BIGRIGFAULTS COMMUNITY

Truck problems. Real-world answers.

Talk with drivers, mechanics, owners and technicians. Compare symptoms, share fixes and jump straight into BigRigFaults diagnostic data.

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ResourcesGuides, checklists and technical downloads.

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Truck Diagnostics

General Truck Diagnostics

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Fault Codes / SPN / FMI

Discuss SPN, FMI, DTC and manufacturer fault codes.
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Before Replacing a Sensor: 7 Diagnostic Checks
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No Start / Hard Start

Crank-no-start, extended cranking and difficult starting problems.
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Truck Cranks But Will Not Start: First Checks
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Derate / Limp Mode

Engine derates, speed restrictions and limp-mode troubleshooting.
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Truck in Derate or Limp Mode: What to Record Before Repair
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Warning Lights

Check engine, stop engine and other dashboard warning lights.
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Check Engine vs Stop Engine Light: Basic Difference
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Intermittent Problems

Faults that appear and disappear or are difficult to reproduce.
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Engines & Truck Brands Brand and engine-specific diagnostics, repair information and owner experience.

Cummins

Cummins X15, ISX, ISB, L9 and other Cummins engines.
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Cummins X15 Diagnostic Information to Collect Before Asking for Help
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Detroit Diesel

Detroit DD13, DD15, DD16 and related systems.
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Detroit DD15: Information That Helps Diagnose a Fault
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PACCAR MX

PACCAR MX-11, MX-13 and related diagnostics.
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PACCAR MX-13: Before Replacing Aftertreatment Parts
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Volvo / Mack

Volvo D11/D13 and Mack MP-series engines and trucks.
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Volvo / Mack Fault Question Checklist
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International / Navistar

International, Navistar and MaxxForce diagnostics.
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Caterpillar

CAT heavy-duty diesel engine discussion.
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Freightliner

Freightliner truck-specific systems and problems.
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Peterbilt

Peterbilt electrical, chassis and truck-specific issues.
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Kenworth

Kenworth electrical, chassis and truck-specific issues.
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Western Star

Western Star truck diagnostics and repair.
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Other Engines & Trucks

Other heavy-duty truck and engine brands.
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Emissions & Aftertreatment DEF, SCR, DPF, EGR, NOx and aftertreatment diagnostics.

DEF / SCR

DEF quality, dosing, SCR efficiency and related faults.
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DEF / SCR Problem: What to Check First
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DPF

Diesel particulate filter faults, ash loading and restriction.
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DPF Restriction: Soot Load Is Not the Same as Ash Load
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Regen Problems

Parked regen, forced regen and failed regeneration.
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Parked Regen Will Not Start: Common Conditions to Check
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NOx Sensors

Upstream/downstream NOx sensor diagnostics.
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NOx Sensor Fault Does Not Always Mean the Sensor Is Bad
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EGR

EGR valves, coolers, flow faults and related problems.
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Aftertreatment Derate

Derates caused by emissions or aftertreatment faults.
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Truck Systems Electrical, transmission, brakes, air, fuel, cooling and other truck systems.

Electrical & Wiring

Wiring, grounds, batteries, alternators, modules and CAN problems.
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Intermittent Electrical Fault: Start With Power and Grounds
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Transmission

Automated and manual transmission diagnostics.
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Automated Transmission Fault: Information to Include
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Brakes / ABS

ABS faults, brake systems and wheel-speed sensor issues.
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ABS Warning Light: Basic Inspection Areas
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Air System

Air leaks, compressors, dryers, valves and pressure problems.
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Fuel System

Fuel pressure, injectors, pumps and contamination.
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Turbo / Boost

Turbochargers, boost pressure, CAC leaks and actuators.
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Cooling / Overheating

Coolant loss, overheating, fans and thermostats.
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Overheating Truck: Stop Before It Becomes an Engine
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Oil Pressure / Lubrication

Oil pressure, consumption, leaks and lubrication faults.
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Low Oil Pressure Warning: Do Not Ignore It
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HVAC / A/C

Cab heating, air conditioning and climate-control problems.
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Repair & Mechanics Repair questions, technicians, tools, parts and practical shop knowledge.

Ask a Mechanic

Technical repair questions for experienced mechanics and technicians.
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How to Ask a Mechanic a Useful Truck Repair Question
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Heavy-Duty Diesel Mechanics

Professional diesel mechanic discussion.
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Mobile Mechanics

Mobile repair services and roadside mechanic discussion.
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Repair Shops

Truck and trailer repair shop discussion.
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Diagnostic Tools & Scanners

JPRO, TEXA, Jaltest, OEM tools and scanners.
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Diagnostic Scanner Buying Guide: Questions to Ask First
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DIY Repairs

Repairs and maintenance performed by owners and drivers.
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Truck Parts & Suppliers

Parts availability, quality and supplier experiences.
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Trailer & Reefer Repair

Trailer, reefer, liftgate and body repair.
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Mechanic & Shop Directory Find and recommend truck repair services by location and specialty.

Canada Mechanics & Shops

Diesel mechanics and truck repair shops across Canada.
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Canada Mechanic & Repair Shop Listing Format
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United States Mechanics & Shops

Diesel mechanics and truck repair shops across the U.S.
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United States Mechanic & Repair Shop Listing Format
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Mobile Diesel Mechanics

Mobile diesel technicians and roadside repair.
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Truck Repair Shops

Heavy-duty truck repair facilities.
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Trailer Repair Shops

Trailer repair, doors, floors, brakes and suspension.
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Reefer Repair

Refrigeration unit and reefer trailer service.
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Truck Tire Shops

Commercial tire installation, repair and roadside tire service.
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Towing & Roadside Assistance

Heavy-duty towing, recovery and roadside help.
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Trucking Jobs Truck driving, mechanic, dispatcher and transportation job opportunities.

Local Truck Driving Jobs

Home-daily and local driving opportunities.
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Local Truck Job Posting Format
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Regional Truck Driving Jobs

Regional driving jobs and dedicated routes.
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Long-Haul / OTR Jobs

Long-distance and over-the-road driving jobs.
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Owner-Operator Opportunities

Owner-operator contracts and opportunities.
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Canada Trucking Jobs

Driving and transportation jobs across Canada.
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United States Trucking Jobs

Driving and transportation jobs across the U.S.
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Dispatcher Jobs

Transportation dispatcher and operations jobs.
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Diesel Mechanic Jobs

Heavy-duty mechanic and technician openings.
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Drivers Looking for Work

Drivers seeking legitimate trucking opportunities.
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Drivers Looking for Work: What to Include and What NOT to Post
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Trucking Groups & Communities Find legitimate driver and trucking communities on messaging and social platforms.

WhatsApp Trucking Groups

Share and discover trucking-related WhatsApp communities.
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WhatsApp Trucking Group Submission Rules
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Facebook Trucking Groups

Useful trucking groups and communities on Facebook.
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Telegram & Other Groups

Telegram and other trucking discussion groups.
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Local Driver Groups

City and regional driver communities.
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Owner-Operator Groups

Owner-operator and small fleet communities.
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Mechanic Groups

Diesel mechanic and technician communities.
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Carrier, Broker & Industry Reviews Share factual trucking business experiences. Include documentation when appropriate and remove private information.

Carrier Reviews

Driver and owner-operator experiences with trucking carriers.
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How to Write a Useful Carrier Review
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Broker Reviews

Payment, communication and load experiences with freight brokers.
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How to Write a Useful Freight Broker Review
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Broker Payment Issues

Discuss delayed, disputed or unpaid freight invoices factually.
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Broker Payment Problem: Documents to Keep
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Factoring Company Reviews

Experiences with transportation factoring companies.
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Dispatch Service Reviews

Experiences with dispatch companies and services.
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Shipper & Receiver Experiences

Pickup, delivery, detention and facility experiences.
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Truck Stop Reviews

Truck stop facilities, parking and service experiences.
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Owner Operators & Small Fleets Business, costs, equipment and operations for owner-operators and small carriers.

Rates & Load Boards

Freight rates, lanes and load-board discussion.
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Rate Discussion: Include the Whole Lane and Cost Picture
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Fuel Costs & Fuel Economy

Fuel prices, MPG and fuel-saving strategies.
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Maintenance Costs

Repair budgets and operating cost discussion.
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Buying Used Trucks

Used truck inspections, models, engines and purchase advice.
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Used Truck Inspection Checklist Before You Buy
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Truck Financing

Commercial truck financing and lease discussion.
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Insurance

Commercial trucking insurance discussion.
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Factoring

Invoice factoring and cash-flow discussion.
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Taxes & Accounting

Trucking bookkeeping, tax and accounting discussion.
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IFTA / IRP / Permits

Fuel tax, registration, permits and operating authority.
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Regulations & Operations Compliance, safety, ELD, customs and trucking regulations.

DOT / FMCSA

U.S. federal trucking regulations and compliance.
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ELD & Hours of Service

ELD systems, logs and hours-of-service rules.
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ELD Problems: Keep Safety and Compliance Separate From Device Troubleshooting
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Canada Regulations

Canadian commercial transportation regulations.
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U.S. Regulations

State and federal U.S. trucking requirements.
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Border & Customs

Canada/U.S. customs, ACE, ACI and border crossings.
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1
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Canada-U.S. Border Load: Documents to Check Before Leaving
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Safety & Inspections

Roadside inspections, CVSA and safety compliance.
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Tickets & Violations

Commercial traffic tickets and violation discussion.
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Weights & Dimensions

Axle weights, permits and dimensional restrictions.
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Roads, Parking & Travel Road conditions, truck parking, routes and driver travel information.

Road Conditions

Construction, closures and difficult truck routes.
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Truck Parking

Truck parking availability and experiences.
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Truck Stops

Truck stop discussion and recommendations.
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Border Crossings

Crossing conditions and practical border information.
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Scale Houses

Scale locations and inspection experiences.
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Weather & Winter Driving

Severe weather and winter trucking.
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Routes & Restrictions

Truck routes, low clearances and restrictions.
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BigRigFaults Community General trucking community discussion beyond diagnostics.

Introduce Yourself

New members, drivers, mechanics and fleet owners.
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Welcome to BigRigFaults Community
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General Truck Talk

Anything trucking that does not fit another section.
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Driver Experiences

Stories and lessons from life on the road.
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Solved Problems

Share confirmed repairs and solutions that helped.
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How to Post a Solved Truck Problem
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Truck Photos

Share trucks, equipment and trucking photography.
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Trucking Videos

Useful trucking and repair videos.
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Industry News Discussion

Discuss important trucking industry developments.
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BigRigFaults Resources Useful technical material, checklists, tools and downloads.

Diagnostic Guides

Technical troubleshooting guides and references.
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BigRigFaults Diagnostic Guide Library
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Checklists & Forms

Inspection, maintenance and operational forms.
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Wiring & Technical References

Useful technical diagrams and reference material.
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Maintenance Resources

Preventive maintenance resources and schedules.
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Useful Apps & Tools

Trucking apps, calculators and digital tools.
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Resource Requests

Request a guide, checklist or technical resource.
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Trucking Marketplace Community marketplace for legitimate trucking-related items and services.

Trucks For Sale

Heavy-duty trucks offered by members and businesses.
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Truck For Sale Listing Format
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Trailers For Sale

Dry vans, reefers, flatbeds and other trailers.
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Truck Parts For Sale

New and used commercial truck parts.
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Tools & Equipment For Sale

Diagnostic tools, shop equipment and trucking gear.
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Wanted

Members looking for trucks, trailers, parts or equipment.
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Services Offered

Legitimate trucking-related services.
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Deals & Partner Offers

Disclosed promotional, sponsor and affiliate offers.
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Affiliate and Partner Offer Disclosure
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API Test Category

API Test Forum

Temporary API forum test
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