Fast, Accurate Fault Detection for Cummins, CAT, Detroit & More
When your check engine light comes on or your truck isn’t performing right, you need answers — fast. At Road 1 Inc, we specialize in computerized diesel diagnostics using OEM-grade tools that scan your engine’s ECM, identify hidden faults, and get you back on the road with confidence.
We diagnose Class 6–8 diesel trucks, heavy equipment, and fleet vehicles with industry-leading accuracy.
We Work With Your Fleet Maintenance Company
- We know the process from approvals to payment.
- We handle the paperwork so you don't have to.
- We keep your trucks moving with fast repair when and where you need them.
24/7 Emergency Diesel Repair Experts
Trusted by Columbia’s fleet managers and owner-operators for on-site service anytime, anywhere.
Certified Diesel Technicians
Our team combines over 20 years of hands-on experience in diesel engine diagnostics.
Fleet Contracts with DOT Compliance Support
Partnered with local logistics, construction, and agricultural businesses to keep fleets road-ready and regulation-compliant.
Backed by Real Reviews & Repeat Clients
Hundreds of trucks serviced with consistent 5-star testimonials praising our speed, honesty, and technical precision.
Quality Repairs & Service Guaranteed
What We Diagnose
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Check engine light (CEL) faults
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DEF/DPF/emissions system errors
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EGR valve and turbocharger issues
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Poor fuel economy or power loss
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Electrical and sensor failures
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No-start or rough idle conditions
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Aftertreatment and regen failures
Brands and Engines We Specialize In
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Cummins ISX, ISB, X15
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Detroit Diesel DD13, DD15, Series 60
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CAT C15, C13, 3406E
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International, Volvo, Mack, PACCAR
Our Equipment and Capabilities
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OEM-grade software: Cummins INSITE, CAT ET, Detroit DiagnosticLink
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Bi-directional controls and live data streaming
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DPF regeneration and forced commands
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Fault code printout with repair recommendations
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ECM parameter review (idle, cruise, temperature)
Why It Matters
Ignoring engine warnings can lead to:
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Increased fuel consumption
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Component damage (turbo, injectors, DPF)
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Emergency roadside failures
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Failed DOT inspections
Why Choose Road 1 Inc
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Certified diesel technicians
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Same-day diagnostic availability
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In-shop and roadside diagnostic capability
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Fleet pre-trip and preventive testing
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Transparent pricing: $150 base scan with repair credit available
Customer Testimonial
"Road 1 found the issue in 45 minutes after two other shops misdiagnosed it. Saved me $2,000 and got me rolling again." – Owner-Operator, Columbia, SC
Diesel Diagnostics FAQ
How long does a diagnostic take?
Most diagnostics are completed in 30 to 60 minutes. Complex faults may take longer depending on the issue.
Can you perform diagnostics roadside?
Yes. Our mobile service trucks are fully equipped with laptops, regen tools, and OEM software.
Will I get a copy of the fault codes?
Absolutely. We provide a full printout of ECM codes and detailed repair recommendations.
What if I already had a code scan done elsewhere?
Unlike basic scans, we use full dealership-level diagnostic software to pinpoint and verify root causes, not just read fault codes.
Schedule a Diesel Diagnostic Today
Call (803) 794‑5155 now or [Book Your Diagnostic Online]
Get clear answers and expert repairs from Columbia’s diesel engine specialists.