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  1. #1
    Jr. Apprentice
    Join Date
    Mar 2010
    brookeville maryland

    Default 2008 gmc sierra 4.8l wont crank

    go to turn the key and nothing happens everything seems to have power does anyone know what could cause this

  2. #2

    mfleetwood's Avatar
    Join Date
    Jul 2010
    Denver, CO
    Blog Entries


    It could be a number of things. I recently had a battery problem with my 2008, especially after I would let my truck sit for a few days. I think that if the battery power drops low enough, it could still run the accessories but not have enough power to kick over the starter. Do you have a way to test the battery? I know my charger tells me how much % of power is left in the battery. When mine was acting up, it was reading about 20% or less and wouldn't hold a full charge for very long. I ended up replacing my battery which solved the problem.

    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
    BFG All Terrain KO 315/70/17
    DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
    PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
    ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
    ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals

  3. #3


    Seen a lot of issues with underhood electrical centers having water in them.

  4. #4


    Could be battery already mentioned, but you have an 08. I'd expect the OEM to last just a touch longer... I just replaced the OEM in my 04 Silv. It only had 9 volts.

    If the battery tests OK, then check the cables leading to the solenoid and starter. Also check the ground cable from the battery down to the frame.

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