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2008 Pontiac Solstice investigations

2008 Pontiac Solstice

2 Defect Investigations from the NHTSA

NHTSA Defect Investigations for the 2008 Pontiac Solstice

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 2008 Pontiac Solstice, both ongoing and closed, are listed below:

  1. INVESTIGATION: Passenger Sensing System Sensor Mat

    NHTSA Defect Investigation #DP16001

    Component(s): Air Bags: Occupant Classification System - Ocs (Front Passenger)

    Summary: The Office of Defects Investigation (ODI) has received a petition from Mr. Troy Lyman requesting a defect investigation into an alleged defect of the air bag system on 2006-2010 Pontiac Solstice and 2007-2010 Saturn Sky vehicles.The petition letter is attached for review.The petitioner alleges that the Passenger Sensing System (PSS) sensor mat over time will kink, fold and eventually break.The petitioner further alleges that the break in the mat will cause a failure in the circuitry of the sensor mat that may lead to the passenger air bag system being inoperative (suppressed) when the seat is occupied by a passenger that would otherwise require air bag protection.In Attachment B, the petitioner identified 933 complaints received by NHTSA alleging air bag system issues.The identified complaints encompass several General Motors vehicle models in addition to the Pontiac Solstice and Saturn Sky.ODI will evaluate these complaints further to determine if the complaints pertain to the issue cited in the petition.This defect petition has been opened to evaluate the issue and determine whether to grant or deny the petition.

  2. INVESTIGATION: INADEQUATE BRAKE POWER ASSIST

    NHTSA Preliminary Evaluation #PE08016

    • Status:
      CLOSED
    • Date Opened: March 06, 2008
    • Date Closed: June 24, 2008
    • Recall: No recall issued

    Component(s): Service Brakes, Hydraulic
    Service Brakes, Hydraulic:Antilock
    Service Brakes, Hydraulic:Antilock:Control Unit/Module
    Service Brakes, Hydraulic:Power Assist
    Service Brakes, Hydraulic:Power Assist:Hydraulic
    Service Brakes, Hydraulic:Power Assist:Vacuum

    Summary: In model year (MY) 2007, Pontiac Solstice and Saturn sky vehicles equipped with the 2.0L turbocharged engine used an auxiliary vacuum pump to supplement the engine as a source of vacuum to the brake booster during low vacuum conditions, such as immediately after a cold start.the vacuum pump operation was controlled by switches that sensed booster vacuum, turning the pump on when booster vacuum dropped below a specified level.in the MY 2008 Solstice and sky vehicles (the subject vehicles), General Motors (GM) eliminated the auxiliary vacuum pump and replaced it with the optimized hydraulic braking (ohb) system.the design intent of ohb is to supplement engine vacuum, in conditions where low vacuum is generated by the engine, with hydraulic pressure generated by the stability control system pump controlled by the electronic brake control module (ebcm). For up to about aminute after a cold start, when the system is in ohb assist mode, the driver must press harder on the brake pedal to achieve desired deceleration.also, when the ohb mode is activated, the driver can hear and feel, through brake pedal vibration, the stability control system pump operation.starting in late April 2008, GM changed from the ohb system back to the vacuum pump system design.ODI is aware of 264 non-duplicative complaints to ODI and GM alleging inadequate brake power assist in the subject vehicles when applying the brakes just after a cold start, including one incident involving a crash into a tree during a driveway maneuver.to address these concerns by consumers, GM has issued threetechnical service bulletins.on June 4, 2007, GM released an informational bulletin (no part replacement or software updates), bulletin# 07-05-22-002, to dealers explaining the functionality of the ohb system.on November 29, 2007, GM released a service bulletin, bulletin# 07-05-22-007, with instructions to recalibrate the ebcm with revised software to make ohb operation feel more like a normal vacuum assist system.to improve cold start braking performance comparable to MY 2007 vehicles, GM released a third service bulletin in two parts, bulletins 07-05-25-007A (April 29, 2008) and 07-05-25-007B (May 16, 2008), for automatic and manual transmission vehicles respectively.these bulletins released new engine control software to change the idle strategy after a cold start so that more vacuum is available for brake power assist.beginning the week of June 23, 2008, GM will begin sending letters to consumers to make them aware of the availability of most recent calibration.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 take further action if warranted by the circumstances.

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