Truck Repair Guide
Got a truck problem? This guide shows you how to diagnose and repair your diesel truck step-by-step. No guessing. No confusing manuals. Just clear instructions built by an ASE Certified Diesel Technician.
Stop Guessing. Start Fixing.
Most truck problems come from a single fault code. Instead of paying shop labor rates, you can diagnose the issue yourself. Our tool gives you the exact test sequence to run next, so you know what's wrong before you replace parts. Browse common truck problems to identify your issue, or use the repair cost estimator to understand what a fix should cost before you authorize any work.
- Works for diesel pickups and semis
- Covers SPN/FMI, OBD-II, and OEM dash codes
- Step-by-step repair instructions
- Plans from $12.95/mo — save hundreds in shop labor
- Save hundreds in shop labor
Want to sharpen your diagnostic skills? The technician training guide covers SPN/FMI fundamentals, OBD-II basics, and how to follow a diagnostic flow without guessing. The technician training guide
Common Truck Repair Issues
We help diagnose and fix the most common diesel problems technicians and owners face every day.
Enter your fault code to see the exact repair steps.
Start DiagnosisHow To Fix Your Truck With AI Diesel Tech
- 1
Enter your fault code
SPN/FMI, OBD-II, or dash code — we handle all three.
- 2
Follow step-by-step test instructions
The AI walks you through each test in the right order.
- 3
Upload photos if needed
Scanner screenshots or wiring diagrams help narrow the root cause fast.
- 4
Get the repair plan
Exact parts, torque specs, and labor steps — no guessing.
- 5
Download your repair summary
Save a full record of the diagnosis and fix for your records.
Supported Diesel Engines
Coverage for the most common commercial and pickup diesel platforms.
Save Hundreds In Shop Labor
Truck repair shops charge $150–$200 per hour. With AI Diesel Tech, you can diagnose the problem yourself for just $12.95/mo. Most users fix their truck in under 30 minutes.
$150–$300
per visit
Avg shop diagnostic fee
$12.95
per month
AI Diesel Tech subscription
< 30 min
with AI guidance
Avg time to diagnosis
Ready To Fix Your Truck?
Start your diagnosis. Step-by-step repair path from your fault code.