We work on diesel trucks every day and we know them inside and out. No guesswork, no overselling — just an honest diagnosis and a repair plan you approve before we touch anything. Fill out the form to get a quote.
From routine maintenance to major repairs, we handle all makes and models of gas-powered cars and trucks with the same standard we hold ourselves to on everything else. You will always know what is wrong and what it costs before we start. Fill out the form to get a quote.
Just looking to make sure your truck is ready for daily duty? We can handle all your fluid flushes/changes and general service items to extend the life of your engine.
We aren’t the guys that just throw money at a problem with your diesel truck to fix it. We take the time to do a through diagnosis to ensure we can be a cost effective with your money as possible.
Whether you need a new turbo, a full motor rebuild or anything in between – we can det your Duramax, Cummins, or PowerStroke running like new in no time.
WARNING:
We pride ourselves on doing work the RIGHT way, if you want stuff half-*ssed, take your truck elsewhere.





























General Service & Fluid Changes
Turbo Replacements
Glow Plug Inspection/Replacement
EGR System Cleaning
DPF Regeneration or Cleaning
And More!

General Service & Fluid Changes
Turbo Replacements
Glow Plug Inspection/Replacement
DPF Regeneration or Cleaning
EGR System Cleaning
High-Pressure Fuel Pump (HPFH) Inspection
And More!

General Service & Fluid Changes
Turbo Replacements
Grid Heater Checks
DPF Regeneration or Cleaning
EGR System Cleaning
And More!

General Service & Fluid Changes
Brakes and Suspension
AC Repair & Diagnosis
Check Engine Light Diagnositcs
Engine/Transmission Replacement
And More!

Located in Limon, Colorado, Tri Valley Auto and Diesel is your one-stop shop for both diesel truck service and complete auto repair. We specialize in Cummins, Power Stroke, and Duramax diesel trucks, and we handle all makes and models of gas-powered cars and trucks with the same level of care.
As a locally owned and operated shop, we treat every vehicle like it's our own. From routine maintenance to major engine work, our ASE-certified techs give you an honest diagnosis, a straight answer on cost, and repairs backed by a 3-year/36,000-mile warranty.
(719) 771-3432