2005 Pontiac Bonneville

Introduction

The 2005 Pontiac Bonneville is a full-size sedan that was available with a choice of two engine and transmission combinations:

• 3.8L V6 with 4-speed automatic transmission (205 hp / 230 lb-ft torque)
• 3.8L Supercharged V6 with 4-speed automatic transmission (240 hp / 280 lb-ft torque)

The Bonneville was praised for its spacious and well-appointed interior, smooth ride, and responsive handling. However, it received criticism for its lackluster performance and fuel economy.

Engine

3.8L V6

• Intake Manifold Gasket Failure
  • Description/Symptoms: Coolant leaks, overheating, rough idle
  • Solution: Replace intake manifold gaskets
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found
• Oil Leak from Valve Cover Gaskets
  • Description/Symptoms: Oil leaks around valve covers, burning oil smell
  • Solution: Replace valve cover gaskets
  • Estimated Cost to Fix: $200 - $300
  • Recalls: None Found

3.8L Supercharged V6

• Intercooler Pump Failure
  • Description/Symptoms: Loss of boost, reduced power
  • Solution: Replace intercooler pump
  • Estimated Cost to Fix: $600 - $800
  • Recalls: None Found
• Intake Manifold Runner Control Motor Failure
  • Description/Symptoms: Reduced power, poor fuel economy
  • Solution: Replace intake manifold runner control motor
  • Estimated Cost to Fix: $300 - $400
  • Recalls: None Found

Transmission

4-Speed Automatic Transmission

• Transmission Slipping
  • Description/Symptoms: Difficulty shifting gears, loss of power
  • Solution: Rebuild or replace transmission
  • Estimated Cost to Fix: $1,500 - $2,500
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Transmission shudder, overheating
  • Solution: Replace torque converter
  • Estimated Cost to Fix: $700 - $1,000
  • Recalls: None Found

Suspension

• Front Suspension Strut Mount Failure
  • Description/Symptoms: Clunking or rattling noises, poor handling
  • Solution: Replace strut mounts
  • Estimated Cost to Fix: $200 - $300
  • Recalls: None Found
• Rear Suspension Sway Bar Links Failure
  • Description/Symptoms: Clunking or rattling noises
  • Solution: Replace sway bar links
  • Estimated Cost to Fix: $100 - $200
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Battery goes dead after sitting for a period of time
  • Solution: Replace battery or find and fix source of drain
  • Estimated Cost to Fix: $100 - $200
  • Recalls: None Found
• Alternator Failure
  • Description/Symptoms: Dimming lights, battery warning light on
  • Solution: Replace alternator
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found

Exterior

• Headlight Switch Failure
  • Description/Symptoms: Headlights not turning on or flickering
  • Solution: Replace headlight switch
  • Estimated Cost to Fix: $100 - $200
  • Recalls: None Found

Interior

• Window Regulator Failure
  • Description/Symptoms: Window not rolling up or down
  • Solution: Replace window regulator
  • Estimated Cost to Fix: $300 - $500
  • Recalls: None Found
• Heater Core Failure
  • Description/Symptoms: No heat from vents
  • Solution: Replace heater core
  • Estimated Cost to Fix: $500 - $700
  • Recalls: None Found

Summary

The 2005 Pontiac Bonneville has several common issues that can be costly to repair, including transmission problems, suspension issues, and electrical failures. However, it is generally considered a reliable vehicle with a comfortable and spacious interior. The severity and cost of the issues vary depending on the specific problem encountered.