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2007 GMC C5500 Topkick

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By Research the Car 5 min read

Alright, here is a comprehensive breakdown of common issues and complaints for the 2007 GMC C5500 Topkick, organized by category and component.

The 2007 GMC C5500 Topkick is a medium-duty truck known for its robust build and towing capabilities. Engine options included the Duramax 6.6L diesel V8 (330 hp and 620 lb-ft of torque), the Vortec 8.1L gas V8 (325 hp and 450 lb-ft of torque), and the 6.0L Vortec gas V8(300 hp and 360 lb-ft of torque). Transmission choices were typically an Allison 1000 5-speed automatic for the diesel and a Hydra-Matic 4L80E 4-speed for the gas options, depending on the specific configuration. Owners often appreciate the truck’s power and utility, but some common complaints revolve around fuel economy, ride comfort, and maintenance costs due to the heavy-duty nature of the vehicle.

Engine

Duramax 6.6L Diesel V8 (LMM)

  • Fuel Injector Failure
    • Description/Symptoms: Symptoms include rough idling, black smoke, decreased fuel economy, and a noticeable ticking or knocking sound. This often stems from injector nozzle erosion or internal damage due to fuel contamination.
    • Solution: Replacement of the faulty fuel injector(s). A thorough fuel system cleaning is recommended to prevent recurrence.
    • Estimated Cost to Fix: $500 - $1,000+ per injector, including labor.
    • Recalls: None Found
  • EGR Cooler Failure
    • Description/Symptoms: Cracks in the EGR cooler can lead to coolant leaks, white smoke from the exhaust, and potential overheating.
    • Solution: Replacement of the EGR cooler.
    • Estimated Cost to Fix: $800 - $1,500+, including labor.
    • Recalls: None Found
  • Turbocharger Issues
    • Description/Symptoms: Whining noises, loss of power, excessive black smoke.
    • Solution: Inspect and replace the turbocharger if necessary.
    • Estimated Cost to Fix: $1,500 - $3,000+, including labor.
    • Recalls: None Found

Vortec 8.1L Gas V8

  • Exhaust Manifold Bolts Breakage
    • Description/Symptoms: Ticking noise, especially upon cold starts, and exhaust leaks. Broken bolts are a common issue.
    • Solution: Removal of the broken bolts and replacement of the exhaust manifold gaskets.
    • Estimated Cost to Fix: $400 - $800+, including labor.
    • Recalls: None Found
  • Oil Consumption
    • Description/Symptoms: Increased oil usage, requiring frequent top-offs between oil changes.
    • Solution: Inspect and potentially replace valve stem seals, piston rings, or the PCV valve. In severe cases, an engine rebuild might be needed.
    • Estimated Cost to Fix: $300-$500 for valve stem seals, $500-$1000 for PCV and if the engine is rebuild it would be $3000+
    • Recalls: None Found

Vortec 6.0L Gas V8

  • Oil Consumption
    • Description/Symptoms: Increased oil usage, requiring frequent top-offs between oil changes.
    • Solution: Inspect and potentially replace valve stem seals, piston rings, or the PCV valve. In severe cases, an engine rebuild might be needed.
    • Estimated Cost to Fix: $300-$500 for valve stem seals, $500-$1000 for PCV and if the engine is rebuild it would be $3000+
    • Recalls: None Found

Transmission

Allison 1000 5-Speed Automatic

  • Torque Converter Issues
    • Description/Symptoms: Shuddering during acceleration, especially at low speeds. Can also cause slipping or failure to engage.
    • Solution: Replacement of the torque converter.
    • Estimated Cost to Fix: $800 - $1,800+, including labor.
    • Recalls: None Found
  • Shift Solenoid Failure
    • Description/Symptoms: Erratic shifting, harsh shifts, or failure to shift into certain gears.
    • Solution: Replacement of the affected shift solenoid(s).
    • Estimated Cost to Fix: $300 - $800+, including labor.
    • Recalls: None Found

Hydra-Matic 4L80E 4-Speed Automatic

  • Harsh Shifting
    • Description/Symptoms: Noticeable harsh shifting between gears, particularly 1st to 2nd or 2nd to 3rd.
    • Solution: Diagnosis of the valve body, potentially requiring a rebuild or replacement. Also check the condition of the transmission fluid and filter.
    • Estimated Cost to Fix: $400 - $1,200+
    • Recalls: None Found
  • Slipping
    • Description/Symptoms: Transmission slipping during acceleration, the engine revving without a corresponding increase in speed.
    • Solution: Transmission rebuild or replacement if the clutches are worn.
    • Estimated Cost to Fix: $1,500 - $3,000+
    • Recalls: None Found

Suspension

  • Worn Ball Joints
    • Description/Symptoms: Clunking or rattling noises from the front end, especially when going over bumps. Steering may feel loose.
    • Solution: Replacement of the worn ball joints.
    • Estimated Cost to Fix: $300 - $600+ per side, including labor.
    • Recalls: None Found
  • Leaf Spring Sagging/Cracking
    • Description/Symptoms: The rear of the truck sits lower than normal, leading to a rough ride and reduced load-carrying capacity. Leaf springs may show visible cracks or damage.
    • Solution: Replacement of the leaf springs.
    • Estimated Cost to Fix: $500 - $1,000+ per side, including labor.
    • Recalls: None Found

Electrical

  • Alternator Failure
    • Description/Symptoms: Dimming headlights, warning lights on the dashboard, and eventual battery drain.
    • Solution: Replacement of the alternator.
    • Estimated Cost to Fix: $300 - $600+, including labor.
    • Recalls: None Found
  • Glow Plug Issues (Diesel)
    • Description/Symptoms: Hard starting, especially in cold weather. Diagnostic trouble codes related to glow plugs.
    • Solution: Replacement of the faulty glow plugs.
    • Estimated Cost to Fix: $150 - $400+, including labor.
    • Recalls: None Found
  • Body Control Module (BCM) Problems
    • Description/Symptoms: Intermittent electrical issues, such as power windows not working, door locks malfunctioning, or issues with the instrument cluster.
    • Solution: Diagnosis and possible replacement of the BCM. Reprogramming may be required.
    • Estimated Cost to Fix: $400 - $800+, including labor and programming.
    • Recalls: None Found

Exterior

  • Rust on Undercarriage and Frame
    • Description/Symptoms: Visible rust, especially in areas exposed to road salt. Can compromise structural integrity over time.
    • Solution: Rust removal, treatment, and application of protective coatings. In severe cases, frame repair or replacement may be necessary.
    • Estimated Cost to Fix: $200 - $500+ for rust treatment; significantly more for frame repair or replacement.
    • Recalls: None Found

Interior

  • HVAC Blower Motor Failure
    • Description/Symptoms: The HVAC blower motor stops working, resulting in no air blowing from the vents.
    • Solution: Replacement of the blower motor.
    • Estimated Cost to Fix: $200 - $400+, including labor.
    • Recalls: None Found
  • Instrument Cluster Problems
    • Description/Symptoms: Gauges malfunctioning or displaying incorrect readings. The entire instrument cluster may fail.
    • Solution: Repair or replacement of the instrument cluster.
    • Estimated Cost to Fix: $300 - $700+, including labor and programming.
    • Recalls: None Found

Summary

The 2007 GMC C5500 Topkick, while a capable work truck, can experience a range of issues typical for vehicles of its age and class. Engine problems, particularly fuel injector issues on the Duramax diesel and exhaust manifold problems on the 8.1L gas engine, are common. Transmission issues, especially with the Allison 1000 and 4L80E, can be costly to repair. Suspension and electrical problems also contribute to the overall ownership experience. The severity of these issues can range from minor inconveniences to major repairs, with costs varying accordingly. Potential buyers should carefully inspect the vehicle’s maintenance history and be prepared for potential repairs associated with a medium-duty truck.

GMC, C5500 Topkick
GMC C5500 Topkick 2007
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