The Office of Defects Investigations (ODI) is an office within the NHTSA which investigates serious safety problems in the design, construction or performance of vehicles. The NHTSA is authorized to order manufacturers to recall and repair vehicles, if the ODI finds a safety issue. NHTSA investigations for the 2001 GMC Sierra 1500, both ongoing and closed, are listed below:


    NHTSA Preliminary Evaluation #PE03057

    • Status:
    • Date Opened: December 08, 2003
    • Date Closed: April 09, 2004
    • Recall: No recall issued

    Component(s): Parking Brake

    Summary: ODI opened PE03-057 to assess parking brake ineffectiveness in the subject vehicles.these vehicles are equipped with four wheel disc brakes that incorporate a single-shoe drum-in-hat parking brake independent of the service brakes.complaint and warranty data indicate that the parking brake linings tend to wear out early in the life of the vehicle (at an average of 24 months in service), reducing the parking brake system's torque below that needed to immobilize the vehicle.GM has attributed this accelerated wear to foreign material intrusion and a failure of the brake shoe to properly self-center within its brake drum.effective with the start of MY 2003 production, a newer reduced force hold-down clip was introduced to facilitate brake shoe disengagement from the drum surface.this part is also available at the service level for the MY 1999-2002 vehicles.GM has indicated that the paking brake is intended to operate in conjunction with the transmission to immobilze parked vehicles, and that in many cases, accelerated parking brake lining wear is caused by rough use, vehicle modifications, and driving with the parking engaged. ODI has upgraded the preliminary evaluation to an engineering analysis to gather further information concerning parking brake usage factors and the circumstances surrounding the seventeen reported vehicle crashes.


    NHTSA Engineering Analysis #EA04011

    Component(s): Parking Brake
    Parking Brake:Conventional
    Parking Brake:Conventional:Mechanical
    Parking Brake:Conventional:Mechanical:Linkage And Cable

    Summary: In a letter dated April 20, 2005, GM notified NHTSA that it had decided that defects that relate to motor vehicle safety exist in certain model year (MY) 1999-2002 C/K 1500 series (PBR parking brake system) and MY 2001-2005 C/K 2500 and 3500 series (TRW parking brake system) pickups with manual transmissions.according to GM, some of these vehicles may have conditions that cause the friction linings to wear to an extent where the parking brake can become ineffective in immobilizing a parked vehicle.GM's action covers an estimated total of 142,585 vehicles.dealers will install a low-force spring clip retainer for vehicles equipped with the PBR parking brake system and install a redesigned parking brake cable assembly on vehicles equipped with the TRW parking brake system. A total of 58 non-duplicative complaints were received by ODI and GM concerning the approximately 59,000 MY 1999-2002 C/K 1500 series pickup trucks with the PBR parking brake system.these included 22 alleged rollaway incidents, resulting in a rate of 38.5 rollaway incidents per 100,000 vehicles.ODI is aware of 24 complaints regarding the MY 2001-2005 C/K 2500 and 3500 series manual transmission trucks recalled by GM, including 5 alleging rollaway incidents.though the conditions described in GM's letter are also present in the C/K trucks with automatic transmissions, the rollaway rate in those vehicles was similar to those observed in peer vehicles studied by ODI in this investigation.this engineering analysis is closed. For additional information, see the attached closing report.