RAM 1500 Brake Light Fault: How To Diagnose And Solve

By Nick Marchenko, PhD

Are you struggling with a pesky brake light fault in your RAM 1500? Worry no more! Follow this DIY guide to troubleshoot and fix the problem like a pro.

Initial Troubleshooting

First off, you need to understand the issue. If you're getting an error message about a brake light being out, but your truck sports LED lights, it can be a bit puzzling. The LEDs are usually long-lasting, so a burn-out is less likely.

Step 1: Inspect the LED Lights

• Start your truck and check if the error message pops up.
• Inspect all LED lights when the brakes are applied. Are they all lighting up? If some LEDs are out, that could be the culprit.

Step 2: Disassemble the Tail Light

• To inspect the tail light, you'll need a T20 bit.
• Remove the two bolts holding the tail light.
• Slide the tail light out for a closer look.

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Deeper Dive: Checking Wiring and Connections

Once you've got the tail light out:

• Examine the wiring and connectors. Everything should be snug and damage-free.
• If you've recently installed any aftermarket lights (like LED bed lights), ensure all connections are intact and correctly wired.

The Common Culprit: Third Brake Light Gasket

Often, the issue isn't with the LEDs themselves but with the third brake light, specifically its gasket.

Step 3: Inspect the Third Brake Light Gasket

• Remove any obstacles (like a bed cover) to access the third brake light.
• Check the gasket around the third brake light. Is it cracked or brittle? Water ingress through a damaged gasket can cause bulbs to burn out and trigger the error message.

Step 4: Replace the Third Brake Light Assembly

• Order a new third brake light assembly that matches your truck's LED setup. Online retailers like Amazon have a variety of options.
• Use a Phillips screwdriver to replace the third brake light.
• Install the new gasket provided with the assembly.

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Final Checks

After replacing the third brake light:

• Test the brake light functionality. Get someone to assist you by applying the brakes while you observe.
• Check if the error message on the dash disappears.

Wrapping Up

Fixing a brake light fault in a RAM 1500 can be a straightforward process if you know where to look. In most cases, a faulty third brake light gasket is to blame. Remember, regular maintenance and timely checks can save you from these small annoyances. Drive safe and keep your truck in top condition!

See also:

• How to Replace 2017 Ram 1500 Headlight Bulb;

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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