2006 Hummer H2

The 2006 Hummer H2 is a large, imposing SUV known for its off-road capabilities and distinctive styling. It came standard with a 6.0L V8 engine producing around 325 horsepower and 365 lb-ft of torque, paired with a 4L65-E four-speed automatic transmission. Many owners appreciate the H2’s ruggedness and unique appearance. Common complaints often revolve around its poor fuel economy and large size, making it difficult to maneuver in tight spaces. This report details common issues and complaints specific to the 2006 Hummer H2.

Engine

6.0L V8

• Oil Consumption
  • Description/Symptoms: Excessive oil consumption may occur, requiring frequent top-offs between oil changes. Blue smoke from the exhaust can also be a symptom.
  • Solution: Diagnosis can involve checking for leaks, performing a compression test, and examining valve seals. Depending on the cause, the repair may involve replacing valve seals, piston rings, or the entire engine.
  • Estimated Cost to Fix: $500 - $5,000+
  • Recalls: None Found
• Exhaust Manifold Bolts Breaking
  • Description/Symptoms: Ticking noise, especially upon cold start, exhaust smell in the cabin.
  • Solution: Replacing the broken manifold bolts, which sometimes requires removing the cylinder head if the bolts are seized.
  • Estimated Cost to Fix: $300 - $1,000+
  • Recalls: None Found
• Knock Sensor Failure
  • Description/Symptoms: The engine may experience reduced power, poor fuel economy, and the check engine light might illuminate with codes related to the knock sensors. The sensor detects abnormal engine vibrations.
  • Solution: Replacement of the faulty knock sensor(s). It is often recommended to replace both sensors at the same time.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Transmission

4L65-E Four-Speed Automatic

• Delayed or Harsh Shifting
  • Description/Symptoms: Transmission may hesitate before shifting gears or shift with a hard jolt. This can be more noticeable when the transmission is cold.
  • Solution: Could involve a transmission fluid flush, replacement of solenoids, or a complete transmission rebuild depending on the severity.
  • Estimated Cost to Fix: $150 (fluid flush) - $3,000+ (rebuild)
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering during acceleration, especially at lower speeds. Can also cause stalling or poor fuel economy.
  • Solution: Replacement of the torque converter.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found

Suspension

• Air Suspension Compressor Failure (If Equipped)
  • Description/Symptoms: Rear of the vehicle sagging, inability to maintain ride height, air suspension warning light illuminated.
  • Solution: Replacement of the air compressor unit.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Front Wheel Bearing Failure
  • Description/Symptoms: Grinding or humming noise coming from the front wheels, especially noticeable when turning. Excessive play in the wheel.
  • Solution: Replacement of the affected wheel bearing(s).
  • Estimated Cost to Fix: $300 - $600+ per wheel
  • Recalls: None Found

Electrical

• Instrument Panel Cluster Issues
  • Description/Symptoms: Gauges malfunctioning (e.g., speedometer, fuel gauge), intermittent power loss to the cluster, display flickering.
  • Solution: Repair or replacement of the instrument panel cluster.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• Door Lock Actuator Failure
  • Description/Symptoms: Door locks failing to lock or unlock properly, intermittent operation.
  • Solution: Replacement of the faulty door lock actuator.
  • Estimated Cost to Fix: $150 - $300+ per door
  • Recalls: None Found

Exterior

• Rust on Undercarriage
  • Description/Symptoms: Rust developing on the frame, suspension components, and other undercarriage parts, especially in areas with road salt exposure.
  • Solution: Rust removal, treatment, and application of protective coatings. In severe cases, component replacement may be necessary.
  • Estimated Cost to Fix: $200 - $2,000+ depending on severity
  • Recalls: None Found
• Headlight Condensation
  • Description/Symptoms: Moisture buildup inside the headlight lenses.
  • Solution: Resealing or replacement of the headlight assembly.
  • Estimated Cost to Fix: $100 - $500+ per headlight
  • Recalls: None Found

Interior

• HVAC Blower Motor Resistor Failure
  • Description/Symptoms: Loss of some or all blower motor speeds, only high speed working.
  • Solution: Replacement of the blower motor resistor.
  • Estimated Cost to Fix: $100 - $250+
  • Recalls: None Found
• Sunroof Issues
  • Description/Symptoms: Sunroof getting stuck, making unusual noises, or failing to open or close completely.
  • Solution: Could require lubrication of the tracks, replacement of the motor, or more extensive repairs.
  • Estimated Cost to Fix: $100 - $800+
  • Recalls: None Found

Summary

The 2006 Hummer H2, while iconic and capable, can be prone to several common issues. Engine problems such as oil consumption and exhaust manifold bolt breakage can lead to moderate to significant repair costs. Transmission issues like delayed shifting or torque converter failure also require attention and can be costly to fix. Suspension and electrical problems also plague the vehicle. Prospective buyers should be aware of these potential problems and carefully inspect the vehicle’s maintenance history before purchasing. While some issues are relatively minor, others can lead to significant repair bills, so a pre-purchase inspection by a qualified mechanic is recommended.