Diagnostics & Electrical Repair // South Dakota
A check engine light or no-start can have dozens of root causes. We use dealer-level scan tools to pull live data, isolate the failure, and fix the actual problem - not guess at parts.
Symptoms We See
- ▸Check engine light or amber warning
- ▸Truck won't start or cranks slow
- ▸Intermittent electrical gremlins
- ▸Failed regen or DEF system faults
- ▸Lights, gauges, or sensors acting up
What's Included
- ✓Full scan-tool diagnostic session
- ✓Wiring harness testing and repair
- ✓Sensor replacement
- ✓Starter, alternator, battery service
- ✓ECM and module programming
Why It Matters
Throwing parts at a fault code is expensive and rarely fixes the problem. Accurate diagnostics save days of downtime and hundreds - sometimes thousands - in unnecessary parts.
Why Choose 1776
Dealer-Level Diagnostics
Real scan tools for every major heavy-duty platform - not generic readers.
Experienced Techs
Heavy-duty diesel specialists who've seen it before and know how to fix it right.
Honest Communication
Clear estimates, no upsells, and a call before any scope change.
Fast Turnaround
Six bays and parts relationships that keep your truck moving, not parked.
Frequently Asked Questions
What does a diagnostic appointment cost?+
A standard diagnostic session is billed at our shop rate, typically one hour. We credit the time toward the repair if you book the fix with us.
Can you read codes from any truck?+
Yes - we cover all major heavy-duty platforms and most light-duty diesels with dealer-level tools.
My check engine light is on but the truck runs fine. Do I still need diagnostics?+
Yes. Many emissions and injector codes start as a warning long before the truck derates or shuts down on the road.
Related Services
General Diesel Repair
Full-service diesel repair for trucks, trailers, and heavy equipment.
Learn More →Engine Repair, Rebuild & Overhaul
In-frame and out-of-frame overhauls for Cat, Cummins, Paccar, Detroit.
Learn More →Preventive Maintenance
Scheduled PM service that keeps trucks out of the breakdown lane.
Learn More →Truck Down? Call Now.
Give us your fault codes or symptoms. You get a straight answer in plain language.