifies that the voltage level in the circuit is higher than expected. This can affect the functionality of the cruise control system, as it relies on accurate signals from the brake switch to disengage when the brakes are applied.

DTC P0574 symptoms

Common symptoms associated with DTC P0574 may include:

• Inoperative cruise control system
• Illuminated check engine light
• Unexpected disengagement of cruise control
• Brake lights may remain on

DTC P0574 causes

Several factors can lead to the triggering of DTC P0574, including:

• Faulty brake switch
• Wiring issues, such as shorts or open circuits
• Corroded or loose connectors
• Faulty cruise control module
• Malfunctioning engine control module (ECM)

DTC P0574 seriousness

The seriousness of DTC P0574 can vary. While it may not pose an immediate safety risk, it can lead to a lack of cruise control functionality, which can be inconvenient for long drives. Additionally, if the brake lights are affected, it may create a safety hazard for other drivers. Therefore, it is advisable to address this issue promptly.

How to diagnose DTC P0574

To diagnose DTC P0574, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0574 code.
2. Inspect the brake switch for proper operation and alignment.
3. Check the wiring and connectors for damage, corrosion, or loose connections.
4. Test the voltage at the brake switch to ensure it is within specifications.
5. Examine the cruise control module for faults or issues.
6. Clear the code and perform a road test to see if the code reappears.

How to fix DTC P0574 step-by-step instructions

To fix DTC P0574, follow these steps:

1. Inspect and replace the brake switch if it is faulty.
2. Repair or replace any damaged wiring or connectors.
3. Ensure all connections are secure and free of corrosion.
4. Test the cruise control module and replace it if necessary.
5. Recheck the brake switch operation after repairs.
6. Clear the DTC using an OBD-II scanner and perform a test drive.

How to erase DTC P0574

To erase DTC P0574, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn the ignition key to the “On” position without starting the engine.
3. Access the scanner’s menu and select the option to clear or erase codes.
4. Confirm the action and wait for the scanner to complete the process.
5. Disconnect the scanner and start the vehicle to ensure the code does not return.

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