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 2002 GMC Sierra 2500, both ongoing and closed, are listed below:

  1. INVESTIGATION: HYDRAULIC PUMP SHAFT FAILURES

    NHTSA Preliminary Evaluation #PE04004

    • Status:
      CLOSED
    • Date Opened: January 08, 2004
    • Date Closed: April 30, 2004
    • Recall: No recall issued

    Component(s): Service Brakes, Hydraulic
    Service Brakes, Hydraulic:Power Assist
    Service Brakes, Hydraulic:Power Assist:Hydraulic
    Steering:Hydraulic Power Assist System
    Steering:Hydraulic Power Assist:Pump

    Summary: The preliminary evaulation is being upgraded.during the ea ODI will limitits investigation to only those vehicles equipped with a hydro-boost system, which provides power assist to the braking and steering sytems.vaccuum brake booster vehicles are excluded.ODI hasexpanded the scope of the ea to include model years2003 and 2004, asduring the PE, ODI learned that the hydroboast pumps were modified in febraury 2004.therefore, ODI has expanded the scope to include the additional model years.ODI's is concerned because thisisa sudden failure that affects two critical systems of the vehicle, brakes and steering, at the same time.the ability of the operator to handle the dual failures is a concern. Further, these vehicles tend to be work vehicles, with some over 10,000 pounds gvwr and many equipped to pull large trailers.dual failures of heavily loaded vehicles and vehicles pulling trailers further increases the safety risk.ODI plans to conduct testing to quantify the braking and steering performance degradation and the impact on safe vehicle control, when a hydroboast pump fails.

  2. INVESTIGATION: TRAILER HITCH RECEIVER FAILURE

    NHTSA Engineering Analysis #EA07013

    • Status:
      CLOSED
    • Date Opened: September 14, 2007
    • Date Closed: September 12, 2008
    • Recall: No recall issued

    Component(s): Trailer Hitches

    Summary: Complaint reports allege poor weld quality and/or bending of the subject vehicle original equipment trailer hitch receiver.the Agency's investigation included analysis of manufacturer and Agency incident reports, review of police reports, analysis of the Agency's fatal analysis reporting system, a vehicle owner survey, inspection of tow vehicles/hitches and analysis of failed parts.incidents of weld failure were rare and associated with very low-speed driving (turning, backing and sudden stopping).incidents of bending were associated with improper trailer hitch adjustment or overloading. A safety-related defect has not been identified at this time and further use of Agency resources does not appear to be warranted.accordingly, this investigation is closed.the closing of this investigation does not constitute a finding by NHTSA that a safety-related defect does not exist.the Agency will monitor this issue and reserves the right to take further action if warranted by the circumstances.see document search file for addition information.

  3. INVESTIGATION: TRAILER HITCH RECEIVER FAILURE

    NHTSA Preliminary Evaluation #PE07025

    • Status:
      CLOSED
    • Date Opened: May 14, 2007
    • Date Closed: September 14, 2007
    • Recall: No recall issued

    Component(s): Trailer Hitches

    Summary: GM provided additional data regarding allegations of failure of the trailer hitch.ODI reviewed that as well as other data provided by peer manufacturers.based on our review, ODI finds the need to further investigate this issue.this preliminary evaluation is upgraded to an engineering analysis (EA07-013) for further assessment and study of this issue.