2007 Pontiac G6
2007 Pontiac G6
Overview
The 2007 Pontiac G6, a mid-size sedan and coupe, offered a range of powertrain options and a generally comfortable ride. While it aimed to provide a sporty yet practical experience, like many vehicles of its era, it encountered some common issues that affected its long-term reliability. Owners reported a mix of concerns, particularly with certain engine and transmission configurations, as well as some electrical gremlins. Addressing these potential problems proactively can help maintain the G6’s performance and longevity. This analysis focuses on documented mechanical and electrical failures, excluding routine maintenance and expected wear.
Engine
3.5L V6 (LZ4)
Intake Manifold Gasket Leaks
- Symptoms: Coolant leaks, overheating, rough idle, loss of power.
- Solution: Replacement of the intake manifold gasket.
- Cost: $300 - $600
Oil Leaks
- Symptoms: Visible oil drips, burning oil smell, low oil level.
- Solution: Replacement of leaking seals or gaskets (e.g., valve cover gasket, oil pan gasket).
- Cost: $200 - $500
3.9L V6 (LZ9)
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: N/A
2.4L 4-Cylinder (LE5)
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: N/A
Transmission
4-Speed Automatic (4T65-E)
Harsh Shifting / Slipping
- Symptoms: Jerky gear changes, delayed engagement, slipping between gears.
- Solution: Transmission fluid and filter change, solenoid replacement, or full transmission rebuild.
- Cost: $400 - $2500
Torque Converter Issues
- Symptoms: Shuddering at low speeds, slipping, noise.
- Solution: Replacement of the torque converter.
- Cost: $600 - $1200
6-Speed Automatic (6T70/6T75)
No widespread issues reported.
- Symptoms: No widespread issues reported.
- Solution: No widespread issues reported.
- Cost: N/A
Suspension
Standard Chassis
Worn Struts/Shocks
- Symptoms: Bouncy ride, excessive body roll, uneven tire wear.
- Solution: Replacement of struts and/or shocks.
- Cost: $400 - $800
Ball Joint and Control Arm Wear
- Symptoms: Clunking noises over bumps, steering wander, uneven tire wear.
- Solution: Replacement of worn ball joints and control arms.
- Cost: $500 - $900
Electrical
General Electrical System
Window Regulator Failure
- Symptoms: Power windows not working, window stuck in position, grinding noise.
- Solution: Replacement of the window regulator and motor assembly.
- Cost: $200 - $400
Faulty Ignition Coils
- Symptoms: Misfires, rough idle, check engine light, poor acceleration.
- Solution: Replacement of faulty ignition coils.
- Cost: $150 - $300 per coil
BCM (Body Control Module) Issues
- Symptoms: Intermittent electrical problems, dashboard warning lights, issues with accessories.
- Solution: Diagnosis and potential reprogramming or replacement of the BCM.
- Cost: $500 - $1000
Exterior
Body Panels and Trim
Rusting
- Symptoms: Corrosion on fenders, rocker panels, and wheel wells, especially in rust-prone climates.
- Solution: Rust repair and repainting, or replacement of affected panels.
- Cost: $300 - $1500+
Headlight Haze/Yellowing
- Symptoms: Reduced visibility at night, yellowed or cloudy headlight lenses.
- Solution: Headlight restoration kit or replacement of headlight assemblies.
- Cost: $50 - $300
Interior
Interior Components
HVAC Blower Motor Failure
- Symptoms: No air coming from vents, or air only on high settings.
- Solution: Replacement of the HVAC blower motor and resistor.
- Cost: $200 - $400
Seat Fabric Wear
- Symptoms: Tearing or excessive wear on seat upholstery, particularly on driver’s side.
- Solution: Seat cover installation or professional upholstery repair/replacement.
- Cost: $100 - $500
Summary Verdict
The 2007 Pontiac G6 presents a mixed reliability profile. While some powertrain options, like the 3.9L V6 and the 6-speed automatic transmission, appear to be relatively robust, the 3.5L V6 and the 4-speed automatic transmission have documented issues such as intake manifold leaks, oil leaks, and transmission problems like harsh shifting and torque converter failures. Suspension components like struts and ball joints are also common wear items. Electrical gremlins, including window regulators and BCM issues, can be a source of frustration. Exterior rust and interior wear are also points to consider. Overall, potential buyers should be aware of these common issues and factor in potential repair costs, especially for vehicles with higher mileage or less consistent maintenance history.