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I have a 2013 Chevrolet Avalanche Black Diamond LTZ,my tail lights work sometimes & then randomly stop working, help!

The tail lights will stop working sometimes for weeks at a time and then randomly work again for days or weeks then stop working again. I can never trust driving my vehicle after dark because I never know when they will stop working. Brake lights, back up lights, blinkers and hazards all work as do my day runner lights on the front.

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  • Linda Jones
    Linda Jones Oct 19, 2019

    ALL lights work except tail lights. All day runners work except tail lights. If I manually turn lights to on position the tail lights still do not work. License plate lights work. Hazards, blinkers, reverse, all work. When key fob lock & unlock are pressed all lights light up.

  • Linda Jones
    Linda Jones Oct 19, 2019

    Thank you to everyone responding. I appreciate any and all help.



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Did you happen to find small pieces of plastic in the driver's floorboard? If so you unwittingly found the problem. The brake light switch is mounted so its plunger presses against a small plastic insert. The insert is pushed into a hole in the break pedal arm. When the brake is not depressed it rests the the upmost position so when the insert (when intact and unbroken) does the pushing up against the brake light switch plunger. Check the condition of the insert in the brake pedal arm and replace if necessary.

Posted on Oct 18, 2019

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Tail lights, not brake lights.
If the vehicle has a tow bar fitted, it’s possible the trailer electrics have interfered with the wiring. Getting this removed or refitted may resolve it.
Also look at whether what you are seeing is the tail lights not working when the daylight running lights are on, but do work when you put headlights on. Try and check over every possible combination of running lights, side (parking) lights, dipped and main beam headlights, and what the state of the tail lights is for each.

Posted on Oct 18, 2019

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  • Linda Jones
    Linda Jones Oct 19, 2019

    Tail lights do not work regardless if the lights are set to automatic or turned to own position. All other lights work including license plate lights.

  • scj103 Oct 19, 2019

    As each number plate light is on the same circuit as it’s beighbouring tail light then you have either got two intermittent bulb units, a wiring fault from the ?cu, or mis wired towing socket electrics cutout switch.

  • scj103 Oct 19, 2019

    If locking and unlocking always powers them up, then the ecu is choosing not to illuminate. The programming and ecu state will need to be checked or investigated

  • Linda Jones
    Linda Jones Oct 20, 2019

    Thank you for the additional information to check out. I will look into later today. Thanks again!


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When the brake lights dont work find brake light switch on the brake padel arm under the dash unplug the switch and cross it out with a piece of wire and see if the lights work then if so its the switch if not the problem somewhere else

Posted on Oct 18, 2019

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Posted on Jan 02, 2017


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SOURCE: 2001 dodge neon tail lights inop

looking at your schematics and , you say tail lights don't work , you didn't mention if front parking lights and license plate lights are working , they all come from the same source , a black /yellow wire , a good clue if front work and rear don't , please advise .if fronts work then you have a open circuit somewhere between junction S118 (near breakout for left headlamp) and rear sockets.

Posted on Dec 31, 2008


  • 3 Answers

SOURCE: Tail lights but no blinkers or brake lights

there are two turn signal flashers under dash one on fuse box and one next to the light switch have to look up behind dash behind light switch for second I had same problem

Posted on Mar 17, 2009


Vincent G

  • 2361 Answers

SOURCE: tail lights not coming on. wiring problem

Just to be sure, check out the bulbs and sockets.
Make sure the two dots sockets (look into the base) is using two dot bulbs.
Check the single brake switch that activate by the brake.
If you has a meter then please check out the contact points.
Sometime this switch move out of aligment.
Dirt can also be part of the problem.
===== I will apply 12V power to the brake switch socket and make sure the blubs light to rule out wire problem first.
Please post more infor on the comment window.

Posted on Aug 23, 2009


  • 112 Answers


did you try to replace the bulb in the back normally when it blinks fast like that its just the bulb and its doulbe film thats why the brake and blinker dont work

Posted on Dec 19, 2009


  • 2841 Answers

SOURCE: blinker and hazard light problems

Replace the flasher relay. Sorry I cannot tell you where it is. Buy a new one so you will know what you are looking for.

Posted on Mar 03, 2010

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