2007 GMC Sierra 2500 HD Classic

The 2007 GMC Sierra 2500 HD Classic is a heavy-duty pickup truck known for its towing capacity and durability. This model year is the “Classic” body style, which is essentially a carry-over from the previous generation, offered alongside the newly redesigned 2007 models. Engine options include a 6.0L Vortec gas V8 (300 hp, 360 lb-ft of torque), an 8.1L Vortec gas V8 (330 hp, 450 lb-ft of torque), and a 6.6L Duramax diesel V8 (360 hp, 650 lb-ft of torque). Transmission options are typically a 4-speed automatic with the gas engines and a 6-speed Allison automatic with the Duramax diesel. Owners often appreciate the truck’s robust performance and reliability, particularly for heavy-duty tasks, while some common complaints revolve around fuel economy and maintenance costs, especially for the diesel models.

Engine

6.0L Vortec Gas V8

• Oil Consumption
  • Description/Symptoms: Excessive oil consumption, requiring frequent oil top-offs between changes. May be accompanied by blue exhaust smoke.
  • Solution: Replacing valve stem seals or piston rings may address the issue. In severe cases, engine replacement is necessary.
  • Estimated Cost to Fix: $500 - $5,000+
  • Recalls: None Found

8.1L Vortec Gas V8

• Exhaust Manifold Bolts Breaking
  • Description/Symptoms: Ticking noise, especially when the engine is cold. Often caused by broken exhaust manifold bolts.
  • Solution: Replacing broken bolts, and potentially the manifold itself, is the typical repair.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

6.6L Duramax Diesel V8 (LBZ)

• Fuel Injector Failure
  • Description/Symptoms: Rough idling, white smoke from the exhaust, decreased fuel economy, and potential engine knocking.
  • Solution: Replacing faulty fuel injectors is the necessary repair. Often recommended to replace all injectors at the same time to ensure balanced performance.
  • Estimated Cost to Fix: $2,000 - $5,000+
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: Whining or screeching noise from the turbocharger, decreased power, black smoke from the exhaust.
  • Solution: Turbocharger inspection and repair or replacement may be required.
  • Estimated Cost to Fix: $1,500 - $3,500+
  • Recalls: None Found
• Glow Plug Failure
  • Description/Symptoms: Hard starting, especially in cold weather.
  • Solution: Replacing the faulty glow plugs.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Transmission

4-Speed Automatic (Gas Engines)

• Transmission Slipping
  • Description/Symptoms: Transmission slips during shifts, struggles to find the correct gear, and/or flares between gear changes. Can be caused by worn clutches or low fluid levels.
  • Solution: A transmission fluid flush and filter change may alleviate minor slipping. More severe cases may require a rebuild or replacement.
  • Estimated Cost to Fix: $150 - $3,000+
  • Recalls: None Found

6-Speed Allison Automatic (Diesel Engines)

• Torque Converter Issues
  • Description/Symptoms: Shuddering or vibration at low speeds, particularly during lockup of the torque converter.
  • Solution: Replacing the torque converter is the most common fix.
  • Estimated Cost to Fix: $1,000 - $2,500+
  • Recalls: None Found
• Shift Solenoid Failure
  • Description/Symptoms: Harsh or erratic shifting. Transmission may get stuck in a certain gear, or may not shift at all.
  • Solution: Replacing the faulty shift solenoids or valve body.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Suspension

• Leaf Spring Sagging/Breaking
  • Description/Symptoms: Rear end of the truck sagging, especially when loaded. Possible cracking or breaking of the leaf springs.
  • Solution: Replacing the leaf springs.
  • Estimated Cost to Fix: $500 - $1,200+
  • Recalls: None Found
• Ball Joint Wear
  • Description/Symptoms: Clunking noise when going over bumps, loose steering.
  • Solution: Replacing worn ball joints.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Electrical

• Instrument Cluster Problems
  • Description/Symptoms: Gauges (speedometer, tachometer, fuel gauge, etc.) malfunctioning or displaying inaccurate readings.
  • Solution: Repairing or replacing the instrument cluster.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• Body Control Module (BCM) Issues
  • Description/Symptoms: Intermittent electrical issues such as power windows not working, door locks malfunctioning, or lights flickering.
  • Solution: Replacing the BCM.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Exterior

• Rust on Rocker Panels and Cab Corners
  • Description/Symptoms: Rust developing on the rocker panels and cab corners.
  • Solution: Rust repair or replacement of the affected panels.
  • Estimated Cost to Fix: $500 - $2,000+ per panel depending on severity
  • Recalls: None Found
• Tailgate Hinge Failure
  • Description/Symptoms: Tailgate hinges breaking or becoming damaged, leading to difficulty opening and closing the tailgate.
  • Solution: Replacing the tailgate hinges.
  • Estimated Cost to Fix: $100 - $300+
  • Recalls: None Found

Interior

• Dashboard Cracking
  • Description/Symptoms: Cracks appearing on the dashboard, particularly in areas exposed to sunlight.
  • Solution: Replacement of the dashboard or use of a dashboard cover.
  • Estimated Cost to Fix: $200 - $1,000+
  • Recalls: None Found

Summary

The 2007 GMC Sierra 2500 HD Classic, while a capable workhorse, has its share of potential issues. Engine problems, particularly with the Duramax diesel (fuel injectors, turbo) can be costly. Transmission issues, regardless of the engine, are also prevalent. Suspension wear and rust are also areas to inspect closely. Overall, potential buyers should be aware of these common problems and factor in possible repair costs when considering this truck.