2008 Pontiac Grand Prix Sedan

Overall Performance and Design: Taken from the Automotive Performance, Execution and Layout (APEAL) study, this measure is based on owner satisfaction with vehicle Performance, Style, Features and Instrument Panel, and Comfort.

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Performance: This component of APEAL is based on owner satisfaction with the vehicle's powertrain and suspension systems, including acceleration, fuel economy, handling stability, braking performance, and shift quality.

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Comfort: This component of APEAL is based on owner satisfaction with the vehicle's comfort and convenience features and seats.

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Features and Instrument Panel: This component of APEAL is based on owner satisfaction with the vehicle's stereo system, gauges/instruments, and heating/air conditioning system.

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Style: This component of APEAL is based on owner satisfaction with the vehicle’s interior and exterior styling, uniqueness of styling, and exterior and interior colors.

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Overall IQS: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems that have caused a complete breakdown or malfunction, or where controls or features may work as designed, but are difficult to use or understand.

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Overall Quality Mechanical: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems that have caused a complete breakdown or malfunction of any component, feature, or item (i.e., components that stop working or trim pieces that break or come loose).

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Powertrain Quality Mechanical: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems with the engine or transmission as well as problems that affect the driving experience (i.e., vehicle/brakes pull, abnormal noises or vibrations) only.

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Body Interior Quality Mechanical: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems with wind noise, water leaks, poor interior fit/finish, paint imperfection, and squeaks/rattles.

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Features Accessories Quality Mechanical: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems with the seats, windshield wipers, navigation system, rear-seat entertainment system, heater, air conditioner, stereo system, sunroof and trip computer.

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Overall Quality Design: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems where controls or features may work as designed, but are difficult to use or understand (i.e., overly complicated controls/features that are difficult to operate due to poor location).

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Powertrain Quality Design: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems with the engine or transmission as well as problems that affect the driving experience (i.e., ride smoothness, responsiveness of the steering system and brakes, and handling/stability).

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Body Interior Quality Design: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems with the front-/rear-end styling, the appearance of the interior and exterior, and the sound of the doors when closing.

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Features Accessories Quality Design: Taken from the Initial Quality Study (IQS), which looks at owner-reported problems in the first 90 days of new-vehicle ownership, this score is based on problems with the seats, stereo/navigation system, heater, air conditioner, and sunroof.

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Predicted Reliability: The predicted reliability score is based on trending the past three years of historical initial quality and dependability data from J.D. Power's automotive studies, specifically the Vehicle Dependability Study (VDS) and the Initial Quality Study (IQS).

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