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  1. #1

    Angry Turn Signal Issue

    A recent problem has presented itself with my 04 Silvy. When I turn on my left turn signal, both signals flash. Does anybody know what the problem could be before I start tearing things apart? Yesterday it stopped after I turned my hazards on and then off but today that didn't work for me. Thanks in advance...


    The fool learns not from the wise man, but the wise man from the fool.

    2004 Silverado 4x4 (Suzie)
    6" Fabtech Suspension Lift
    35" NITTO Terra Grapplers
    18" MB Wheels Predators
    Thrush Turbo Series Mufflers
    on true dual exhaust
    Grille by Option Racing

    1952 3600
    Finally getting torn down to the frame.

  2. #2
    murdog94's Avatar
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    Feb 2008
    Cloquet, Minnesota, United States
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    Sounds like your turn signal unit is begining to go out. which isnt uncommon with these trucks.


    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3


    Mine was doing that for a bit, Did you just replace the bulbs? I was an idiot in a hurry at the parts store and grabbed the wrong bulbs...Not enough resistance I think? After I replaced them they started to blink at the same time, Got the right bulbs and it was fixed...Of course that was on a 1990 silverado, may not be the same for yours..Just a thought..
    1990 Silverado Stepside

    2003 Olds Alero-

  4. #4


    I haven't changed the bulbs recently. I can't decide what it is. It's happened a couple more times and if I turn the right signal on and then go back to the left signal it will usually fix itself. Also sometimes it will blink both signals once or twice but fix itself when I turn the wheel the slightest bit making me think it may be some sort of short in the steering column. I also read that it can sometimes be caused by the trailer lights adapter. Anybody heard of this?

  5. #5


    Greg (or anyone), what was the conclusion to this problem? I'm having the same issue with my '04 Silverado now. Thanks!!

    Steve - Maryland
    2004 Chevy Silverado 5.3 L V-8 4x4
    Access Roll-up Cover, Line-X bedliner, Billet grille & fog light covers,
    Tinted windows, Firestone Destination A/T tires, under-dash lights,
    USA Spec iPod interface, DU-HA under-seat storage, wish I could do more...

  6. #6


    Most likely the turn signal module. The replacements at Autozone and Advance are made by the original OE, most of the others are not...


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