AI-Powered Vehicle Diagnostics

One App.
Every Vehicle.
Real Answers,
Right Now.

From passenger cars to Class 8 semis and heavy equipment — DiagIQ delivers AI-powered diagnostics for every vehicle you own or service.

Start diagnosing free See how it works
No OBD hardware required to get started Covers 40,000+ vehicles Plain-English fault explanations
Mechanic in uniform inspecting truck engine for maintenance indoors.
LIVE — DiagIQ
P0420
ENGINE RPM 2,840 rpm
COOLANT TEMP 198°F normal
FAULT CODE P0420
DIAGNOSIS CAT efficiency low
AI says: Catalyst below threshold. Check O2 sensor first — saves avg. $340 vs. dealer.

By the numbers

40K+ Vehicles covered
$340 Avg. saved per repair
4 Vehicle classes — one app
2 min From scan to AI diagnosis
Professional-grade. Consumer-priced.

Platform capabilities

Every diagnostic a professional needs. None of the hardware costs.

01 — AI Intelligence

Fault codes decoded in plain English — with repair cost estimates

DiagIQ reads every OBD-II, J1939, and J1708 fault code and translates the raw hex into clear, actionable guidance. Know if it's safe to drive, what part likely failed, and whether your shop is quoting you fairly — before you hand over the keys.

  • Real-time severity rating — critical, moderate, or informational
  • Repair cost benchmarks from 2M+ real shop invoices
  • Step-by-step guided diagnosis for 600+ common failure modes
Close-up of a Volkswagen car engine undergoing repair in a garage, tools and diagnostic equipment in use.
Smiling auto mechanic uses digital tablet in car repair shop environment.

02 — Fleet Management

Manage every vehicle in your fleet from a single dashboard

Independent mechanics and fleet operators track every vehicle, every fault, every repair history in one place. No more sticky notes, paper logs, or $3,000 OEM scan tools that only cover one brand.

  • Unlimited vehicles per account — no per-VIN fees
  • Full diagnostic history with timestamped scans
  • Push alerts when a vehicle throws a new fault code

03 — Heavy Duty

Class 8 semis. Heavy equipment. No other app goes this deep.

DiagIQ supports J1939 and J1708 protocols used in commercial trucks, excavators, loaders, and agricultural machinery — the vehicles that previously required $5,000–$8,000 OEM diagnostic hardware.

J1939 Heavy truck protocol
J1708 Legacy commercial
OBD-II Passenger & light truck
ISO 27145 Euro heavy equipment
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Vehicle coverage

Every class. Every protocol.
One subscription.

DiagIQ is the only diagnostic platform that spans passenger cars through Class 8 heavy trucks and off-road equipment without switching tools.

Passenger Cars

OBD-II coverage for all makes — Ford, GM, Toyota, BMW, Honda, and 200+ more.

OBD-II

Light Trucks & SUVs

F-150, RAM 1500, Silverado, Tacoma — full live data and advanced TPMS, ABS, ADAS.

OBD-II

Class 8 Semi Trucks

Peterbilt, Kenworth, Freightliner, Volvo — engine, transmission, brakes, ELD data.

J1939

Medium-Duty Trucks

Classes 3–7 — box trucks, delivery vans, utility vehicles, fire apparatus.

J1939 / OBD-II

Heavy Equipment

Caterpillar, John Deere, Komatsu, Volvo CE — excavators, graders, loaders.

J1708 / ISO

Agricultural

Tractors, combines, sprayers — Case IH, John Deere, AGCO, New Holland.

ISO 11783

← Scroll to see all vehicle classes →

Why DiagIQ

More coverage. Less cost.
No compromises.

Capability DiagIQ from $9.99/mo FIXD / BlueDriver $60–$100 hardware Dealer / OEM Tool $150+ visit / $5K+ hardware
Passenger car OBD-II diagnostics
Class 8 semi truck (J1939) OEM only
Heavy equipment (J1708 / ISO)
AI plain-English fault explanations Basic only
Repair cost benchmarking Partial
Multi-vehicle fleet dashboard
Cost to get started $9.99 / month $60–$100 hardware $150+ per visit

Trusted by professionals

What mechanics and owner-operators say

"I run a 12-truck fleet of Kenworths and Peterbilts. Before DiagIQ, every fault code meant a $400 diagnostic visit to the dealer. Now my drivers scan themselves and I get an alert on my phone within seconds — with an actual repair estimate. It paid for a year of subscriptions in the first week."

Marcus T. — Owner-operator, MT Freight, Tulsa OK — Class 8 Fleet

"I compared DiagIQ to my Snap-on scanner on 40 different vehicles. DiagIQ missed nothing. It found two issues Snap-on flagged with no explanation and actually told me what to do about them."

Derek P. — ASE Master Tech, 14 yrs

"My F-350 threw a P0401 and the dealer quoted me $780. DiagIQ said clean the EGR valve first — $0 in parts. Cleared it. Never came back. The AI guided me through the whole thing step by step."

Jenna R. — F-350 owner, rural Montana

"We run 6 Caterpillar 320 excavators on a highway job. DiagIQ is the only app that actually reads Cat SPN codes without the $6,000 Cat ET software. Game changer for independent operators."

Bryan K. — Site supervisor, KW Construction

"I used to spend 20 minutes explaining fault codes to customers. Now I hand them the DiagIQ report and they understand immediately. It makes the whole shop more trusted and efficient."

Sandra M. — Service writer, Mesa Auto Group

Pricing

Professional diagnostics at a fraction of the cost

No hardware fees. No per-scan charges. Cancel any time.

Driver

For individual vehicle owners

$9.99 /month
  • Up to 3 vehicles
  • OBD-II (passenger & light trucks)
  • AI fault explanations
  • Repair cost estimates
  • Heavy truck / equipment protocols
  • Fleet dashboard
Start free trial

Pro

For mechanics and small fleets

$29.99 /month
  • Unlimited vehicles
  • OBD-II + J1939 (Class 8 trucks)
  • Full AI repair intelligence
  • Fleet dashboard + push alerts
  • Full diagnostic history
  • Heavy equipment protocols
Start my free trial

14-day free trial. No credit card required.

Fleet

For large fleets and equipment operators

$79.99 /month
  • Everything in Pro
  • J1708 + ISO 27145 (heavy equipment)
  • Team accounts (up to 10 users)
  • API access + data export (CSV, PDF)
  • Priority support + onboarding call
  • Custom reporting dashboards
Contact sales
30-day money-back guarantee Bank-level data encryption Cancel any time — no contracts

Stop guessing.
Start diagnosing.

Every vehicle you own. Every fault code explained. Real repair guidance from the moment you scan — not after a $150 dealer visit.

Start my free trial Explore the platform first

14-day free trial · No credit card required · Cancel any time

SOC 2 compliant 40,000+ vehicles supported 2-minute setup