Diesel Engine Repair & Diagnostics in Billings, Montana
When a Power Stroke starts smoking, a Cummins loses power under load, or a Duramax throws an injector code, you want a Billings shop that works on diesels every day rather than once a month. The engine and diagnostic specialists here serve Billings and nearby Montana — with scan tools that read manufacturer codes, injector test benches, and mechanics who know which failures are common on your engine before they lift the hood.
50Diesel Engine Repair & Diagnostics Shops
7Open 24 Hours
4.6Average Rating
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All Diesel Engine Repair & Diagnostics Shops in Billings
Summit Garage
Billings, MT
(406) 850-2918
Onsite Mobile Truck Repair
Billings, MT
(406) 272-1143
R&D Mobile Truck Repair Inc
Billings, MT
(406) 200-0251
Affordable Construction Equipment
Billings, MT
(406) 690-0737
BD Equipment Services INC
Billings, MT
(406) 201-7711
RKS Mobile Truck Repair LLC
Billings, MT
(406) 647-9537
I90 Diesel Repair
Billings, MT
24/7
(406) 601-1195
Modern Machinery Co
Billings, MT
(406) 252-2158
Cel Automotive & Diesel Repair
Billings, MT
(406) 656-2342
Big Dog Diesel and Automotive Repair
Billings, MT
(406) 661-2559
H&E Mobile Truck and Equipment Repair
Billings, MT
24/7
(406) 633-0127
Wild West Diesel Repair Inc
Billings, MT
(406) 259-9661
Cory's Auto Repair
Billings, MT
(406) 894-2040
HIGGINS DIESEL TRUCK REPAIR
Billings, MT
(406) 200-2621
Auto & Truck Repair (Cal Cole proprietor)
Billings, MT
(406) 252-3807
Big Rig Repair
Billings, MT
(406) 252-8413
FM Performance Parts Diesel & Auto Repair
Billings, MT
(406) 245-2886
Signature Fuel Systems
Billings, MT
(406) 255-0858
Castro Cepak Motorsports Diesel & Auto Repair
Billings, MT
(406) 850-0201
The Truck Shop of Billings Inc.
Billings, MT
(406) 254-2400
The Diesel Schopp & Auto Repair
Billings, MT
(406) 861-8303
Inland Truck Parts & Service
Billings, MT
(406) 248-7349
Beartooth Repair
Billings, MT
(406) 794-4455
G & J Diesel Sales and Service, Inc.
Billings, MT
(406) 248-6366
ProSource Machinery - Billings
Billings, MT
(406) 272-3497
Koch's Diesel Repair
Billings, MT
24/7
(406) 598-0397
Jakes Automotive & Diesel Repair
Billings, MT
(406) 839-2214
H&E Equipment Services
Billings, MT
(406) 259-9720
Arnold Machinery Company
Billings, MT
(406) 927-5271
Yellowstone Valley Parts & Equipment
Billings, MT
(406) 373-6606
Pro Tech Automotive & Diesel
Billings, MT
(406) 238-0003
Tractor & Equipment Co.
Billings, MT
(406) 656-0202
Kw Mechanical Services
Billings, MT
(406) 213-9991
Walls Mobile Truck & Auto Repair
Billings, MT
24/7
(406) 694-9948
Christian Brothers Automotive Billings
Billings, MT
(406) 420-6648
MH Equipment & Ag Resources
Billings, MT
(406) 373-9800
Reds Automotive and Diesel
Billings, MT
(406) 671-3975
Interstate Power Systems
Billings, MT
(406) 252-4191
Top Tech Automotive
Billings, MT
(406) 313-8788
PSC
Billings, MT
(406) 256-4933
Cummins Sales and Service
Billings, MT
(406) 245-4194
I-State Truck Centers
Billings, MT
(406) 252-5121
B&R Repair Inc
Billings, MT
(406) 259-9971
Diesel Xtreme
Billings, MT
(406) 670-6168
GCR Tires & Service
Billings, MT
(406) 245-8985
Wicked Diesel Auto Specialists
Billings, MT
(406) 371-7260
Yellowstone Truck Service
Billings, MT
24/7
(406) 690-1052
Tri-State Truck & Equipment
Billings, MT
(406) 245-3188
Billings Mobile Truck Repair
Billings, MT
24/7
(406) 780-3711
Makeeff Repair, Inc.
Billings, MT
24/7
(406) 200-4105
Diesel Engine Repair & Diagnostics FAQ — Billings, Montana
My check-engine light is on but the truck runs fine — do I really need a diesel diagnostic?
Yes, and sooner rather than later. On a modern diesel the light often means an emissions, sensor, or fuel-pressure fault that has not become a driveability problem yet. A Billings diesel shop can pull the code, read live data, and tell you whether it is a $40 sensor or the early sign of a failing injector. Diagnostic time is normally billed as a flat fee or one hour of labor.
How do I know a Billings shop is a real diesel specialist and not a general garage that "also does diesel"?
Ask what scan tool they use for your engine, whether they have replaced injectors on your platform this month, and how they test fuel pressure and contribution. Specialists answer in specifics — Ford IDS, Cummins INSITE, GM GDS2, balance rates, HPOP pressure. Their reviews will mention specific repairs, not just oil changes.
What are the most common engine repairs on diesel pickups in Montana?
Across the state the same handful of jobs come up: injector replacement, turbo actuator and vane failures, high-pressure fuel pump or CP4 failures, EGR cooler leaks, head gasket and stud jobs on 6.0 Power Strokes, and fuel contamination from bad diesel or water in the tank. Cold Montana mornings also expose weak glow plugs and batteries.
How long does a typical diesel engine repair take?
A diagnostic and sensor swap can be same-day. A full injector set is usually one to three days depending on parts. Turbo replacement runs one to two days. Head gaskets and in-frame rebuilds are measured in weeks, not days, because of machine-shop time — ask your Billings shop for a realistic window and whether they can source parts before you drop the truck off.
Are aftermarket parts fine for diesel engine repairs, or should I insist on OEM?
For injectors, high-pressure pumps, and turbos, most experienced mechanics steer you to OEM or a reputable remanufacturer with a real warranty — cheap injectors are the top cause of comebacks. Filters, sensors, gaskets, and hardware from a quality aftermarket brand are generally fine. Get the part brand and warranty terms in writing on the estimate.