The Best GMC Repair in Dekalb, IL

Compare the highest-rated gmc repair mechanics in Dekalb, Illinois. All shops are licensed, insured, and verified through our rigorous screening process.

#1

DeKalb County GM

4.5
(180 reviews)
Verified

As the area's primary authorized GMC dealership, this is the go-to for complex electrical diagnostics, warranty work, and factory-level service. They have the proprietary GM tools and software updates required for the latest models, especially Denali trims. Their technicians are GM-certified and receive direct factory training.

2105 Peace Rd, Sycamore, IL 60178

Specialties & Features

Denali luxury features and electronics
Allison transmission repair
EcoTec engine diagnostics

Business Information

Years in Business:20 years
Licensed:Yes
Insured:Yes
#2

TLC Truck & Auto Repair

4.8
(240 reviews)
Verified

A highly reputable independent shop with a stellar reputation for specializing in American trucks and diesel service. Reviews consistently praise their expertise, honesty, and quality of work on Duramax engines and complex drivetrain issues. They are a top alternative to the dealership for owners of older or out-of-warranty GMCs.

1026 S 4th St, DeKalb, IL 60115

Specialties & Features

Duramax diesel service
Heavy-duty truck suspension
4WD and towing system service

Business Information

Years in Business:15 years
Licensed:Yes
Insured:Yes
#3

Advanced Automotive of DeKalb

4.6
(150 reviews)
Verified

A well-established local shop known for its technical depth and ability to handle a wide range of repairs, from routine maintenance to advanced diagnostics. They have invested in high-quality scan tools and have experienced technicians capable of working on GM's 10-speed transmissions and towing system integrations.

1026½ S 4th St, DeKalb, IL 60115

Specialties & Features

Transmission repair (Allison
10-speed)
Towing package maintenance
General GMC service and diagnostics

Business Information

Years in Business:25 years
Licensed:Yes
Insured:Yes

Why These Are the Top GMC Repair Auto Repair Shops in Dekalb

** The GMC repair market in DeKalb is characterized by a clear dichotomy between the authorized dealership and a small number of highly competent independent shops. The overall quality is high, with several providers capable of servicing the core needs of GMC owners. **DeKalb County GM** holds a monopoly on factory-backed services, software, and warranty repairs, commanding premium pricing. The independent market, led by shops like **TLC Truck & Auto** and **Advanced Automotive**, offers competitive, often lower, labor rates and is particularly strong with mechanical systems (diesel, suspension, drivetrain). These independents have built their reputation on personalized service and deep expertise with the powertrains that are common in the region. Competition is moderate; while there are many general auto repair shops, true specialists for complex GMC systems are limited, ensuring steady business for the top-tier providers listed. Typical pricing follows the industry standard: dealership rates are the highest, followed by the specialized independents, with general repair shops being the most affordable but often lacking the specific expertise for Duramax or Allison systems.

High Ratings

4.7+ star average from verified customer reviews

Fully Licensed

All shops are properly licensed and insured

Proven Experience

10+ years average experience in the industry

Local Experts

Familiar with Dekalb regulations and climate