2007 Hummer H3

The 2007 Hummer H3 is a mid-size SUV known for its off-road capabilities and distinctive Hummer styling. It came standard with a 3.7L Inline-5 engine producing 242 horsepower and 242 lb-ft of torque. Later in the model year, a 5.3L V8 engine became optional, producing 300 horsepower and 320 lb-ft of torque. Transmission options included a 5-speed manual and a 4-speed automatic. Owners often appreciate the H3’s rugged appearance and off-road prowess. Common dislikes include its relatively poor fuel economy and some reliability concerns.

Engine

3.7L Inline-5

• Cylinder Head Cracking
  • Description/Symptoms: Coolant loss, overheating, white smoke from the exhaust, and potential engine damage. Cracks typically develop between the valves.
  • Solution: Replacement of the cylinder head.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Camshaft Actuator Failure
  • Description/Symptoms: Rough idling, reduced engine performance, and a check engine light with codes related to camshaft position.
  • Solution: Replacement of the camshaft actuator.
  • Estimated Cost to Fix: $500 - $1,000
  • Recalls: None Found

5.3L V8

• Oil Consumption
  • Description/Symptoms: Excessive oil consumption, blue smoke from the exhaust, and potentially fouled spark plugs.
  • Solution: Replacement of valve stem seals and/or piston rings. In severe cases, engine replacement or rebuild.
  • Estimated Cost to Fix: $800 - $5,000+
  • Recalls: None Found

Transmission

4L60-E 4-Speed Automatic

• Harsh Shifting/Slipping
  • Description/Symptoms: Rough or delayed shifting, transmission slipping, and potentially a check engine light.
  • Solution: Transmission rebuild or replacement. Could be valve body related
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found

Suspension

• Front Wheel Bearing Failure
  • Description/Symptoms: Grinding or humming noise from the front wheels, especially noticeable during turns.
  • Solution: Replacement of the affected wheel bearing(s).
  • Estimated Cost to Fix: $300 - $600 per wheel
  • Recalls: None Found
• Ball Joint Failure
  • Description/Symptoms: Popping or clicking noise from the front suspension, loose or unstable steering, and uneven tire wear.
  • Solution: Replacement of the affected ball joints.
  • Estimated Cost to Fix: $200 - $500 per ball joint
  • Recalls: None Found
• Torsion Bar Adjustment
  • Description/Symptoms: Sagging front end, poor ride quality, and difficulty maintaining proper alignment.
  • Solution: Adjusting the torsion bars or replacing them if damaged.
  • Estimated Cost to Fix: $100-$400
  • Recalls: None Found

Electrical

• Body Control Module (BCM) Issues
  • Description/Symptoms: Intermittent electrical issues such as malfunctioning power windows, door locks, lights, or wipers.
  • Solution: BCM reprogramming or replacement.
  • Estimated Cost to Fix: $300 - $800
  • Recalls: None Found
• Wiring Harness Problems
  • Description/Symptoms: Electrical shorts, intermittent failures of various systems, and difficulty diagnosing the root cause. Often related to chafing or corrosion.
  • Solution: Repair or replacement of damaged wiring harness sections.
  • Estimated Cost to Fix: $100 - $1,000+ (depending on the extent of the damage)
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust developing around wheel wells, rocker panels, and underbody, especially in areas with road salt exposure.
  • Solution: Rust repair, panel replacement, and rust prevention treatments.
  • Estimated Cost to Fix: $200 - $2,000+ (depending on the severity and extent)
  • Recalls: None Found

Interior

• HVAC Blower Motor Resistor Failure
  • Description/Symptoms: Only one or a few blower motor speeds working, or the blower motor not working at all.
  • Solution: Replacement of the blower motor resistor.
  • Estimated Cost to Fix: $50 - $200
  • Recalls: None Found
• Sunroof Issues
  • Description/Symptoms: Sunroof failing to open or close properly, making grinding noises, or leaking.
  • Solution: Sunroof track repair, motor replacement, or complete sunroof assembly replacement.
  • Estimated Cost to Fix: $200 - $1,000+
  • Recalls: None Found

Summary

The 2007 Hummer H3, while capable and stylish, has some common problem areas. The 3.7L engine can suffer from cylinder head cracking and camshaft actuator failure. The 5.3L V8 can have excessive oil consumption. Suspension components like wheel bearings and ball joints are prone to failure. Electrical issues involving the BCM and wiring harnesses can also occur. The 4L60-E transmission can experience issues. Exterior rust is a common concern. Repair costs can range from relatively minor to quite expensive, depending on the specific issue. These factors should be considered when evaluating a 2007 Hummer H3.