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NHTSA Defect Investigations for the 2004 Chevrolet Trailblazer

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 Trailblazer, both ongoing and closed, are listed below:


    NHTSA Engineering Analysis #EA04021

    Component(s): Exterior Lighting:Brake Lights

    Summary: GM states that some brake/tail lamp bulbs can prematurely become inoperative due to malfunctioning brake/tail lamp sockets.on March 2, 2004, GM initiated a 6-year/72,000 mile "special policy" for 989,487 subject vehicles to inspect and replace the rear brake/tail lamp bulb socket assemblies.on April 4, 2004, the Office Of Defects Investigation (ODI) opened a preliminary evaluation (PE04-032) based on consumer complaints alleging brake lights not operating when the brake pedal is depressed.on August 3, 2004 ODI upgraded PE04-032 to an engineering analysis (EA04-021).by letter dated October 27, 2004 GM notified NHTSA that it will conduct a safety recall (NHTSA # 04V527) covering subject vehicles that were not already repaired under GM's "special policy."MY 2004 subject vehicles built after August 8, 2003 contain improved brake lamp assemblies and are not included in the recall.GM dealers will install the improved brake lamp assembly on subject vehicles built on August 8, 2003 and earlier.the action taken by GM is sufficient to resolve the issues raised by this investigation.accordingly, this investigation is closed.


    NHTSA Preliminary Evaluation #PE04032

    • Status:
    • Date Opened: April 06, 2004
    • Date Closed: August 03, 2004
    • Recall: No recall issued

    Component(s): Exterior Lighting:Brake Lights

    Summary: The Office Of Defects Investigation (ODI) opened this investigation on model year (MY) 2002-04 Chevrolet Trailblazer vehicles.GM reports that other vehicles sharing this platform and brake lamp design are the MY 2002-2004 Chevrolet Trailblazer ext; GMC Envoy, XL, xuv; Oldsmobile Bravada and 2004 Buick rainier.complaints allege that the rear brake lamp does not operate when the brake pedal is depressed.there is no indication to the driver from inside the vehicle that one or more brake lamps bulbs are not functioning.GM found that heat from the bulb could deform the lamp socket, produce electrical arcing and an inoperative correct the condition, GM changed the bulb to a bulb that transmits less heat to the socket and changed the socket to a thermoplastic polymer to improve thermal stability.these changes were implemented into production vehicles on October 1, 2003.GM implemented a "special policy" by notifying consumers that if they should experience a brake lamp failure to go to their GM dealership to have the circuit board containing the brake lamp replaced along with new bulbs.this policy is good for the first 6 years or 72,000 miles of the life of the vehicle.ODI will upgrade this investigation to ea 04-021 and include the above mentioned vehicles.


    NHTSA Engineering Analysis #EA07009

    • Status:
    • Date Opened: July 10, 2007
    • Date Closed: August 28, 2008
    • Recall: No recall issued

    Component(s): Fuel System, Gasoline:Delivery:Fuel Pump

    Summary: During the course of this ea investigation, ODI observed that the majority of the complaints (88%) and warranty claims (94%) were reported for vehicles that are registered for use in the "salt belt" region of the us.this area includes 20 states in the northeast, mid atlantic and the midwest regions and the District of Columbia.consumers in the salt belt region reported to ODI that they could smell fuel vapors in their vehicles while driving.upon further examination of their vehicles, they discovered that fuel vapors were coming out of the top of the fuel tank. This condition is caused by corrosion of the return and sender lines of the fuel pump module.water and road salt collect on top of the fuel pump leading to small pinholes appearing on the fuel lines.fuel may leak and collect on top of the module and/or spill onto the ground.the data evaluated under this investigation reflect a relatively low frequency of occurrence that largely arises in salt belt states.GM has extended the warranty on the subject component to ten years or 120,000 miles.further use of Agency resources does not appear to be warranted at this time; accordingly, this investigation is closed.the closing of this investigation does not constitute a finding by NHTSA that no safety-related defect exists.the Agency reserves the right to take further action if warranted by the circumstances.for additional information select document search.

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