2008 GMC T7500

Introduction:

The 2008 GMC T7500 is a heavy-duty truck available with various engine and transmission options. It offers robust performance and impressive towing and hauling capabilities. People appreciate its durability, spacious cabin, and powerful engines. However, like any vehicle, it has some reported issues that owners have encountered.

Engine

• Vortec 6.6L V8 Diesel

  • Intake Manifold Failure:
    • Description/Symptoms: Cracking or warping of the intake manifold, resulting in coolant leaks, reduced engine power, and poor fuel economy.
    • Solution: Replacement of the intake manifold.
    • Estimated Cost to Fix: $1,000 - $2,000+
    • Recalls: None Found
  • Exhaust Gas Recirculation (EGR) System Issues:
    • Description/Symptoms: Malfunctioning EGR valve or clogged EGR cooler, leading to increased emissions, decreased fuel economy, and potential engine damage.
    • Solution: Diagnosis and repair of the EGR system, including valve replacement or cooler cleaning.
    • Estimated Cost to Fix: $200 - $1,000+
    • Recalls: None Found
  • Fuel Injector Failures:
    • Description/Symptoms: Leaking or clogged fuel injectors, causing engine misfires, rough idling, and decreased fuel efficiency.
    • Solution: Replacement of faulty fuel injectors.
    • Estimated Cost to Fix: $200 - $800+
    • Recalls: None Found

• Duramax 6.6L V8 Diesel

  • CP4 Fuel Pump Failure:
    • Description/Symptoms: Failure of the high-pressure fuel pump, resulting in loss of power, starting difficulties, and potential engine damage.
    • Solution: Replacement of the fuel pump.
    • Estimated Cost to Fix: $2,000 - $4,000+
    • Recalls: None Found
  • Turbocharger Issues:
    • Description/Symptoms: Turbocharger failure or sticking, leading to decreased boost pressure, reduced engine power, and increased smoke.
    • Solution: Diagnosis and repair of the turbocharger system.
    • Estimated Cost to Fix: $500 - $2,000+
    • Recalls: None Found

Transmission

• Allison 1000 Transmission:

  • Torque Converter Failure:
    • Description/Symptoms: Slipping or shuddering of the torque converter during gear changes, leading to reduced power transfer and potential transmission damage.
    • Solution: Replacement of the torque converter.
    • Estimated Cost to Fix: $1,000 - $3,000+
    • Recalls: None Found
  • Transmission Fluid Leaks:
    • Description/Symptoms: Leakage of transmission fluid from various seals or gaskets, resulting in reduced fluid levels and potential transmission failure.
    • Solution: Identification and repair of the source of the leak.
    • Estimated Cost to Fix: $100 - $500+
    • Recalls: None Found

• Allison 2500 Transmission:

  • Gears Slipping:
    • Description/Symptoms: Gears disengaging or slipping during driving, causing a loss of power and difficulty in shifting.
    • Solution: Diagnosis and repair of the transmission, including replacement of faulty gears or components.
    • Estimated Cost to Fix: $1,500 - $5,000+
    • Recalls: None Found
  • Overheating Issues:
    • Description/Symptoms: Excessive transmission temperatures, resulting in decreased performance, increased wear and tear, and potential transmission failure.
    • Solution: Diagnosis and repair of the cooling system, including fluid flush, replacement of coolers, and repair of cooling lines.
    • Estimated Cost to Fix: $200 - $1,000+
    • Recalls: None Found

Suspension

• Leaf Spring Breakage:
  • Description/Symptoms: Cracking or breakage of the leaf springs, resulting in decreased ride quality, sagging, and potential alignment issues.
  • Solution: Replacement of the broken leaf springs.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found
• Shock Absorber Failure:
  • Description/Symptoms: Worn or damaged shock absorbers, leading to a bouncy or unstable ride, poor handling, and increased tire wear.
  • Solution: Replacement of the faulty shock absorbers.
  • Estimated Cost to Fix: $100 - $400+
  • Recalls: None Found

Electrical

• Electrical System Faults:
  • Description/Symptoms: Malfunctioning sensors, wiring issues, or computer failures, causing various electrical problems such as inoperative lights, gauges, or accessories.
  • Solution: Diagnosis and repair of the affected electrical components.
  • Estimated Cost to Fix: $200 - $1,000+
  • Recalls: None Found
• Battery Drain:
  • Description/Symptoms: Rapid battery discharge while the vehicle is parked, indicating a parasitic drain from an electrical component.
  • Solution: Isolation and repair of the source of the drain.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Exterior

• Headlight Condensation:
  • Description/Symptoms: Moisture buildup inside the headlight housings, reducing visibility and potentially leading to electrical issues.
  • Solution: Replacement of the headlight housings or modification to improve ventilation.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• Tailgate Latch Failure:
  • Description/Symptoms: Malfunctioning tailgate latch, causing the tailgate to open unexpectedly or become difficult to open or close.
  • Solution: Replacement of the tailgate latch assembly.
  • Estimated Cost to Fix: $100 - $300+
  • Recalls: None Found

Interior

• Dashboard Noise:
  • Description/Symptoms: Rattling or buzzing noises coming from the dashboard or instrument panel.
  • Solution: Identification and tightening of loose components or replacement of faulty parts.
  • Estimated Cost to Fix: $100 - $400+
  • Recalls: None Found
• HVAC System Issues:
  • Description/Symptoms: Malfunctioning heater, air conditioning, or ventilation system, resulting in inadequate heating or cooling, poor air flow, or noisy operation.
  • Solution: Diagnosis and repair of the HVAC system, including component replacement or refrigerant recharge.
  • Estimated Cost to Fix: $200 - $1,000+
  • Recalls: None Found

Summary

Overall, the 2008 GMC T7500 is a reliable and capable heavy-duty truck, but it is not without its reported issues. The majority of the issues are related to the engine and transmission, with some potential electrical and suspension problems. The severity of the issues varies, and the cost of repairs can be significant in some cases. It is recommended to stay informed about these issues and to have regular maintenance performed to address any potential problems early on.