2009 GMC C5500 Topkick

The 2009 GMC C5500 Topkick is a medium-duty truck known for its durability and hauling capabilities. While appreciated for its robust build and utility, some owners have reported encountering various issues. Engine options include the Duramax 6.6L diesel V8, producing around 330 horsepower and 620 lb-ft of torque, and the Vortec 8.1L gasoline V8, producing around 325 horsepower and 450 lb-ft of torque. The transmission options include the Allison 1000 6-speed automatic. Some common complaints include electrical issues, particularly with the wiring harness, and concerns related to the diesel engine’s emissions system.

Engine

Duramax 6.6L Diesel V8 (LMM)

• Fuel Injector Failure
  • Description/Symptoms: Rough idling, misfires, decreased fuel economy, black smoke from exhaust.
  • Solution: Replace faulty fuel injectors. Often requires replacing all injectors at once for best results.
  • Estimated Cost to Fix: $4,000 - $8,000+
  • Recalls: None Found
• Diesel Particulate Filter (DPF) Issues
  • Description/Symptoms: Clogged DPF, reduced engine power, frequent regeneration cycles, “Reduced Engine Power” warning, and diagnostic trouble codes (DTCs) related to DPF pressure.
  • Solution: Forced regeneration, DPF cleaning, or DPF replacement if cleaning is not successful. Consider DPF delete (check local laws).
  • Estimated Cost to Fix: $1,500 - $3,000+ (DPF replacement); Delete kits vary in price.
  • Recalls: None Found
• EGR Cooler Failure
  • Description/Symptoms: Coolant loss, white smoke from exhaust, overheating, possible engine damage if coolant enters cylinders.
  • Solution: Replace EGR cooler.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found

Vortec 8.1L Gasoline V8

• Intake Manifold Gasket Leak
  • Description/Symptoms: Coolant leak, rough idle, misfires, and coolant in the oil.
  • Solution: Replace intake manifold gaskets.
  • Estimated Cost to Fix: $500 - $1,000
  • Recalls: None Found
• Oil Consumption
  • Description/Symptoms: Burning oil, low oil level, blue smoke from exhaust.
  • Solution: Address underlying issues like worn valve stem seals or piston rings. This may require a partial or full engine rebuild.
  • Estimated Cost to Fix: $1,000 - $5,000+ depending on the severity and repair approach.
  • Recalls: None Found

Transmission

Allison 1000 6-Speed Automatic

• Torque Converter Clutch (TCC) Failure
  • Description/Symptoms: Shuddering during lockup, transmission slipping, Diagnostic Trouble Codes (DTCs).
  • Solution: Replace torque converter.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, slipping, failure to shift, DTCs related to shift solenoids or valve body performance.
  • Solution: Replace or rebuild valve body.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found
• Internal Leakage/Overheating
  • Description/Symptoms: Transmission fluid leaks, overheating, poor shifting performance.
  • Solution: Diagnose and repair leaks. May involve replacing seals, gaskets, or other internal components. Ensure proper cooling system function.
  • Estimated Cost to Fix: $500 - $2,500+ depending on the source of the leak and extent of damage.
  • Recalls: None Found

Suspension

• Front End Wear
  • Description/Symptoms: Loose steering, wandering, uneven tire wear, clunking noises.
  • Solution: Inspect and replace worn ball joints, tie rod ends, pitman arm, idler arm, and control arm bushings.
  • Estimated Cost to Fix: $500 - $2,000+ depending on the number of components needing replacement.
  • Recalls: None Found

Electrical

• Wiring Harness Issues
  • Description/Symptoms: Intermittent electrical problems, including lights, gauges, or starting issues, caused by chafed or corroded wires.
  • Solution: Inspect and repair or replace damaged sections of the wiring harness.
  • Estimated Cost to Fix: $200 - $1,000+ depending on the extent of the damage and labor involved.
  • Recalls: None Found
• Glow Plug System Malfunctions (Diesel)
  • Description/Symptoms: Hard starting in cold weather, white smoke from exhaust on startup, glow plug system warning light.
  • Solution: Replace faulty glow plugs, glow plug control module, or wiring.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Exterior

• Corrosion
  • Description/Symptoms: Rust on the frame, body panels, and undercarriage, especially in areas with road salt exposure.
  • Solution: Rust repair, body panel replacement, and rustproofing treatments.
  • Estimated Cost to Fix: Varies greatly depending on the extent of the rust. $500 - $5,000+
  • Recalls: None Found

Interior

• HVAC Blower Motor Failure
  • Description/Symptoms: Blower motor doesn’t work or only works on certain settings, reduced airflow.
  • Solution: Replace blower motor or blower motor resistor.
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Summary

The 2009 GMC C5500 Topkick is generally a reliable work truck, but owners should be aware of potential issues, particularly with the Duramax diesel engine and the Allison transmission. Engine issues like fuel injector failure, DPF problems, and EGR cooler failures can be costly to repair. Electrical and suspension problems are also common areas of concern. The severity and cost of these issues can vary greatly depending on the truck’s maintenance history, usage, and geographical location. Thorough inspection and maintenance are essential to minimize potential problems.