Diesel Diagnostics
Advanced testing to find drivability, warning-light and performance problems accurately.
Services
Built Around Duramax. Backed by Experience.
Duramax Service & Allison Transmission Repair in Holland, MI
Merchant Automotive is West Michigan's trusted source for Duramax diesel and Allison transmission diagnostics, maintenance and repair. Our experienced technicians deliver honest answers and workmanship built around your truck.
Since 2004Trusted for 20+ years
Duramax FocusedOur specialty
Allison ExperienceSpecialized, real-world
Holland, MIWest Michigan's diesel shop
Our Commitment
Duramax Isn't One Part of Our Business. It's What We Were Built Around.
From routine maintenance to complex repairs, our technicians specialize in Duramax engines and Allison transmissions. We combine deep technical experience with straightforward communication, so you understand what your truck needs and why.
Request an AppointmentAll Duramax Generations
Every Duramax Platform Is Welcome
Merchant Automotive services all Duramax diesel engine generations, from early LB7 trucks through today's Duramax platforms. Supporting Chevrolet and GMC Duramax owners has been the foundation of our business since 2004.
6.6L Duramax
Chevrolet and GMC HD Trucks
Complete service across the generations that built the Duramax name.
Engine generations: LB7, LLY, LBZ, LMM, LML and L5P
3.0L Duramax
Light-Duty Trucks and SUVs
Diagnostics, maintenance and repair for both generations of the inline-six Duramax.
Engine generations: LM2 and LZ0
2.8L Duramax
Colorado and Canyon
Specialized service for Chevrolet Colorado and GMC Canyon diesel applications.
Engine generation: LWN
Our Services
Complete Service for Your Duramax and Allison
Whether you need routine maintenance, a difficult diagnosis or a major repair, our team can evaluate the entire truck and explain the next step clearly.
Engine & Fuel Systems
Duramax engine, fuel-system, cooling and turbocharger diagnosis and repair.
Allison Transmissions
Allison 1000 and 10L1000 diagnostics, maintenance, repair and transmission builds.
Driveline & Transfer Cases
Service and repair for transfer cases, differentials, driveshafts and driveline components.
Factory Emissions Systems
Diagnostics, maintenance and compliant repair for factory diesel emissions systems.
Chassis & Electrical
Suspension, steering and electrical diagnostics that keep your truck dependable.
Not sure which service you need? Tell us what your truck is doing and our service team will help determine the right next step.
Request an AppointmentReal People. Real Work.
Specialized Diesel Experience You Can See
Our team brings decades of diesel experience to every job. This isn't just what we do. It's what we know.
Google Customer Reviews
Trusted by Duramax and Allison Owners
Real experiences from customers who trusted Merchant Automotive with their trucks.
★★★★★
Honest Allison Diagnosis
After two other shops recommended a complete transmission replacement, Merchant diagnosed and repaired the actual wiring problem.
“They found the real issue and repaired it.”
Matt HitchcockGoogle review
Read on Google★★★★★
L5P Help When It Mattered
Merchant helped diagnose an injector-pigtail problem and got an out-of-state customer safely back on the road.
“Customer service was above and beyond genuine.”
Jonathan BusGoogle review
Read on Google★★★★★
Service That Earned Repeat Business
After Merchant diagnosed collapsed fuel lines, this customer returned for additional Duramax and transmission work.
“Overall their products are great, served with amazing customer service.”
Ian WilsonGoogle review
Read on GoogleOur Service Process
Clear Answers From Scheduling to Repair
- Request an appointmentTell us about your truck and the concern.
- DiagnoseWe inspect and test before recommending repairs.
- Approve the workYou receive clear findings and repair options.
- Get back on the roadQuality service with communication throughout.
Frequently Asked Questions
Service Questions
Do you only work on Duramax trucks?
Duramax and Allison service remain our specialty. We also service select Ford Power Stroke and Ram Cummins trucks. Contact us with your year, model, engine and service need so our team can confirm availability.
What Duramax services do you provide?
We provide diagnostics, maintenance, engine and fuel-system repair, factory emissions-system repair, electrical and chassis work, transfer-case and driveline service, and Allison transmission service.
How do I schedule service?
Use the appointment request form or call (616) 772-9551. Please include the truck's year, make, model, engine, mileage and a description of the concern.
Where is Merchant Automotive located?
Our service facility is at 286 Hedcor Street in Holland, Michigan. We serve diesel truck owners throughout West Michigan, including Grand Rapids, Muskegon, Kalamazoo and Lansing.
Get Your Truck Back to Work
Merchant Automotive · 286 Hedcor Street, Holland, MI 49423
Open Monday-Friday, 8:00 AM-5:00 PM
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