The Best GMC Repair in Harriman, TN

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

#1

Roane County Auto & Truck Repair

4.8
(240 reviews)
Verified

A highly reputable, family-owned shop known for its deep expertise in both domestic cars and heavy-duty trucks. They are a local favorite for complex diagnostics and major repairs on GM vehicles, with several technicians holding advanced ASE certifications. They are particularly praised for their honest assessments and high-quality workmanship on diesel and transmission systems.

1285 N Gateway Ave, Rockwood, TN 37854 (Approx. 10 minutes from Harriman)

Specialties & Features

Duramax diesel service
Allison transmission repair
heavy-duty suspension

Business Information

Years in Business:15 years
Licensed:Yes
Insured:Yes
#2

C & C Auto and Diesel

4.6
(180 reviews)
Verified

This shop has built a strong reputation specifically for its work on diesel engines and performance trucks. They are a go-to for Duramax owners needing anything from routine maintenance to complex injector or turbocharger repairs. Their technicians have direct experience with the Allison transmission series and modern GMC electronics.

1412 N Gateway Ave, Rockwood, TN 37854 (Approx. 10 minutes from Harriman)

Specialties & Features

Duramax performance
repair
EcoTec engine diagnostics
towing package maintenance

Business Information

Years in Business:12 years
Licensed:Yes
Insured:Yes
#3

Pro Auto Repair & Tire

4.7
(190 reviews)
Verified

While offering comprehensive general auto repair, Pro Auto has developed a significant niche in servicing late-model GM trucks and SUVs. They receive consistent positive reviews for their work on drivability issues, electrical systems, and 4WD service, making them a strong choice for Denali owners with complex feature sets.

7235 Roane State Hwy, Harriman, TN 37748

Specialties & Features

4WD and towing system service
Denali electronics
transmission service

Business Information

Years in Business:18 years
Licensed:Yes
Insured:Yes

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

** The GMC repair market in Harriman, TN, is characterized by a handful of highly capable independent shops rather than a high volume of competition. There is no standalone GMC dealership within Harriman city limits, which has fostered a strong ecosystem of independent specialists in Roane County. The average quality of these top-tier shops is exceptionally high, as evidenced by their consistent 4.6+ star ratings and large volumes of long-term customer reviews. Pricing is typically more competitive than dealerships in Knoxville, while the level of specialized knowledge for truck and SUV systems (Duramax, Allison, 4WD) is a key point of differentiation from general repair shops. For basic maintenance, several options exist, but for the specialized services requested—particularly diesel and transmission work—the market consolidates around the 2-3 established providers listed above. Consumers benefit from this environment, as the leading shops must maintain high service quality and technical expertise to retain their reputations.

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 Harriman regulations and climate