Your Fleet’s Watchtower:

Always On, Always Watching.

AI and human expertise working 24/7 to watch over your fleet, predict issues, and hand you the repair plan.

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Every mile your fleet runs, WatchTower is working behind the scenes. As buses operate, streams of data flow instantly to the cloud where our predictive AI and expert diesel technicians review them in real time. Our AI doesn’t just monitor data. It predicts potential issues before they become breakdowns.

We cut through the noise, focus on what matters, and deliver clear repair plans so you know exactly when to act and how to fix it. The result: less downtime, fewer breakdowns, and a fleet that runs smarter every single day.

The Cost of Guesswork is Breaking Fleets

Modern buses generate thousands of data points and constant fault codes, but most of them lack context. Fleet managers are left guessing which issues matter, which can wait, and when to pull a vehicle from service. The result? Wasted labor, unnecessary parts replacement, surprise breakdowns, and vehicles sidelined longer than they should be

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From Data to Decisions in Four Steps.

WatchTower combines predictive AI with experienced diesel technicians to monitor every system on your fleet, 24/7. Here’s how we turn streams of raw data into clear, actionable repair plans.

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  • Data Ingestion – Every mile, every system, thousands of data points from your bus is flowed instantly to the cloud.
  • AI Filters & Predicts - Predictive AI analyzes thousands of data points, spotting both current issues and potential failures before they happen.
  • Expert Tech Review - Certified diesel technicians validate the AI’s findings, decide what matters, and ignore the noise.
  • Actionable Repair Plan - Fleet managers receive clear guidance: urgency level, diagnostic steps, and often part numbers. Everything needed to fix it right the first time.

Choose the Right Tool for Your Mobile Business

From quick code reads to full dealer-level coverage, Diesel Laptops has a solution for every mobile technician.

Diesel Tablet
Truck Only

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  • Performs all dealer-level diagnostics commands
  • Program injectors, VGT actuators, & other components
  • 100% coverage of commercial trucks
  • Ideal for mobile techs focused on highway trucks

Diesel Handheld Pro
Truck Only

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  • Affordable, portable, and easy to use
  • Read & clear fault codes and access live data
  • Perform common resets and regens
  • Perfect tool for roadside triage

Combo Kit
Truck & Off-Highway

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  • Covers on-highway trucks and off-highway equipment
  • Only aftermarket kits with OHW repair information
  • Rugged laptop pre-loaded with software & cables
  • Includes Diesel Repair, tech support, and training
 Handheld ProDiesel TabletCombo Kit
PortabilityHigh (Rugged Handheld) Medium (Larger Tablet) Low (Laptop)
Best Fit For Roadside Triage / Start Ups Truck Only Mobile Business Truck & OHW Mobile Business
Device Dependency StandaloneStandaloneLaptop + VCI
CoverageCommercial Trucks Commercial TrucksCommercial Truck & Off-Highway
Read/Clear Codes (Trucks) YesYesYes
Read/Clear Codes (OHW) NoNoYes
DPF Regens Commercial Trucks Commercial Trucks Commercial Truck & Off-Highway
Aftertreatment Resets (Filters, Derates, Etc.) Commercial Trucks Commercial Trucks Commercial Truck & Off-Highway
Change Speeds (Road & Cruise) NoYesYes
All Other OEM Diagnostic Commands NoYesYes
ECM Password Support NoYesYes
Maintenance Resets (Oil Change, Air Filter, Etc.) YesYesYes
Repair Information (Diesel Repair) Not Included Not Included Professional Level
Tech Support - IT YesYesYes
Tech Support – Diesel Techs NoNoYes
Online Training Not IncludedNot IncludedUp to 5 Techs
Classroom Training Not IncludedNot IncludedUp to 5 Techs
Software Updates Free 1st Year Free 1st Year Free 1st Year
Pricing Model Lifetime Full Functionality / Annual for Updates Lifetime Full Functionality / Annual for Updates Lifetime Full Functionality / Annual for Updates

More Than Just a Tool. A Partner in Every Repair.

The right kit gives you more than diagnostics. It gives you the knowledge and backup to handle any job.

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Expert Tech Support

Available 6 days a week, our experts handle over 80,000 cases a year. Staffed with 30+ ASE & OEM certified diesel technicians from every industry imaginable.

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Diesel Repair Access

The most complete parts & repair data base on the planet. Repair information for every fault code, labor time guides, wiring diagrams, & much more. Available via web, iOS, or Android apps.

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Diesel Training

Online and classrooms throughout the United States. Keep your skills on electric, emissions, CAN bus, and everything else.

These services are included with the Combo Kit. Handheld Pro and Diesel Tablet customers may purchase them separately

Nathan Clark, Gearhead Services

“From skidsteers to farm equipment, with Diesel Laptops I can connect to everything. Engine, body controllers, joysticks, calibrations.”

Jeff Sigmon, Mobile Diesel Diagnostics

“My relationship with Diesel Laptops is not only a business relationship, but a personal one too. With Diesel Laptops I can talk to real people who know what they are doing”

Ready to Take Your Mobile Repair Business Further?

From quick code readers to full dealer-level coverage, Diesel Laptops has the right solution to keep you working smarter, faster, and with confidence.








Common Questions

Does the kit include everything I need to start using it right away?

Yes. Each kit comes pre-loaded on a rugged laptop or tablet with all required cables and adapters. You’ll be able to plug in and start diagnosing on day one.

Are Diesel Repair, Tech Support, and Training included?

They’re included in the Combo Kit. Handheld Pro and Diesel Tablet customers can purchase these subscriptions separately if needed.

What are your support hours?

Our call center hours are posted on our Support Page. Diesel Repair and the online diesel technician training is 24/7.

Can I use these tools for off-highway equipment?

Only the Combo Kit covers both truck and off-highway equipment. The Handheld Pro and Diesel Tablet are for on-highway trucks only.

Do you sell emissions deletes or tuning?

No. We only provide emissions-compliant tools and information. Our focus is helping you diagnose and repair trucks the right way.

How does technical support work?

You’ll have unlimited access to our call center, staffed with over 30 experienced diesel technicians. They can remotely assist with troubleshooting, walk you through diagnostics, and provide repair advice based on OEM-level experience. We also have over 30 IT professionals to assist with software updates and fixes.

Can I add other tools?

Yes, you can purchase any other tools at Diesel Laptops via our website or by calling us. They won’t be rolled into the monthly price so you’ll have to purchase them separately.