Heavy Duty Diagnostics, Engineered End-to-EndFrom Protocol Stack to AI Insight — Built by Diesel Engineers, Not Chatbots
VCI hardware. Cloud AI. 68 commercial brands. 38 months of frontline data. Trusted by fleets, dealers and OEM whitelabel partners across three continents.
Real-World Diagnostic Cases
Kenworth T680 DPF Regen Failure
Intermittent active regen abort at 68%. Root cause: cracked DOC inlet temp sensor wiring harness — not the DPF itself. Saved $4,200 in unnecessary parts.
Freightliner Cascadia Aftertreatment Derate
5 MPH derate with SPN 4364 / FMI 18. DEF quality sensor passed bench test but failed under thermal cycling. Pattern affects 2018-2021 DD15 engines.
Peterbilt 579 Cummins X15 No-Start
Cranks but no start after ECM reflash. Fuel rail pressure stuck at 2,800 PSI. Found corroded ground stud G103 behind cab — common post-reflash miss.
International LT625 Transmission Fault
Stuck in 4th gear, Eaton Fuller automated. J1939 SPN 524 showing erratic output shaft speed. Damaged tone ring teeth from previous driveline work.
Mack Anthem MP8 High Crankcase Pressure
CCV system fault with oil consumption >1 qt per 1,000 mi. Turbo oil seal intact — actual cause was worn valve stem seals on cylinders 3 and 5.
CAT 930K Loader CDL Comm Drop
Intermittent loss of comms over the 9-pin Deutsch CDL bus. Ruled out cable and connector; traced to ECU software 5363669-00 (OCT2017) under mixed J1939 + CDL bus contention.
Hino 268 (500 Series) Speed Limiter Units
Programmed limit value displayed in metric while the vehicle ran imperial — driver confusion across NA fleets. Identified UI/firmware unit mismatch on 2017 NA-spec ECMs.
Cummins ISX15 / CM2350 J1939 Data Stream Loss
Intermittent J1939 PGN dropouts under DPF active regen load. Pattern: ClearFilter not sent before high-rate scan caused buffer collision in third-party gateway.
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About PrimoDeTech
PrimoDeTech (Hong Kong) builds end-to-end diagnostic systems for commercial vehicles — from CAN/CDL VCI hardware to cloud AI. Our engineering team in Shenzhen partners with fleets, independent shops and OEM whitelabel programs across three continents.
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