Diesel, Fleet, Class 8.
From Your Phone.
Coming soon. J1939-class diagnostics are on the Trackara Pro roadmap, with planned manufacturer modules for Detroit Diesel, Caterpillar, Volvo/Mack, Paccar, and Navistar. The goal: 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. Standard OBD2 diagnostics are already live today; everything below is what we're building toward for heavy-duty.
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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
Is Heavy-Duty Diagnostics available yet?
Not yet, Heavy-Duty Diagnostics is coming soon and on our roadmap. Standard OBD2 diagnostics are already live in the app today; the J1939-class heavy-duty extension for diesel, fleet, and class-8 work is what we're building. Everything described here reflects what's planned when it launches.
What engines and manufacturers will be supported?
When Heavy-Duty Diagnostics launches, the module is planned to include J1939-class diagnostics with manufacturer modules for Detroit Diesel, Caterpillar, Volvo/Mack, Paccar (Kenworth/Peterbilt), and Navistar, plus Cummins via the generic J1939 path. Coverage is intended to range from medium-duty trucks up through class-8 over-the-road tractors.
What adapter will I need?
A J1939-capable Bluetooth adapter, OBDLink and BlueFire are the ones we're targeting. When it launches, you'll plug into the truck's 9-pin (or 6-pin) diagnostic port and pair with your phone like any other Bluetooth device, and the app will walk you through device pairing.
Will this replace my $5,000 dealer-grade scan tool?
That's the goal when Heavy-Duty Diagnostics launches, for most code-pull, live-data, and customer-facing diagnostic work. For OEM-locked bidirectional functions (DPF regen forces, ECU reflashes), you'll still need an OEM tool. The plan is to cover the 90% of work that pays the bills. It's coming soon.
Will I be able to generate a customer report from a heavy-duty session?
That's the plan. When it launches, active and historical fault codes, freeze-frame data, and your notes are intended to export as a professional report, branded with your shop info, that you can hand the fleet manager or attach to an invoice.
Get Ready to Stop Walking Away From Class-8 Calls.
Heavy-Duty Diagnostics is coming soon: J1939 in your pocket, manufacturer modules, and real reports the fleet manager can authorize against, without the $5K tool. Start with Trackara Pro today for invoicing, work orders, and live OBD2 diagnostics, and you'll have it the moment it launches.