2007 Pontiac Grand Prix

2007 Pontiac Grand Prix

Overview

The 2007 Pontiac Grand Prix, a mid-size sedan, offered a range of powertrain options and a comfortable ride. While generally considered a decent vehicle for its time, like any car, it has specific areas that have seen more reported issues than others. This analysis focuses on common mechanical and electrical problems reported by owners, excluding routine maintenance. Understanding these potential pitfalls can help prospective buyers and current owners make informed decisions regarding maintenance and repairs.

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Engine

3.8L V6 (Naturally Aspirated)

Intake Manifold Gasket Leaks

• Symptoms: Coolant leaks, engine overheating, sweet smell from engine bay.
• Solution: Replacement of the intake manifold gaskets.
• Cost: $400 - $700

EGR Valve Clogging

• Symptoms: Rough idle, stalling, check engine light.
• Solution: Cleaning or replacement of the EGR valve.
• Cost: $150 - $300

3.8L V6 Supercharged (3800 Series III)

Supercharger Belt Slippage

• Symptoms: Loss of power, whining noise from the engine bay.
• Solution: Replacement of the supercharger belt and tensioner.
• Cost: $150 - $300

Intake Manifold Gasket Leaks

• Symptoms: Coolant leaks, engine overheating, sweet smell from engine bay.
• Solution: Replacement of the intake manifold gaskets.
• Cost: $400 - $700

Transmission

4T65E (4-Speed Automatic)

Torque Converter Issues

• Symptoms: Shuddering, slipping, delayed engagement, transmission fluid leaks.
• Solution: Rebuild or replacement of the torque converter and potentially the transmission.
• Cost: $1200 - $2500

Solenoid Failure

• Symptoms: Harsh shifting, failure to shift into certain gears, check engine light.
• Solution: Replacement of faulty shift solenoids.
• Cost: $300 - $600

Suspension

Standard Chassis

Strut Mount Bearing Failure

• Symptoms: Clunking or popping noises when turning the steering wheel, especially at low speeds.
• Solution: Replacement of the strut mount bearings.
• Cost: $200 - $400

Worn Ball Joints/Tie Rod Ends

• Symptoms: Clunking noises over bumps, vague steering, uneven tire wear.
• Solution: Replacement of worn ball joints and/or tie rod ends.
• Cost: $300 - $600

Electrical

Body Control Module (BCM)

BCM Malfunctions

• Symptoms: Intermittent issues with power windows, locks, interior lights, or dashboard warning lights.
• Solution: Reprogramming or replacement of the BCM.
• Cost: $500 - $1000

Alternator

Premature Alternator Failure

• Symptoms: Dimming headlights, battery warning light, difficulty starting, dead battery.
• Solution: Replacement of the alternator.
• Cost: $400 - $700

Exterior

Standard Body

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

Interior

Standard Interior

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

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Summary Verdict

The 2007 Pontiac Grand Prix, particularly with the popular 3.8L V6 engines, can be a reliable choice if well-maintained. However, owners should be aware of potential issues with the 4T65E transmission, specifically torque converter problems and solenoid failures. Engine-wise, intake manifold gasket leaks are a common concern across both naturally aspirated and supercharged variants. Electrical gremlins, often related to the BCM or premature alternator failure, can also arise. Suspension components like strut mounts and ball joints may require attention over time. While the exterior and interior generally hold up well, addressing these mechanical and electrical points proactively can contribute to a more dependable ownership experience.