2020 GMC Sierra

Introduction to the 2020 GMC Sierra

The 2020 GMC Sierra is a full-size pickup truck that offers a range of engine and transmission options. The gas-powered engines include a 4.3-liter V6 (285 horsepower, 305 lb-ft of torque), a 5.3-liter V8 (355 horsepower, 383 lb-ft of torque), and a 6.2-liter V8 (420 horsepower, 460 lb-ft of torque). Diesel-powered options include a 3.0-liter inline-six (277 horsepower, 460 lb-ft of torque) and a 6.6-liter V8 (445 horsepower, 910 lb-ft of torque). Transmission options include a six-speed automatic, eight-speed automatic, and 10-speed automatic.

The Sierra is known for its spacious interior, powerful engines, and towing and payload capabilities, but it has also been reported to have some issues.

Engine

4.3-liter V6

• Fuel Injector Failure
  • Description/Symptoms: Engine misfires, rough idling, decreased fuel efficiency
  • Solution: Replace faulty fuel injectors
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found
• Intake Manifold Gasket Leak
  • Description/Symptoms: Coolant or oil leaks, overheating, loss of power
  • Solution: Replace intake manifold gasket
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found

5.3-liter V8

• Active Fuel Management (AFM) Issues
  • Description/Symptoms: Hesitation, engine vibration, excessive fuel consumption
  • Solution: Disable AFM using a tuner or replacing lifters
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found

6.2-liter V8

• No Issues Found

3.0-liter Inline-Six Diesel

• Exhaust Gas Recirculation (EGR) System Malfunction
  • Description/Symptoms: Check engine light, decreased power, increased emissions
  • Solution: Clean or replace EGR valve and cooler
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found
• Diesel Particulate Filter (DPF) Issues
  • Description/Symptoms: Reduced engine performance, increased fuel consumption
  • Solution: Regenerate or replace DPF
  • Estimated Cost to Fix: $1,000 - $3,000+
  • Recalls: None Found

6.6-liter V8 Diesel

• Turbocharger Failure
  • Description/Symptoms: Loss of power, excessive smoke, loud noises from engine
  • Solution: Replace turbocharger
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found

Transmission

Six-Speed Automatic

• Torque Converter Shudder
  • Description/Symptoms: Vibration or shuddering during acceleration or shifting
  • Solution: Replace torque converter
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found
• Transmission Surges
  • Description/Symptoms: Sudden acceleration or deceleration while driving
  • Solution: Update transmission software or replace transmission
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Eight-Speed Automatic

• No Issues Found

Ten-Speed Automatic

• Shifting Problems
  • Description/Symptoms: Delayed or harsh shifting, difficulty shifting into certain gears
  • Solution: Update transmission software or replace transmission
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Suspension

• Leaking Front Shocks
  • Description/Symptoms: Reduced ride quality, uneven tire wear
  • Solution: Replace front shocks
  • Estimated Cost to Fix: $500 - $1,000+
  • Recalls: None Found

Electrical

• Tailgate Wiring Harness Issues
  • Description/Symptoms: Tailgate not opening or closing, brake lights or turn signals not working
  • Solution: Replace tailgate wiring harness
  • Estimated Cost to Fix: $300 - $500+
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Battery dies prematurely after sitting
  • Solution: Diagnose and repair or replace faulty components
  • Estimated Cost to Fix: $100 - $1,000+
  • Recalls: None Found

Exterior

• Door Lock Actuator Failure
  • Description/Symptoms: Difficulty locking or unlocking doors
  • Solution: Replace door lock actuator
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found

Interior

• Infotainment System Lag
  • Description/Symptoms: Slow response or freezing of the touchscreen
  • Solution: Update software or replace infotainment system
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found
• Climate Control Malfunction
  • Description/Symptoms: Heating or cooling not working properly
  • Solution: Diagnose and repair or replace faulty components
  • Estimated Cost to Fix: $200 - $1,000+
  • Recalls: None Found

Summary

The 2020 GMC Sierra has been reported to have some issues, particularly with its engines and transmissions. These issues can range in severity and cost, with some requiring major repairs. However, it’s important to note that these issues may not be present in all Sierras and that many owners have been satisfied with their vehicles.