Your Peterbilt Deserves More Than Just Another Repair Shop
You know the feeling the second that dash light flickers on somewhere between a job site and a delivery. Your Peterbilt 379, 389, 567, or 579 is the backbone of your operation, and every hour it sits idle is money leaking out of your pocket. Your crew is standing around waiting on you. A client is watching the clock. And you’ve already been burned by shops that quoted you dealership prices, kept the truck for a week, and still didn’t fix the real problem.
Note: Large vehicles like this are serviced at our Greeley and Fort Morgan locations. Our Brighton shop handles cars and light trucks.
At Bullet Automotive & Diesel, with locations in Greeley and Fort Morgan, CO, we get it because we live in the same world you do. Our ASE Certified Technicians work on real working Peterbilts every day, and we shoot straight with you about what needs fixing now, what can wait, and what’s just fine. No fluff. No mystery line items. Just an honest diagnosis and a truck back on the road as fast as we can get it there.
Why Peterbilt Owners in Greeley and Fort Morgan Choose Bullet Automotive & Diesel
We Speak Your Language, Not Mechanic Jargon
You know your way around an engine. You don’t need to be talked down to, and you definitely don’t need a diagnosis dressed up in shop-talk designed to confuse you into signing off on more work. When we find something on your Peterbilt, we show you and explain it in plain English.
- A clear explanation of what’s wrong and why
- Photos or a walk-around when the problem is visible
- Priority tiers so you know what’s a safety must-fix versus what can wait
- Straight answers to your questions, not runaround
- Updates while your truck is in the bay so you’re never left guessing
That transparency is why fleet owners and owner-operators across Adams County keep coming back. When you’re deciding whether a repair fits this week’s budget, you deserve real information — not a sales pitch.
Peterbilt Expertise Without Dealership Pricing
Peterbilt trucks running PACCAR MX, Cummins, or Caterpillar power are complex machines, and diagnosing them right takes real diesel experience and the right diagnostic tools. Our shop invests in that equipment and that training so you get accurate work without the dealership markup or the days-long wait.
- True Diesel Experience on heavy-duty and medium-duty rigs
- Advanced diagnostic equipment for modern emissions and engine systems
- Fleet Maintenance Repair Specialists who understand uptime pressure
- Quality parts sourced for durability, not just the cheapest option
- Backed by our 12 month or 12,000 Mile Warranty
You shouldn’t have to choose between expert work and a fair price. We give you both, and we stand behind every repair we make.
Transparency That Rebuilds Trust
If a shop has ever tacked ten items onto a repair you brought in for one, you know how fast trust erodes. We do the opposite. Every recommendation comes with a written estimate, and we never touch anything you haven’t approved.
- Written estimates before any work begins
- No surprise line items on your final bill
- Comprehensive Multi-Point Vehicle Inspections so nothing gets missed or invented
- Honest guidance on what can safely wait
- Over 800 5-Star Reviews from drivers who’ve been where you are
Our tagline is We Always Shoot Straight, and that isn’t marketing. It’s how we’ve built a shop people trust with their livelihood.
Comprehensive Peterbilt Repair Services in Greeley and Fort Morgan
Peterbilt Maintenance Services
Consistent maintenance is the cheapest insurance you can buy against roadside breakdowns. Colorado’s brutal temperature swings — below freezing in winter, over 105 degrees in summer — put real stress on a working truck, and a proactive schedule keeps yours dependable.
- Diesel oil and filter changes
- Fuel and air filter replacement
- Coolant system flushes and inspections
- Belt and hose inspection and replacement
- Greasing and chassis lubrication
- Multi-point inspections and DOT readiness checks
Our scheduled maintenance services keep your Peterbilt running on a rhythm you can plan around instead of reacting to.
Peterbilt Diagnostic and Repair Services
When something’s wrong, an accurate diagnosis is everything. A misdiagnosed problem means you pay twice and lose the truck twice. Our technicians use advanced diagnostic equipment to pinpoint the real issue the first time.
- Engine repair and overhaul on PACCAR, Cummins, and Cat power
- Check engine and dash light diagnostics
- Fuel system and injector service
- Turbocharger repair and replacement
- Cooling system and radiator repair
- Electrical system troubleshooting
From vehicle diagnosis and repair to full diesel repair services, we handle the systems that keep your Peterbilt pulling loads.
Peterbilt Specialty Services
Heavy-duty trucks demand more than general repair. These specialty services address the systems unique to hard-working Peterbilts.
- DPF cleaning and diesel emissions repair
- EGR valve service and aftertreatment diagnostics
- Air brake and hydraulic brake repair
- Heavy-duty transmission and drivetrain repair
- Fleet maintenance programs for multi-truck operations
Whether you run one truck or a small fleet, our Fleet Maintenance Repair Specialists build service plans that keep your rigs earning instead of sitting.
Model-Specific Peterbilt Expertise
Peterbilt 579 Service and Repair
The 579 is Peterbilt’s flagship on-highway tractor, often running the PACCAR MX-13 engine. Common concerns include aftertreatment and DPF regeneration faults, wiring harness issues, and sensor failures that trip the dash. We diagnose the emissions and electronic systems accurately so you’re not chasing phantom codes, and we get the truck cleared and back on the interstate.
Peterbilt 567 Service and Repair
Built for vocational and heavy-haul work, the 567 takes a beating on job sites across Adams and Weld counties. Front axle and suspension wear, cooling system strain, and drivetrain stress are typical for this workhorse. We handle suspension, cooling, and driveline repair to keep it hauling under load.
Peterbilt 389 Service and Repair
A classic long-nose favorite among owner-operators, the 389 pairs traditional styling with heavy-duty capability. Owners often see turbocharger issues, fuel system wear, and electrical gremlins as miles pile up. We service the engine, fuel, and electrical systems so your 389 keeps its reputation as a truck that just runs.
Peterbilt 379 Service and Repair
The legendary 379 is still on the road for good reason, but older platforms need attention to keep going. Cooling system aging, injector wear, and brake and suspension fatigue are common. We give this iconic truck the careful diagnosis and quality parts it deserves.
Peterbilt 337 and 348 Service and Repair
These medium-duty Peterbilts serve delivery, utility, and vocational fleets throughout the Denver-Metro corridor. They see stop-and-go stress, brake wear, and cooling demands from constant loading and unloading. We keep these trucks on tight service intervals so your fleet stays predictable and profitable.
Common Issues Across Peterbilt Models
Peterbilt builds tough trucks, but every hard-working diesel develops predictable wear points. Here are the issues we see most often and how we address them.
- DPF and aftertreatment faults: Clogged diesel particulate filters and failed regens are the top cause of derates. We clean, diagnose, and repair the aftertreatment system to restore full power.
- EGR valve failures: Carbon buildup and stuck EGR valves cause rough running and codes. We clean or replace the valve and verify the fix before you leave.
- Turbocharger wear: Loss of power and excess smoke often trace back to a tired turbo. We test, repair, or replace the unit to get your boost back.
- Cooling system strain: Colorado heat and heavy loads push cooling systems hard. We inspect radiators, water pumps, and coolant to prevent overheating on the highway.
- Fuel injector problems: Worn or clogged injectors hurt fuel economy and cause rough idle. We test and service the fuel system to keep combustion clean.
- Electrical and sensor faults: Modern Peterbilts rely on dozens of sensors, and a single bad one can strand a truck. We trace the real fault instead of throwing parts at it.
The Bullet Automotive & Diesel Difference for Peterbilt Owners
You need a shop you never have to second-guess — for your truck and your whole fleet. That’s exactly what we set out to be.
- Respects your time with efficient diagnosis and fast turnaround
- Respects your wallet with written estimates and no surprise upsells
- Respects your knowledge by explaining every repair in plain English
- Respects your livelihood with work backed by our 12 month or 12,000 Mile Warranty
When you find a shop that shoots straight every single time, that low hum of anxiety whenever the truck makes a weird noise finally quiets down. That’s the relationship we build with Peterbilt owners across the region.
Service Areas We Serve
Peterbilt owners and fleet managers throughout northern Colorado count on us for honest, dependable diesel repair.
- Greeley and Fort Morgan — our home shop in Greeley and Fort Morgan
- Greeley — full diesel and fleet service in Weld County
- Fort Morgan — heavy-duty repair for the eastern plains
- Fort Lupton — convenient service along the Highway 85 corridor
- Commerce City — trusted by local vocational fleets
- Thornton — Peterbilt repair close to the Denver-Metro area
Schedule Your Peterbilt Service Today in Greeley and Fort Morgan, CO
Your Peterbilt is too important to gamble on a shop you haven’t vetted. Bring it to a team that speaks diesel, shoots straight, and gets you back on the road fast. Give us a call and we’ll tell you exactly what we see — no runaround, no mystery bills.
Bullet Automotive & Diesel
Greeley: 624 13th St., Greeley, CO 80631 · 970-415-8018
Fort Morgan: 100 Walnut St., Fort Morgan, CO 80701 · 970-867-2519
Read what other drivers say on our reviews page, then call 970-415-8018 to schedule your Peterbilt service. We always shoot straight.