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Thread: LLY Speedo buried past 120mph

  1. #1
    Join Date
    Jan 2002
    Location
    Kansas City, KS
    Posts
    31

    Default LLY Speedo buried past 120mph

    Last weekend when it was zero degrees, the speedo stuck at 76mph. It started out from there on my next trip and did it once more. It is now buried past 120mph. I have a 05 duramax lly. I have a juice module, so I know how fast I am going, and the odometer appears to be working okay so I am not too worried, but would like to get it fixed. Anyone else have this issue or know of an easy fix?

    Thanks for your help.
    2005 2500 D/A Ext. Cab 4x4 SLE LLY- Edge Juice w/Attitude and Predator. KN Cold Air intake, 5" exhaust, Kennedy Boost Stick

  2. #2
    Join Date
    Jul 2000
    Location
    Gilroy, California, United States
    Posts
    396

    Default

    This is a known issue across all GM trucks, do a search for speedo or gauges. My wife's 2005 1/2 ton Suburban had the same intermittent problem. I think GM came out with an extended warranty on this til 70 or 80k miles, of course ours was already over the mileage when it occurred and its intermittent so we didn't pursue it.
    mattb5150@hotmail.com

    1993 K2500 HD ext.cab 4x4 - SOLD

    2003 GMC K2500HD SLT EXTRA CAB/SB DMAX/ALLI, Bilsteins, Sulastic Shackles, Pitman & Idler braces, KD Headlight Harness, CAT filtration, Lift pump w/KD harness, Denali Door handles, Yukon exterior mirrors

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  3. #3
    Join Date
    Dec 2004
    Location
    Maryland
    Posts
    76

    Default

    GM has a special policy on this, But its for 03 and 04. However since this has been such an issue with vehicles that are in the 05 - 06 range GM may take care of it. Ask your dealer to contact his factory rep and ask for help.

  4. #4
    Join Date
    Jan 2002
    Location
    Kansas City, KS
    Posts
    31

    Default

    Battery was almost dead and tried starting, all gauges reset, speedo is working again.
    2005 2500 D/A Ext. Cab 4x4 SLE LLY- Edge Juice w/Attitude and Predator. KN Cold Air intake, 5" exhaust, Kennedy Boost Stick

  5. #5
    Join Date
    Mar 2000
    Location
    Loyal WI US
    Posts
    10,792

    Default

    For future reference, check out Florida Speedometer online. I have no experience with them, but have heard they do a good job of fixing these clusters.

    It sounds like you have weak batteries. I'd suggest replacing before they take out your alternator.
    Kennedy Diesel-owner
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  6. #6
    Join Date
    Jun 2005
    Location
    St. Augustine, FL
    Posts
    180

    Default

    I'm having the same problem. The word on the street is GM will fix it under warranty if it was manufactured before 12/04 and has less than 70,000 miles. I took my '05 to the dealer and they quietly acknowledged the extended warranty on the instrument cluster.
    2005 Chevy 2500HD, CC, SB, 4X4, Duramax, ARE Topper, 60 gallon RDS toolbox/tank combo, Kennedy Headlight Booster, Isspro pyrometer and boost gauges, EGR Blocker, PCV Kit, Bilsteins, 265 Michelin MS-2, TTS Exhaust, pulling 35' Jayco travel trailer.

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