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  1. #1
    Jr. Apprentice
    Join Date
    Mar 2010
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    brookeville maryland
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    16

    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
    Legend


    mfleetwood's Avatar
    Join Date
    Jul 2010
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    Denver, CO
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    Default

    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;
    TIRES:
    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

    Default

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

  4. #4

    Default

    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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