Diesel, Fleet, Class 8.
From Your Phone.
J1939-class diagnostics built into Trackara Pro. Manufacturer modules for Detroit Diesel, Caterpillar, Volvo/Mack, Paccar, and Navistar. Pull codes, read live data, and hand the fleet manager a real report — without lugging a $5,000 dealer tool to a customer's yard.
14-day free trial. Card not charged until day 15.
Heavy-Duty Diagnostics
Your OBD2 Tool Just Says "ERROR"
Consumer-grade scan tools don't speak J1939. You plug into a class-7 dump truck and get nothing. The fleet manager pays you to drive away.
Wrong Protocol, No Data
9-pin Deutsch port, J1939 backbone — your $200 OBD2 dongle isn't going to talk to it. You stand around the yard while the truck downs another driver's day.
$5K to Get In the Door
Dealer-grade tools cost as much as a used car, plus annual subscriptions. You can't justify the cost on five class-8 jobs a month — but those five jobs are some of the best margin you have.
No Report = No Authorization
Fleet managers want documentation before they authorize repairs on a truck that costs them $1,200 a day downed. "I scanned it and it's a turbo" doesn't cut it. They need codes, freeze frames, and a real report.
Class-8 Diagnostics Built Into the App You Already Use
Same Trackara Pro app you run for sedans and pickups. Add a J1939 adapter and the heavy-duty side wakes up.
J1939 Generic + Manufacturer Modules
A generic J1939 path covers the universal codes. Dedicated manufacturer modules add deeper coverage for Detroit Diesel, Caterpillar, Volvo/Mack, Paccar (Kenworth/Peterbilt), and Navistar.
Active + Historical Faults
SPN/FMI fault codes pulled from every ECM the truck has — engine, aftertreatment, transmission, brakes. Active vs. historical separated so you know what's live and what's already been addressed.
OBDLink & BlueFire Compatible
Pair your J1939-capable Bluetooth adapter — OBDLink and BlueFire are tested. Plug into the truck's diagnostic port, pair like any other Bluetooth device, you're scanning.
Live Data Streams
RPM, coolant temp, oil pressure, boost, DPF differential, NOx sensor inputs — read live values to verify a sensor is actually faulty before you bill the customer for parts.
Professional Reports
Generate a branded report with fault codes, freeze-frame data, and your notes. Email it to the fleet manager. Get authorization before you order a $1,200 turbo.
Linked to the Job
Every diagnostic session attaches to the truck's project — codes, data, notes, report. Pull up last month's session at next month's no-start to compare. The fleet's whole history in one app.
Yard Call to Authorized Repair in 22 Minutes
Truck won't pass a regen. Driver is mad. Fleet manager wants a number before 3pm. Here's how that goes with Trackara Pro on a class-8.
Cummins X15 · Allison 4500 · 412,810 mi
DPF differential pressure high
Active. Aftertreatment system requires service.
SCR conversion efficiency low
Active. NOx outlet sensor reading 220 ppm at idle.
DEF tank level
32% — within range, not the cause.
Oil pressure (live)
52 PSI at idle, 64 PSI at 1500 RPM. Healthy.
Coolant temp (live)
187°F. Stable. Not overheating.
Class-8 Margins, Without Class-8 Capital
Heavy-Duty Diagnostics Plug Into Your Whole Pipeline
OBD2 Diagnostics
Same app handles consumer OBD2. Switch protocols based on the vehicle.
Learn moreWork Orders
Diagnostic findings document the Three C's automatically — Concern, Cause, Correction.
Learn moreQuotes & Estimates
Roll a J1939 finding straight into a quote with parts and heavy-duty labor rates.
Learn moreClient Management
A fleet account with 30 trucks gets one record — every diagnostic on every unit, in one place.
Learn moreHeavy-Duty FAQ
Answers for fleet & diesel mechanics
What engines and manufacturers are supported?
Trackara Pro's heavy-duty module includes J1939-class diagnostics with manufacturer modules for Detroit Diesel, Caterpillar, Volvo/Mack, Paccar (Kenworth/Peterbilt), and Navistar — plus Cummins via the generic J1939 path. Engines covered range from medium-duty trucks up through class-8 over-the-road tractors.
What adapter do I need?
A J1939-capable Bluetooth adapter — OBDLink and BlueFire are tested. Plug into the truck's 9-pin (or 6-pin) diagnostic port and pair with your phone like any other Bluetooth device. The app walks you through device pairing.
Will this replace my $5,000 dealer-grade scan tool?
For most code-pull, live-data, and customer-facing diagnostic work — yes. For OEM-locked bidirectional functions (DPF regen forces, ECU reflashes), you'll still need an OEM tool. Trackara Pro covers the 90% of work that pays the bills.
Can I generate a customer report from a heavy-duty session?
Yes. Active and historical fault codes, freeze-frame data, and your notes export as a professional report — branded with your shop info — that you can hand the fleet manager or attach to an invoice.
Stop Walking Away From Class-8 Calls.
J1939 in your pocket. Manufacturer modules built in. Real reports the fleet manager can authorize against. Without the $5K tool.