Service mode is a special feature that allows you to turn on your vehicle's electrical system without starting the engine. This is useful for a variety of tasks, such as working on the vehicle's electrical system, using the radio or other accessories, or charging the battery.

To activate service mode in a 2018-2024 GM Chevrolet truck or SUV, follow these steps:

1. Press and hold the brake pedal.
2. Press the start/stop button once.
3. Release the brake pedal.
4. Press and hold the start/stop button again for 5 seconds.
5. Release the start/stop button.

The vehicle will now be in service mode. The dashboard lights will be on and the accessories will be powered, but the engine will not be running.

To exit service mode, simply press the start/stop button once.

Here are some examples of when you might want to use service mode:

Working on the vehicle's electrical system, such as replacing the battery or installing a new accessory.
Using the radio or other accessories, such as the navigation system or climate control, while the vehicle is parked.
Charging the battery.
Programming the key fob.
Performing a diagnostic scan of the vehicle's computer system.

Safety tips:

Always be careful when working on the vehicle's electrical system. Disconnect the battery before making any repairs or modifications.
Never leave the vehicle in service mode unattended.
Be aware of your surroundings and make sure that the vehicle is parked in a safe location.

If you have any questions about using service mode in your 2018-2024 GM Chevrolet truck or SUV, please consult your owner's manual.

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