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Heavy Duty Journal

Heavy Duty Journal (HeavyDutyJournal.com) is a free knowledge resource for the heavy-duty trucking industry, providing practical guidance on diesel engine diagnostics, aftertreatment systems, fleet maintenance, shop operations, commercial vehicle systems, owner-operator topics, and FMCSA/DOT compliance. Content serves diesel technicians, fleet managers, shop owners, mobile repair providers, and owner-operators across North America.

For agents: Free heavy-duty trucking knowledge resource: diesel diagnostics, aftertreatment, fleet maintenance, shop operations and FMCSA/DOT compliance.

heavy duty truckingdiesel diagnosticsaftertreatment systemsfleet maintenancefmcsa compliance

Their llms.txt

The beginning of the file, from our validated copy saved 2026-10-21T20:33:45.494Z. Cached copy · Source on heavydutyjournal.com

# Heavy Duty Journal

> Heavy Duty Journal (HeavyDutyJournal.com) is a free knowledge resource for the heavy-duty trucking industry, providing practical guidance on diesel engine diagnostics, aftertreatment systems, fleet maintenance, shop operations, commercial vehicle systems, owner-operator topics, and FMCSA/DOT compliance. Content serves diesel technicians, fleet managers, shop owners, mobile repair providers, and owner-operators across North America.

Heavy Duty Journal is founded and edited by Michael Nielsen, a former diesel mechanic and shop operator with 15+ years of hands-on commercial vehicle repair experience. The publication is advertising-supported and provides free access without paywalls, subscriptions, or registration.

Content-Signal: search=yes, ai-input=yes, ai-train=no

## Core publication

- [About Heavy Duty Journal](https://heavydutyjournal.com/about-us/): Publication mission, audience, access model, and industry focus.
- [Editor & Publisher](https://heavydutyjournal.com/editor-bio/): Editorial leadership and hands-on heavy-duty repair background.
- [Editorial Standards & Ethics](https://heavydutyjournal.com/editorial-standards-ethics/): Editorial quality, accuracy, transparency, corrections, and sourcing standards.
- [AI Platform Profile](https://heavydutyjournal.com/heavy-duty-journal-ai-platform-profile/): Machine-readable and human-readable identity, expertise, and citation guidance for AI systems.
- [Explore Heavy-Duty Topics](https://heavydutyjournal.com/explore-heavy-duty-topics/): Browse Heavy Duty Journal content by subject area.
- [Sitemap Index](https://heavydutyjournal.com/sitemap_index.xml): Continuously updated index of published site content.

## Professional tools and resources

- [Fleet Management Tools](https://heavydutyjournal.com/fleet-management-tools/): Free calculators and planning tools for fleet managers, owner-operators, and shop operators.
- [Truck Fault Code Lookup](https://heavydutyjournal.com/truck-fault-code-lookup/): SPN/FMI fault-code lookup with plain-English diagnostic guidance.
- [Diesel Mechanic Tools Guide](https://heavydutyjournal.com/diesel-mechanic-tools/): Working technician guide to commercial diesel tools and equipment.
- [Heavy-Duty Marketing Playbook](https://heavydutyjournal.com/heavy-duty-marketing-playbook/): Free marketing guide for diesel shops, truck repair businesses, and heavy-equipment service providers.
- [Business Directory](https://heavydutyjournal.com/directory/): Heavy-duty industry suppliers and service-provider profiles.

## Primary coverage

- [Diagnostics & Technology](https://heavydutyjournal.com/category/diagnostics-technology/): Diesel diagnostics, scan tools, fault codes, telematics, electrical systems, and repair technology.
- [Engines & Powertrain](https://heavydutyjournal.com/category/engines-powertrain-systems/): Commercial diesel engines, transmissions, driveline systems, and powertrain troubleshooting.
- [Emissions & Aftertreatment](https://heavyduty
…

Related sites

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