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NHTSA Defect Investigations for the 2004 Chevrolet Aveo

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 2004 Chevrolet Aveo, both ongoing and closed, are listed below:

  1. STUCK THROTTLE VALVE NHTSA Engineering Analysis #EA08005

    • Status:
      CLOSED
    • Date Opened: February 14, 2008
    • Date Closed: October 14, 2008
    • Recall: no recall issued

    Component(s): Engine And Engine Cooling:Exhaust System:Emission Control:Crankcase (Pcv)
    Vehicle Speed Control

    Summary: To date, the Office Of Defects Investigation (ODI) is aware of 29 non-duplicative complaints/field reports and 52 warranty claims related to the alleged defect affecting 69 unique subject vehicles.because the alleged defect condition is most likely to occur during winter months when ambient temperatures are below freezing, ODI upgraded this investigation to an engineering analysis on February 14, 2008 so that it could continue to monitor the field experience during the 2007/2008 winter season.by letter dated May 22, 2008, General Motors Corp. (GM) supplemented its previous information request response with field data received by GM through May 1, 2008.according to GM, when moisture freezes in the positive crankcase ventilation (PCV) system and/or the engine air intake tract it is most often observed as a hard to start/no start condition, throttle stuck closed, rough running engine, stalling at idle, or oil leakage.of the 29 complaints related to stuck throttle, ODI identified 5 reports that allege unwanted acceleration, 13 reports describe an apparent high-idle condition at start up or when slowing the vehicle to a stop without any allegation of unwanted acceleration or diminished braking performance, and the remaining 11 reports describe ambiguous allegations of stuck throttle without regard to severity or consequence.ODI analysis of field incident data shows that the complaint and warranty trends appear to be in decline, with only 1 additional complaint and 6 warranty claims related to the alleged defect received by GM since April 2007. A safety-related defect trend has not been identified at this time and further use of Agency resources does not appear to be warranted.accordingly, this investigation has been closed.the closing of this investigation does not constitute a finding by NHTSA that a safety-related defect does not exist.the Agency will take further action if warranted by the circumstances.

    NHTSA: For detailed information & supporting documents, see the official NHTSA page concerning investigation #EA08005 »

  2. STUCK THROTTLE VALVE NHTSA Preliminary Evaluation #PE07051

    • Status:
      CLOSED
    • Date Opened: October 19, 2007
    • Date Closed: February 14, 2008
    • Recall: no recall issued

    Component(s): Engine And Engine Cooling:Exhaust System:Emission Control:Crankcase (Pcv)
    Vehicle Speed Control

    Summary: On October 19, 2007, the Office Of Defects Investigation (ODI) opened a preliminary evaluation to investigate alleged stuck throttle incidents due to ice formation within the engine air intake tract in certain model year (MY) 2004-2005 Chevrolet Aveo vehicles manufactured for sale or lease in the United States.this investigation was prompted by a safety recall campaign (05F-069) conducted by General Motors Corp. (GM) involving substantially similar vehicles manufactured for sale or lease in Canada.at that time, GM issued a technical service bulletin (tsb #05-06-04-065) to address the alleged defect condition in U.S. vehicles.GM subsequently revised the Canadian recall campaign to include more detailed instructions after it discovered certain vehicles were not properly serviced under the original recall campaign.GM revised the Canadian recall campaign a second time to include more substantial changes to the throttle body, intake manifold, positive crankcase ventilation (PCV) and engine cooling systems to further reduce the likelihood of icing within the engine air intake tract.again, GM issued a technical service bulletin (tsb #08-06-04-009) to address the alleged defect condition in U.S. vehicles using the revised procedure.ODI is aware of 28 non-duplicative complaints/field reports and 46 warranty claims related to the alleged defect affecting 63 unique subject vehicles.the alleged defect condition is most likely to occur during the winter months when ambient temperatures are below freezing.however, the information provided in GM's response to ODI's information request letter dated November 2, 2007, does not capture events that may have occurred during the most recent winter months.accordingly, this investigation has been upgraded to an engineering analysis (EA08-005) to further study the frequency of the alleged defect.

    NHTSA: For detailed information & supporting documents, see the official NHTSA page concerning investigation #PE07051 »

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