2006 GMC Envoy

The 2006 GMC Envoy is a mid-size SUV that offers a blend of comfort and utility. The most common engine option is the 4.2L Inline-6, producing approximately 291 horsepower and 277 lb-ft of torque. A 5.3L V8 engine, which produces approximately 302 horsepower and 330 lb-ft of torque, was also available as an upgrade. Both engines were paired with the 4L60-E 4-speed automatic transmission. People generally liked the Envoy’s spacious interior and smooth ride, but common complaints include relatively poor fuel economy, some reliability issues, and an outdated interior design for its time.

Engine

4.2L Inline-6

• Camshaft Actuator Failure
  • Description/Symptoms: The camshaft actuator can fail, leading to a check engine light, rough idling, and reduced engine performance. Often accompanied by error codes P0014 or P0017.
  • Solution: Replacing the camshaft actuator solenoid.
  • Estimated Cost to Fix: $150 - $300
  • Recalls: None Found
• Ignition Coil Failure
  • Description/Symptoms: Rough running engine, misfires, check engine light. Commonly cylinder specific codes such as P0300-P0306
  • Solution: Replacing the faulty ignition coil(s).
  • Estimated Cost to Fix: $80 - $200+ (depending on how many need replacing)
  • Recalls: None Found
• Coolant Loss / Cylinder Head Cracking
  • Description/Symptoms: External coolant leak near spark plug ports, overheating, white smoke from exhaust, coolant smell.
  • Solution: Replacing the cylinder head.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

5.3L V8

• Oil Consumption
  • Description/Symptoms: Excessive oil consumption with no apparent leaks, blue smoke from the exhaust.
  • Solution: In some cases, replacing the valve stem seals or piston rings. In more severe cases, a complete engine rebuild or replacement may be necessary.
  • Estimated Cost to Fix: $500 - $4000+ (depending on the severity and chosen repair method)
  • Recalls: None Found
• Lifter Failure (Specifically AFM Lifters)
  • Description/Symptoms: Ticking noise from the engine, misfires, rough running, potential for camshaft damage, check engine light.
  • Solution: Replacing the failed lifter(s). AFM delete kits are also available.
  • Estimated Cost to Fix: $800 - $2500+
  • Recalls: None Found

Transmission

4L60-E 4-Speed Automatic

• Transmission Slipping/Hard Shifting
  • Description/Symptoms: Transmission slipping between gears, delayed or harsh shifts, especially between 2nd and 3rd gear.
  • Solution: Replacing worn clutches, valve body repair/replacement, or a complete transmission rebuild.
  • Estimated Cost to Fix: $500 - $3000+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering at low speeds, especially when accelerating, stalling, or complete transmission failure.
  • Solution: Replacing the torque converter.
  • Estimated Cost to Fix: $500 - $1500+
  • Recalls: None Found

Suspension

• Air Suspension Compressor Failure (If Equipped)
  • Description/Symptoms: Sagging rear suspension, compressor running constantly or not at all, “Service Ride Control” message on the dashboard.
  • Solution: Replacing the air suspension compressor.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found
• Air Suspension Bladder Leaks (If Equipped)
  • Description/Symptoms: Sagging rear suspension, compressor running constantly or not at all.
  • Solution: Replacing the air bladder.
  • Estimated Cost to Fix: $200 - $600+ per side
  • Recalls: None Found
• Front Wheel Bearing Failure
  • Description/Symptoms: Humming or grinding noise from the front wheels, especially when turning.
  • Solution: Replacing the affected wheel bearing(s).
  • Estimated Cost to Fix: $200 - $400+ per side
  • Recalls: None Found

Electrical

• Instrument Panel Cluster Issues
  • Description/Symptoms: Gauges not working properly (speedometer, fuel gauge, etc.), flickering or dimming display.
  • Solution: Repairing or replacing the instrument panel cluster.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Body Control Module (BCM) Failure
  • Description/Symptoms: Intermittent electrical issues such as power windows not working, door locks malfunctioning, or interior lights failing.
  • Solution: Replacing or reprogramming the BCM.
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door locks not working correctly, either not locking/unlocking or making unusual noises.
  • Solution: Replacing the faulty door lock actuator.
  • Estimated Cost to Fix: $150 - $300+ per door
  • Recalls: None Found

Exterior

• Rear Wiper Motor Failure
  • Description/Symptoms: Rear wiper not working, or working intermittently.
  • Solution: Replacing the rear wiper motor.
  • Estimated Cost to Fix: $100 - $250+
  • Recalls: None Found
• Liftgate Strut Failure
  • Description/Symptoms: Rear liftgate will not stay open on its own.
  • Solution: Replacing the liftgate struts.
  • Estimated Cost to Fix: $50 - $150+
  • Recalls: None Found

Interior

• HVAC Actuator Failure (Blend Door)
  • Description/Symptoms: Inconsistent temperature control, clicking noises behind the dashboard, air only blowing hot or cold.
  • Solution: Replacing the faulty HVAC actuator(s).
  • Estimated Cost to Fix: $150 - $400+ (depending on location)
  • Recalls: None Found

Summary

The 2006 GMC Envoy can be a decent vehicle, but potential buyers should be aware of its common issues. Engine problems like camshaft actuator failure in the I6 and oil consumption/lifter failure in the V8 can be costly, as can transmission issues with the 4L60-E. Electrical issues are also fairly common. While some repairs are relatively inexpensive, others, such as engine or transmission rebuilds, can be very expensive. Pre-purchase inspections by a qualified mechanic are highly recommended.