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The Road Bumps of the GMC Sierra: A Review of 2020-2023 Mechanical Problems

The GMC Sierra has long been known as a reliable and powerful pickup truck, revered by truck enthusiasts and professionals alike. However, like any vehicle, the Sierra has not been immune to mechanical issues. Between the years 2020 and 2023, some models have experienced problems that have left owners frustrated and concerned. In this article, we will explore some of the common mechanical problems reported in the GMC Sierra during this period.


Common complaints about GMC Sierra vehicles that could potentially lead to lemon law claims include issues that significantly affect the safety, value, or use of the vehicle. If you are experiencing the issues below with your GMC Sierra, please fill out our intake form to see if your GMC vehicle qualifies for a Lemon Law Claim.

Keep in mind that the specific complaints can vary depending on the model year and production batch.

Transmission Troubles

One of the most significant issues reported with the GMC Sierra during 2020-2023 relates to the transmission system. Several owners have complained of rough shifting, delayed gear changes, and even complete transmission failures. These problems have been attributed to faulty software programming, torque converter issues, and solenoid failures.

While GMC has issued software updates and recalls to address these concerns, some drivers have still faced persistent problems even after repairs.

Brake Problems

Brake-related issues have also troubled GMC Sierra owners during this period. Reports of brake fluid leaks, premature brake pad wear, and brake pedal pulsation have surfaced. Brake fluid leaks can lead to a loss of braking performance, compromising the safety of both the driver and other road users. Although GMC has addressed these issues through service bulletins and recalls, it has caused inconveniences and expenses for owners.

Suspension Woes

The GMC Sierra’s suspension system has been the source of headaches for some owners. Reports of excessive bouncing, clunking noises, and uneven tire wear have emerged. The suspension issues are attributed to faulty shocks, struts, or suspension components. Drivers have expressed frustration, as these problems affect the vehicle’s ride comfort and handling. GMC has provided repairs under warranty for some cases, but others have faced out-of-pocket expenses.

Electrical Glitches

Electrical problems have surfaced in the Sierra during this period, causing concerns among owners. Malfunctions in the infotainment system, dashboard display, and various sensors have been reported. These issues can lead to inconvenience and reduced functionality of essential systems, such as air conditioning, power windows, and safety features. While GMC dealerships have attempted to fix the problems, recurring electrical issues have caused frustration for owners.

Engine Performance Issues

Some GMC Sierra owners have faced engine-related problems that have affected performance and fuel efficiency. Complaints of rough idling, stalling, and reduced power have been prevalent. These issues are often linked to faulty fuel injectors, ignition coils, or engine control modules. While GMC has provided repairs for affected vehicles, the recurring nature of some problems has raised concerns about the long-term reliability of the Sierra’s powertrain.

HVAC System Malfunctions

Heating, ventilation, and air conditioning (HVAC) system malfunctions have also been reported in the GMC Sierra during this period. Owners have complained of issues such as a malfunctioning blower motor, inadequate cooling, and cabin temperature irregularities. In extreme cases, refrigerant leaks have been detected. While GMC has addressed these concerns through recalls and warranty repairs, some owners have faced difficulties obtaining timely fixes.


The GMC Sierra has been a staple in the truck market, cherished for its performance and reliability. However, between 2020 and 2023, the model experienced several mechanical problems that caused headaches for owners. Issues with the transmission, brakes, suspension, electrical systems, engine, and HVAC have been reported. While GMC has taken steps to address these problems through recalls and warranty repairs, some owners have faced recurring issues and unexpected out-of-pocket expenses.

As with any vehicle, it is essential to stay vigilant about potential mechanical problems and address them promptly to prevent further damage. It is advisable for prospective buyers to research and consider consumer feedback before making a purchase, ensuring they choose a model that aligns with their expectations and needs. As GMC continues to refine and improve its Sierra lineup, owners hope that these mechanical issues will be resolved in future models, restoring the truck’s reputation as a reliable and capable workhorse.

If you think your GMC Sierra is a Lemon,
Fill out our intake form now to see if your truck qualifies for a Lemon Law Claim.
If it does qualify, you may get a new truck replacement or refund!

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