2008 Pontiac G8

The 2008 Pontiac G8 was a rear-wheel-drive sedan known for its performance and Australian-engineered chassis. It was available with three engine options: a 3.6L V6 producing 256 hp and 248 lb-ft of torque, a 5.3L V8 producing 302 hp and 320 lb-ft of torque, and a 6.0L V8 producing 361 hp and 385 lb-ft of torque. The V6 was paired with a 5-speed automatic transmission, while the V8s came with a 6-speed automatic. Owners generally appreciated the G8’s blend of power, handling, and value. Common complaints centered around some reliability issues and the car’s relatively short production run, which made parts availability a potential concern over time.

Engine

3.6L V6

• Timing Chain Wear
  • Description/Symptoms: Engine may experience a rattling noise, especially on startup. The check engine light may illuminate with codes related to timing chain issues. Can lead to poor performance and potential engine damage.
  • Solution: Replace the timing chain, tensioners, and guides.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found

5.3L V8

• Active Fuel Management (AFM) Lifter Failure
  • Description/Symptoms: Ticking or knocking noise from the engine, misfires, and a check engine light. Often occurs in cylinders 1, 4, 6, or 7 due to the AFM system.
  • Solution: Replace the faulty lifters, and consider a complete AFM delete kit to prevent future issues.
  • Estimated Cost to Fix: $2000 - $4000+
  • Recalls: None Found

6.0L V8

• Oil Consumption
  • Description/Symptoms: Noticeable decrease in oil level between oil changes, blue smoke from the exhaust, and potential spark plug fouling.
  • Solution: In some cases, piston rings are the cause. Replacement may be necessary. Other possible causes include valve stem seals.
  • Estimated Cost to Fix: $1500 - $5000+
  • Recalls: None Found

Transmission

5-Speed Automatic (3.6L V6)

• Harsh Shifting
  • Description/Symptoms: Rough or jerky shifts, especially between 1st and 2nd gear.
  • Solution: Fluid flush and filter change. In some cases, a valve body rebuild or replacement is necessary.
  • Estimated Cost to Fix: $150 - $2000+
  • Recalls: None Found

6-Speed Automatic (5.3L & 6.0L V8)

• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibration, especially under light acceleration or when maintaining speed. Can also cause stalling.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found

Suspension

• Strut Mount Failure
  • Description/Symptoms: Squeaking or popping noises coming from the front suspension, especially when turning or going over bumps.
  • Solution: Replace the strut mounts.
  • Estimated Cost to Fix: $300 - $600
  • Recalls: None Found

Electrical

• Driver Information Center (DIC) Pixelation/Failure
  • Description/Symptoms: Pixels on the DIC display become unreadable or the entire display fails.
  • Solution: Replacement of the DIC.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door locks not working correctly, or not working at all.
  • Solution: Replace the door lock actuator.
  • Estimated Cost to Fix: $150 - $300
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof may not open or close correctly, or may leak when closed.
  • Solution: Cleaning and lubricating the sunroof tracks and seals. In some cases, the sunroof motor or entire assembly needs to be replaced.
  • Estimated Cost to Fix: $100 - $1000+
  • Recalls: None Found

Interior

• HVAC Actuator Failure
  • Description/Symptoms: Clicking or thumping noise coming from behind the dashboard. Inability to control the temperature or airflow direction.
  • Solution: Replace the faulty HVAC actuator.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Summary

The 2008 Pontiac G8 has some common issues, primarily related to the engine and electrical systems. The AFM lifter failure on the 5.3L and oil consumption on the 6.0L can be expensive to fix. Electrical issues like DIC failure and door lock actuators are also relatively common. The severity of these issues ranges from minor inconveniences to major mechanical repairs. Potential buyers should be aware of these common problems and factor in potential repair costs when considering purchasing a 2008 Pontiac G8.