Chevrolet Volt Brake Light Failure - Brake Lights Not Working Or Not Turning Off

By Nick Marchenko, PhD

Experiencing brake light issues in your Chevrolet Volt can be frustrating. This guide consolidates various community-driven tips and step-by-step instructions to help you troubleshoot and fix problems with the third brake light.

Step 1: Diagnosing the Issue

Check the Fuse

• Location: Start by checking the F10 fuse, which is located in the left side Instrument Panel Fuse Block.
• Action: Ensure the fuse is intact. If the fuse is blown, replace it. Remember, the third brake light is controlled by this fuse, along with other components such as the Body Control Module and License Plate Lamps.

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Test for Power

• Tools Needed: You'll need a multimeter or a test light.
• Procedure: Check for voltage at the brake light plug. If there is no voltage, you'll need to trace back through the circuit starting from the plug.

Step 2: Checking the Wiring and Connectors

• Inspect the Wiring: Look for any signs of wear, tear, or corrosion in the wiring leading to the third brake light.
• Check Connectors: Ensure that all connectors, especially at the third brake light assembly, are tight and free from corrosion. A common issue might be a disconnected plug, particularly the extension wire plug if the third brake light has been replaced recently.

Step 3: Accessing and Inspecting the Light Assembly

• Access: To inspect or replace the third brake light, you may need to remove the spoiler. This is usually held by bolts accessible from the sides of the vehicle.
• Physical Inspection: Examine the brake light assembly for any signs of damage or wear. Replace if necessary.

Step 4: Replacing the Brake Light Bulb

• Replacement: If diagnostics indicate that the brake light bulb itself is faulty, replace it with a new one. Ensure that you use a compatible light assembly for the Chevrolet Volt.
• Installation: While installing, make sure all connections are secure and that the light is properly aligned.

It is critical to make sure that you choose a bulb that is the right fit for your Chevy Volt's electrical system. If you need help selecting a brake light bulb for your vehicle (or any other bulb) - consult the chart below:

• 2019;
• 2018;
• 2017;
• 2016;
• 2015;
• 2014;
• 2013;
• 2012;
• 2011;

Additional Tips

• Consult the Owner’s Manual: Always refer to your vehicle’s owner’s manual for specific details regarding fuse locations, wiring diagrams, and specific procedures.
• Weather Sealing: Check and replace weather stripping and rubberized seals if necessary, as these can degrade over time and lead to moisture ingress, which might cause electrical issues.
• Professional Help: If you feel uncomfortable performing any of these tasks, or if the problem persists after your troubleshooting, it’s advisable to seek help from a professional mechanic.

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By following these steps, you should be able to address most common issues related to the third brake light failure in a Chevrolet Volt. Always take safety precautions when working on your vehicle’s electrical system.

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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