GM Electronic Parking Brake Service Mode Reset

How to Reset GM Electronic Parking Brake (EPB) Service Mode: Resetting the Electronic Parking Brake (EPB) service mode on a General Motors (GM) vehicle is essential after performing maintenance tasks like brake pad replacement or rear caliper servicing. This procedure varies slightly depending on the GM model (Chevrolet, GMC, Buick, Cadillac), but the general steps are similar.

When to Use Service Mode

• Replacing rear brake pads

• Servicing rear calipers

• Preventing damage to the EPB motor

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Step-by-Step Guide to Exit EPB Service Mode

Method 1: Using the Brake Pedal and Parking Brake Switch (for some GM models)

1. Turn on ignition (without starting the engine).

2. Press the brake pedal and hold.

3. Pull and hold the EPB switch (the parking brake lever) up for about 5–10 seconds.

4. The EPB should automatically re-engage and exit service mode.

5. You may hear the motor activate; this indicates the EPB is returning to normal operation.

6. Release the brake pedal.

7. Start the engine and test the parking brake to ensure it’s functioning correctly.

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Method 2: Using a Diagnostic Tool (Scan Tool/OBD2)

For newer or more advanced GM models, a scan tool may be required to reset service mode.

1. Connect a compatible OBD2 scan tool that supports EPB functions.

2. Navigate to:

   • Chassis > Electronic Parking Brake > Functions > Exit Maintenance Mode

3. Select Exit Service Mode or Apply Parking Brake.

4. Wait for the EPB motor to complete its cycle.

5. Confirm that there are no warning lights on the dashboard.

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Notes:

• If the EPB doesn't reset, check for stored fault codes using a scan tool.

• In some cases, turning the ignition off and on again after exiting service mode helps.

• Always ensure the battery is fully charged, as EPB motors draw significant power.

• Consult the owner’s manual or a service manual for model-specific instructions.

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Let me know your exact GM model and year if you need steps tailored to it.