Engine Diagnostics

 Stop Guessing. Start Diagnosing.

When your semi-truck is down, you’re not making money. That’s why Redneck Diesel Performance takes a direct, no-BS approach to heavy-duty diesel diagnostics.

We diagnose Class 8 trucks, commercial fleet vehicles, and over-the-road rigs using advanced diagnostic software, OEM-level scan tools, ECM fault-code analysis, and real-time engine data. But we don’t just read the code and start replacing parts.

A fault code tells you where to start—not what to throw at the truck.

Our technicians analyze the data, test the related systems, and track down the root cause before recommending a repair. That means less guesswork, fewer unnecessary parts, and a better chance of solving the actual problem.

We diagnose issues involving:

- DPF and aftertreatment systems

- EGR system failures

- SCR and emissions faults

- Turbocharger performance

- Fuel-system problems

- Engine electrical systems

- Sensors, wiring, and ECM communication

- Engine performance and drivability

Bring your truck to RDP if you’re dealing with:

- Check-engine or warning lights

- Engine derates

- Loss of power under load

- Poor fuel economy

- Rough running or hard starting

- Frequent regeneration problems

- Aftertreatment-system failures

- Intermittent electrical faults

Our big-rig diagnostic services are built for owner-operators and fleet managers who need straight answers and dependable repair solutions. We work efficiently, communicate clearly, and focus on minimizing unnecessary downtime.

No parts cannon.

No code-clearing and hoping.

No “let’s see if this fixes it.”

Just accurate testing, real answers, and a repair plan based on what your truck actually needs.

When your rig isn’t running right, bring it to Redneck Diesel Performance.

We’ll find the problem—and help get your truck and your business moving again.