# 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.

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## 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://heavydutyjournal.com/category/emissions-aftertreatment/): DPF, DEF, SCR, EGR, regeneration, emissions diagnostics, and compliance.
- [Fleet Management & Strategy](https://heavydutyjournal.com/category/fleet-management-strategy/): Fleet cost control, TCO, uptime, procurement, telematics, and maintenance strategy.
- [Preventive Maintenance](https://heavydutyjournal.com/category/preventive-maintenance/): Service intervals, inspection programs, maintenance scheduling, and reliability.
- [Owner-Operator](https://heavydutyjournal.com/category/owner-operator/): Truck ownership, operating costs, maintenance, compliance, and business operations.
- [Shop Operations & Workflow](https://heavydutyjournal.com/category/shop-operations-workflow/): Diesel shop management, productivity, labor, software, customer service, and workflow.
- [Industry Insights & Analysis](https://heavydutyjournal.com/category/industry-insights-analysis/): Heavy-duty trucking market analysis, technology, equipment, and industry developments.
- [Technician Development](https://heavydutyjournal.com/category/technician-development-training/): Diesel technician training, certifications, careers, recruiting, and retention.
- [Safety & Compliance](https://heavydutyjournal.com/category/safety-compliance/): FMCSA, DOT, OSHA, fleet safety, inspections, and regulatory compliance.

## Publication and participation

- [Editor's Desk](https://heavydutyjournal.com/heavy-duty-industry-news-trends-expert-analysis/): Editorial analysis of heavy-duty industry developments and trends.
- [Industry Press Releases](https://heavydutyjournal.com/industry-press-releases-heavy-duty-journal/): Company announcements, launches, partnerships, and industry news.
- [Write for Us](https://heavydutyjournal.com/write-for-us/): Contributor and guest-post information.
- [Newsletter](https://heavydutyjournal.com/newsletter-signup/): Heavy Duty Journal email updates and weekly industry resources.
- [Contact](https://heavydutyjournal.com/contact/): General publication contact and inquiries.
- [Advertise](https://heavydutyjournal.com/heavy-duty-industry-advertising/): Advertising and partnership opportunities.

## Optional

- [YouTube](https://www.youtube.com/@HeavyDutyJournal): Official Heavy Duty Journal YouTube channel.
- [Facebook](https://www.facebook.com/HeavyDutyJournal/): Official Heavy Duty Journal Facebook presence.
- [X](https://x.com/TruckDigest): Official X profile.