Volvo Bad Brake Light Switch Symptoms & Replacement

The brake light switch is a crucial component of the braking system in a Volvo vehicle. It is responsible for turning on the brake lights when the brakes are applied. If the brake light switch fails, it can result in several issues, including warning lights on the dashboard, decreased braking performance, and even a complete loss of braking ability.

It’s important to be aware of the symptoms of a bad brake light switch and to replace it promptly if it fails. Whether you are a professional mechanic or a do-it-yourselfer, this guide will give you the information you need to keep your Volvo braking system in good working order.

Symptoms

Symptoms of a bad brake light switch on a Volvo can range from the brake lights not working to the car refusing to go in gear.

• The brake lights don’t work.
• Cruise control won’t engage.
• Erratic automatic transmission shifting.
• Shifter won’t come out of Park.
• The engine won’t start.
• Brake switch high input code P0573
• The service engine light is on.
• The brake warning light illuminated.
• The brake light stays on.

How to Replace Volvo Brake Light Switch

What you will need

• Volvo brake light switch
• Torx socket set
• Ratchet wrench

Procedure

1. Park the Volvo and set the parking brake.
2. Remove the panel under the dashboard on the driver’s side. It is held in place with several T25 Torx screws. Pull the panel towards the back and lower it to remove it.
3. Locate the brake light switch.
4. Disconnect the electrical connector by pressing on the connector and pulling it out.
5. Next, you need to remove the brake light switch. Slide the white collar forward to allow the retaining clips to be released.
6. When applicable, adjust the new brake switch to match the length of the old one.
7. Install the new brake switch on the mounting brake. Ensure the switch plunger is fully extended.
8. Connect the electrical connector.

Verify that the brake lights are working correctly. If they stay on constantly, remove and adjust the brake light switch.

Troubleshooting

The YOUCANIC Full System Scanner can also diagnose brake light switch problems in your Volvo vehicle. It can also read and clear codes through every control module.

I replaced the brake light switch, but why am I still getting the MIL on the P0573 cruise control/brake light switch?

• This code may also be triggered by the brake travel sensor installed in the booster. Check the connection to the booster sensor and replace it if necessary. A damaged wire harness to the brake sensor is another problem that can trigger this code.

The brake lights won’t turn on unless I press the pedal hard.

• This may be due to the brake light switch needing to be adjusted. To fix the problem, access the brake light switch, remove it, and add it. Newer Volvo models have self-adjusting brake light switches, which means the only remedy would be to replace it.

What is the brake light switch used for?

• When the brake pedal is pressed, the brake light switch activates the brake lights. It is also used to turn the cruise control off and unlock the shift interlock solenoid in the gear shifter.

I replaced the brake light switch, but the brake lights still don’t work.

• Check the rear light warning module. First, inspect it for water damage. If there is no visible damage, use a Volvo scanner, like the YOUCANIC Full System Scanner, to read fault codes. The module is located in the luggage compartment on the rear side panel.

Check these troubleshooting and repair guides for more help on your Volvo.

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