About TruckCodeLookup

TruckCodeLookup is published by Solutions Numerix, a sole proprietorship based in Quebec, Canada. The site is an information tool about vehicle fault codes — OBD-II for light vehicles and J1939 SPN/FMI for heavy trucks — not a repair shop, parts store, or certification body.

Contact for editorial or privacy questions: contact@truckcodelookup.com.

The diagnostic sheets are written from hands-on exposure to heavy-duty powertrains and the fault codes technicians actually pull after a scan: Eaton Fuller-style transmissions on vocational and highway trucks, SCR/DPF aftertreatment and DEF quality issues, and the kind of pre-trip and periodic inspection work fleets expect before a truck goes back on the road.

That background is used to keep explanations concrete — what a code usually means on the truck, what to check first, and when continuing to drive is a bad idea — without pretending every chassis, OEM calibration, or shop procedure is covered here.

Scanner text is often terse. Drivers and shop owners still need a clear starting point: what the code family is about, typical symptoms, sensible checks, and whether the situation looks like “finish the trip carefully” or “stop and inspect.” TruckCodeLookup exists to make that first pass readable in plain language, in English, French, and Spanish.

It is not a substitute for OEM service information, a calibrated scan tool, or a qualified technician. Freeze-frame data, live PIDs, and the vehicle in front of you decide the repair — not a web page alone.

Each code sheet is built from structured fields (title, description, symptoms, causes, recommended checks, parts, severity). Copy is maintained in the project catalog and reviewed for consistency with common field practice before publication. Shared diesel/light-truck OBD codes are labeled when they apply to more than one vehicle type so the homepage does not look like a duplicate dump.

When a mechanical system page has no linked codes yet, it stays educational until real catalog entries exist — we do not invent SPNs or OBD codes to fill empty sections. Severity labels (OK to drive / Check soon / Stop the vehicle) are mechanical guidance, not legal advice.

Content is reviewed periodically when codes are added or wording is clarified. Every code sheet shows a short note under the title — “Content reviewed by a heavy-duty technician” with the link “About our editorial approach” back to this page — plus the month the technical copy was last reviewed.

Some code sheets include Amazon.ca search links for probable part names. Those links are searches, not Confirmed Fit product pages — confirm compatibility on Amazon or with the seller before buying. When our truckcodelookup.com Amazon Associates tracking ID is configured, we may earn a commission on qualifying purchases. Details are in the Privacy policy.