The Best J1939 Scan Tool of 2025 – Reviewed and Top Rated

After hours researching and comparing all models on the market, we find out the Best J1939 Scan Tool of 2025. Check our ranking below.

2,653 Reviews Scanned

SaleRank No. #1

ANCEL Heavy Duty Truck Scanner HD601 All System Diesel Diagnostic Scan Tool fits for Cummins, Detroit, Freightliner, International, Paccar, Check Engine for Truck & Car 2 in 1 Code Reader

【Extensive Compatibility】After the upgrade, the compatibility is wider and more accurate! HD601 heavy duty truck scanner supports all major truck models that comply with standard protocols (SAE J1939, SAE J1708, ISO 14230-4, ISO 15764-4 and ISO 9141-2, ISO 27145-4 and Euro6). Fits for Cummins, Paccar, Detroit, Perkins, Freightliner, International, Peterbilt, Ford Heavy Truck, Class 4-Class 8 trucks, etc. It also check engine diagnosis on most cars, minivans and light trucks
【 Full System Diagnostic】HD601 Diesel Scanner supports all system scans of heavy trucks compliant with standard protocols SAE J1939 & J1708, such as Engine, ABS, Transmission, Braking System, ESP, EPS, Fuel System, etc, It is a great scan tool fits for Cummins, Caterpillar, Detroit, Perkins, Maxxforce, Bendix,Wabash, Wabaco, Haldex, Allison, Eaton heavy trucks, With this truck tool, you can get deep analysis data about the system and do some repairs by yourself, saving much time and money.Note: Only heavy truck vehicles that comply with the above protocol can diagnose the entire system
【Enhanced Diesel OBD Scanner】The HD601 Diesel OBD Scanner offers unparalleled diagnostic capabilities for heavy-duty trucks. Beyond code reading, clearing, and live data display, it retrieves vehicle information, freeze frames, and DTCs. With 6, 9, and 16 pin cables, it ensures compatibility with various engines. This scanner's real-world testing prowess ensures comprehensive support for a wide array of heavy-duty truck engines, making it an indispensable tool for truck diagnostics
【DTC Library】+【Life Time Free Update】The built-in DTC library allows you to retrieve the codes directly without searching for the definition in the book. Whether you are a professional mechanic or a DIY car owner, HD601 diesel scanner explains the existing problem, makes it easier for you to understand code definitions and helps you locate vehicle faults. Note: This device cannot directly solve the fault. Plus, you get a lifetime free internet updates, so you always have the latest software for diagnostics in English and Spanish languages
【Friendly Design, Easy of Use】This scanner is plug and play, simple and convenient, and very friendly for beginners. With improved buttons for easy menu navigation. The excellent 2.8 inch LCD color screen makes it easy to view the displayed results and gives you a better overview of your car's problem areas and the identified codes. In addition, the processor is super-fast and responds without lagging, providing maximum comfort and efficiency in diagnostic and service work

SaleRank No. #2

NEXAS Heavy Duty Truck Scanner NL102 Full System Diesel Truck Scan Tool for Cummins, Isuzu, Freightliner, Caterpillar, Detroit, Peterbilt, 2-in-1 Code Reader Read & Clear Fault Codes for Truck & Car

Why NEXAS NL102 Truck Scan Tool? The NL102 outshines other truck scanner with its extensive diagnostic features. It offers full system diagnostics for major trucks meeting standard protocols, along with complete OBD2 functionality. Beyond read fault codes, clear codes and live data display, it enables vehicle info retrieval, freeze frame capture, and DTC lookup. Equipped with 6-pin, 9-pin, 16-pin connectors, it ensures broad truck compatibility. Plus, enjoy lifetime free updates in English, Spanish, and French, keeping your diagnostic scanner software current.
Wide Compatibility - Friendly Reminder: To avoid compatibility issues, please confirm with us via Amazon Messages before purchasing. This heavy duty truck scanner is compatible with all heavy-duty trucks and semi that adhere to standard protocols (J1587, J1939, J1708). It covers a wide range of vehicle models, including Cummins, Detroit, Caterpillar, Freightliner, International, Kenworth, John Deere, Peterbilt, Sterling, Mack, Paccar, Western Star, Mercedes-Benz, Volvo, Scania, MAN, Renault, ERF, Foden, Seddon-Atkinson, Iveco, DAF, SISU, STEYR, ISUZU etc. Equipped with 6-pin, 9-pin, and 16-pin connectors for versatile device compatibility, ensuring stable plug-and-play connections.
Save Hundreds of Money for All Heavy Duty Trucks – This diesel diagnostic scanner supports accurate full-system scans for all heavy-duty trucks that comply with standard protocols (J1587, J1939, and J1708). It can read and clear trouble codes across a range of vehicle systems, including the engine, transmission, instrument panel, drivetrain, brake system, suspension, ABS, ESP, EPS, fuel system, etc. The truck scanner communicates directly with your truck's computer to provide real-time data stream analysis, letting you pinpoint issues with precision. This cuts down on waste from unnecessary part replacements, saving you time and hundreds or even thousands of dollars.
All OBD2 Functions + Battery Health Monitoring – Unlike many obd2 scanners on the market that only cover partial OBD2 features, ours gives you full OBD2 capability: read & clear codes, live data, freeze frame data, I/M readiness checks, EVAP tests, on-board monitor, O2 sensor tests, vehicle info, and DTC lookup. That means more detailed insights for pros and DIYers alike. The NL102 isn't just a code scanner – it's a battery saver. Regularly check your car's battery health, and catch issues before it dies completely. No more unexpected no-starts in the driveway or on the road. It diagnoses battery condition accurately, helping you avoid costly last-minute repairs.
Plug and Play & One-click for DTC: NEXAS diesel scanner is user-friendly. It comes with an intuitive screen and easy-to-understand interface, making it accessible even for non-professionals to get started. And the built-in DTC library in the code reader allows you to directly retrieve codes without searching for definitions in books, making it easier to understand the code definitions and solve problems more quickly.

Rank No. #3

Autel AutoLink AL529HD with Screen Wiper OBD2 Scanner Heavy Duty Truck Code Reader AutoVIN Read/Erase DTCs O2 Monitor Test Check Live Data Advanced AL519/AL529 Compatible SAE-J1939/J1708 Black

Autel’s latest member of its code reader family of tools, the AL529HD can not only diagnose OBDII/EOBD-compatible vehicles but also heavy duty vehicles utilizing SAE-J1939 and SAE-J1708 protocols.
The AL529HD is a professional service tool designed for the Heavy Duty vehicle technician. This easy-to-use handheld tool supports J1939 and J1708 HD Communication protocols to read and erase codes, test and display and record Live Data. The tool also supports all 10 modes of OBDII communications.
AL529HD can read real-time PCM data stream, display real-time oxygen sensor test data, read, store and replay real-time sensor data, print data through Windows PC, multilingual (including English, Spanish and French) menus and DTC definitions.
AL529HD troubleshooting program code prompts to help technicians in effective vehicle diagnosis and maintenance, used for quick status check and driving cycle verification, color-coded leds and built-in speakers provide visual and audible tones to Verify that it is ready.
AL529HD AutoVIN function, quickly identify the code of a specific manufacturer, retrieve vehicle identification information (VIN, CALID and CVN), enhanced OBDII mode 6 access, suitable for domestic, Asian and European models from 1996 and above, A complete 12-month guarantee from the date of purchase.

SaleRank No. #4

2025 LAUNCH CRP129HD Heavy Duty Truck Scanner with DPF Regen, Speed Limit Adjust Reset, Full System Diesel Semi Truck Diagnostic Tool & Code Reader for Cummins Detroit International Paccar

🚜【2025 Top-level Diagnostic Tool, Ideal for Commercial Vehicles】 LAUNCH 129HD heavy duty truck scanner is supports more than 50+ vehicle models, such as light/heavy truck, pickup, buses, trailer, tractor, dumper, agricultural and construction vehicles. It delivers such as DPF regen, speed limit adjustment. 129HD also includes 7+ special services, full system functions, EOBD/HDOBD/OBD2 functions, graphing live data, data screenshot/feedback/Email, 2 year free-update and 24/7 customer service.
🚚【7+ Special Service for Most Commercial Vehicles】 LAUNCH diesel truck 129 HD obd2 scanner is designed for commercial vehicles, it contain 7+ special service for mechanics to do daily auto maintenance in workshops, such as DPF Regen, Oil Reset, Speed Limit Adjustment, ABS bleeding, Injector Coding, Cylinder Deactivation Compression, Clutch Relearn and so on. It can help you handle faults for commercial vehicles, save your money, quickly & efficiently, and win more business!
🚛【Wide Vehicle Range of Compatibility】 LAUNCH 129HD semi truck scanner diagnostic tool is designed to work with OBD2/CAN, J1587, J1708 and J1939 compatible vehicles, covering most mainstream truck models and engines. It support 98% commercial vehicles and 300+ vehicle models. It fit for Cummins, Caterpillar, Detroit, International, Paccar, Volvo, Freightliner, Kenworth, Isuzu, Hino, Western Star, Sterling, Peterbilt, Maxxforce, Peterbilt, Maxxforce, Scania, Man, DAF, Mercedes-Benz, USAFORD,Aisin, Allison, Case, Credo, Deutz and so on.
🚌【OE-Level Full System Diagnostic & Remote Diagnose】 LAUNCH 129HD heavy truck scanner offers full system functions to make the comprehensive diagnostic. It works on Engine, ABS, SRS, SAS, Transmission, TPMS, ESP, EPB, Brake, Park Brake Controller, DPF, Immobilizer, etc, allows you to quickly and comprehensively identify fault problems. You can send the diagnostic report and feedback to remote system or service center, enabling real-time monitoring of multiple vehicles and proactive maintenance scheduling.
🚎【Adcanced DPF Regeneration & Speed Limited Adjust Function】 The DPF function of 129HD integrates monitoring, control, analysis and fault diagnosis capabilities to ensure that the DPF system can operate effectively under various operating condition. It applied to 50+ engine models such as Cummins Caterpillar Detroit International Paccar Volvo Peterbilt . Remote diagnose will transmittethe diagnostic report/feedback to a remote system or service center, which will offer a professional suggestion for your vehicles.

SaleRank No. #5

ANCEL HD430 Heavy Duty Truck Scanner, DPF Reset & Forced Regeneration for Cummins & Caterpillar Engine, Full System HDOBD Diesel Scanner OBD2 Diagnostic Scan Tool Code Reader for Diesel Trucks & Cars

【Wide Compatibility】HD430 supports 12V 24V trucks, equipped with diesel connectors (CAT-9, Diesel 6pin & 9pin) and OBDII 16pin, with strong truck adaptation and compatibility. Product supports SAE J1939, SAE J1708, SAE J1850 PWM, SAE J1850 VPW, ISO 14230-4, ISO 9141-2, ISO 15765-4, ISO 27145-4 truck protocols, provides complete scan & fast scan, and available in English and Spanish, it is suitable for DIY enthusiasts, old-school mechanics, truck owners or small repair shops.
【 D.P.F Regen For Cunmmis & Caterpillar】HD430 supports Cummins and Caterpillar engines for D.P.F reset & regeneration, helping to remove diesel particles from truck D.P.F & meet maintenance schedules, thereby avoiding fault codes, maintaining engine performance, and extending D.P.F & truck life. Even if you aren't a professional mechanic, you can easily perform D.P.F regen using HD430 according to clear instructions, which can help your truck avoid roadside obstacles while reducing your repair time & cost.❕❕❕Note: Not compatible with pickups/light trucks.
【Diesel Full System Diagnostic Tool】HD430 has excellent diagnostic performance, quickly scanning truck systems, detecting truck faults, while supporting the engine, ABS, transmission, fuel system and more. Read the fault code and DTC Lookup help you understand the cause of the fault, quickly clear the fault code after maintenance, so provide you with good maintenance assistance and convenience. HD430 heavy duty truck scanner will provide efficient, fast scanning of your truck system.
【Enhanced Diesel & Gasoline Scanner】HD430 has full HD OBD/EOBD/OBDII functions and supports heavy duty trucks with Cummins, Caterpillar, Detroit and Paccar engines. In addition to read & clear fault codes, view live data, ECUs, vehicle information, it also supports functions such as freeze frame, I/M readiness, on-board monitor test, etc. At the same time, the built-in DTC Lookup helps you instantly see what a fault code means and what needs to be repaired, providing strong support & convenience for your vehicle maintenance.
【Advanced Hardware & Design】4.3-inch screen, 8G memory, 8G TF, 2.4G Wifi & other hardware, your truck repair process will be more stable. Wifi Lifetime Free Update, you can always keep up with the latest diagnostic functions and optimized performance of HD430, compared with others, you can avoid expensive update subscription fees. The imperial conversion to meet your needs for the use of the unit of measurement. Unique horizontal screen button design, your operation will be more comfortable and convenient.

Rank No. #6

NEXAS NL102P Heavy Duty Truck Scanner with DPF Regen Oil Reset, Full System Diesel Diagnostic Scan Tool for Isuzu, Cummins, Detroit, Maxxforce, Hino, 2-in-1 OBD2 & HD OBD Code Reader for Semi & Car

Precision DPF Reset and Regen: NL102P diagnostic scanner provides professional DPF reset and regeneration for ISUZU, Cummins, Detroit, Maxxforce, Hino engines. It supports DOC cleaning procedure, parking DPF regeneration, driving DPF regeneration, on-board DPF regeneration. Helps you to remove accumulated diesel particles, reawaken engine power, maintain engine performance and fuel efficiency. Extends DPF life, avoids malfunction codes caused by DPF clogging. This scan tool puts DPF maintenance right in your hands. And we recommend that customers contact us before purchase to confirm that the vehicle model and year are compatible with the NL102P scanner.
One Tool, Complete Truck Care: NEXAS NL102P diesel scan tool supports accurate full system scanning for all heavy-duty trucks that comply with standard protocols (J1587, J1939, and J1708) after 1996. This includes vehicle systems such as the engine, transmission, ABS, drivetrain, suspension, ESP, cluster, body control, instrument panel, fuel system, etc. It also includes HD OBD/EOBD/OBD2 modes: code reading, clearing, live data, smog testing, etc. This truck scanner connects with your vehicle's onboard computer to pull real-time data streams, enabling precise identification of problems. It reduces unnecessary part replacements due to guesswork, saving you both time and hundreds.
Top-Tier Oil Light Reset Scanner: For any driver, resetting the oil light is a must-do step—especially since regular oil changes keep your vehicle running strong, extend engine life, prevent expensive repairs, and keep you safe on the road. This heavy-duty diagnostic scanner is built to handle key maintenance tasks: Oil light and service reset for Cummins engines; Sensor reset for Detroit, Maxxforce, etc. To ensure the NL102P semi scan tool works with your specific vehicle, be sure to review the user manual before buying.
Versatile Compatibility: NL102P obd2 diagnostic scan tool comes equipped with 6-pin and 9-pin truck-specific connectors, plus a 16-pin standard OBD interface—fully compatible with J1939, J1708, and J1587 protocols. Ideal for U.S. Class 4 to Class 8 heavy-duty trucks, it delivers full-system diagnostics for top brands like Cummins, Detroit, Maxxforce, Caterpillar, Freightliner, International, Kenworth, ISUZU, DAF, Volvo, etc. In OBD2 mode, it works with most U.S.-market cars manufactured since 1996.
Battery Health Monitoring: It features a battery monitoring function that helps you check your vehicle's battery status—including voltage, current, and overall health. This lets you catch potential battery issues early on, preventing unexpected breakdowns due to battery failure, saving on repair costs.

SaleRank No. #7

Diesel Laptops Nexiq USB Link 3 Wired Edition with Repair Information & Diagnostic Software

12 Month Warranty
Includes 9-pin, OBDII, & 6-pin connectors
Includes 90-days of Diesel Repair Professional Subscription. Fault codes troubleshooting trees, wiring diagrams, labor time guides, & much more.
Includes Diesel Explorer - View & Clear fault codes, view live data, download ECM reports, & more.
Wired Edition (No Bluetooth or Wifi)

SaleRank No. #8

ANCEL HD110 Heavy Duty Truck Scanner with DPF Regen and Reset for Detroit Paccar Engine, Full System HDOBD & OBD2 Scanner for Diesel Trucks Lifetime Free Updates

Regain Power, Save Thousands: The HD110 modern semi-truck scan tool’s DPF Regeneration clears clogged filters in minutes! Stop paying for costly shop visits—perform on-demand DPF regen directly from your cab, anytime and anywhere. This diesel scanner diagnostic tool works with all major engines (Detroit, Paccar), including DPF regeneration tools to keep your truck running strong, boost fuel efficiency, and avoid breakdowns. Don’t let a clogged filter stop you—get back on the road faster
For Detroit and PACCAR Engines: The HD110 Bluetooth Heavy Duty Truck Scanner is built specifically for Detroit and PACCAR engines. This powerful truck scanner diagnostic tool comes with all the necessary adapters, including 16-pin and 9-pin, to support a variety of diesel trucks. Common engine models include PX-7, PX-9, MX-11, MX-13, DD13, DD15, DD16, and more. Whether you need an OBD scanner for diesel trucks or a diesel scan tool, this tool has you covered to keep your truck performing at its best
All HDOBD/OBD2 Diagnostics—Comprehensive Engine Check: The HD110 diesel scanner works with a wide range of diesel engines and supports full HDOBD and OBD2 diagnostics. Easily monitor performance, identify engine issues, and clear fault codes with this code reader for diesel trucks. Whether you’re on the road or in the shop, get real-time, accurate data to keep your truck in top shape and prevent unexpected breakdowns. Perfect for fleet operators who need quick and reliable diagnostics
Free Upgrades, No Subscription Fees—Maximum Value: Get free life-time software upgrades with the HD110 diesel scanner—no subscription fees! Stay current with the latest updates and enhancements without any extra costs. This is the cost-effective choice for truckers who want a reliable diesel scanner without ongoing fees. Maximize your investment with the most up-to-date technology for your truck’s diagnostics
Easy to Use, Simple Interface—Get Started in Minutes: Designed for simplicity and portability, the HD110 diesel scanner is incredibly easy to use. Just plug it in, scan, and go. This truck scanner is compact and lightweight, perfect for owner-operators, small fleets, and technicians. Whether you’re using it as an OBD2 scanner for diesel trucks or a general diesel scan tool, its user-friendly interface ensures a smooth, hassle-free experience. No complicated setups—just quick diagnostics when you need them most

Rank No. #9

FOXWELL HD500 Heavy Duty Truck Scanner, Diesel Scaner Diagnostic Tool with DPF Regeneration/Injector Cutoff, fit for Cummins, Detroit, Caterpillar, Paccar, Hino, Lifetime Free Update, Orange

【Advanced DPF Service Functions】FOXWELL HD500 heavy duty truck scanner supports DPF regeneration, reset, and status monitoring (DPD, DPR) to prevent clogging and improve fuel efficiency. Keep your engine clean and extend DPF life with regular maintenance.
【Professional Cylinder Cut-Off Test】The cylinder cut-off test can diagnose engine failure problems. The HD500 heavy duty scanner truck diesel sends a command to the ECU to isolate each injector and identify malfunctioning cylinders. Great for diagnosing engine power imbalance and injector issues in heavy-duty trucks. 👨‍🔧Ideal for advanced users and repair shops.
【Speed Limit Rest & ABS Bleeding】Set engine and road speed limits when stationary to enhance driver safety. This truck diagnostic scanner also supports ABS bleeding to remove air from the system and ensure firm brake pedal response. ⚠️Speed limit reset is limited to select models (not supported on Cummins engines). Please confirm VIN compatibility before purchase.
【Extensive Diesel Engine Coverage】HD500 diesel scanner diagnostic tool is tailored to vehicles equipped with cummins, cat, detroit, paccar, international, hino. The semi truck diagnostic tool includes 6-pin, 9-pin, CAT-9, CAT-14, and 16-pin adapters. Easily connect and diagnose your truck's engine with precision. (Alison transmission, VGT calibration and bidirectional functions are not supported)
【All-in-One Truck Diagnostic Solution】The HD500 semi truck scanner diagnostic tool can diagnose key systems—Engine, ABS, SRS, EPB, Park Brake, DPF—with complete OBD/EOBD/OBD2 and supports protocols: J1939, J1708, J1587, ISO9141-2, ISO14230-2, ISO15765-4. Works with heavy trucks, light-duty pickups, buses, trailers, tractors, and construction vehicles.

Rank No. #10

ANCEL X7HD 10'' Heavy Duty Truck Scanner, Semi Trucks Full System Diagnostic Tool, Bidirectional Diesel Scan Tool with DPF, ECU Coding, 40+ Reset for Cummins, Detroit, Caterpillar, Volvo, Paccar etc

🔥🔥🔥2025 New Functions Making X7HD the Top Dog - Big Surprise!!! ANCEL X7HD truck scanner 10 major functional advantages .✅>Full HDOBD/OBD2 Function ✅>ALL System Diagnostic ✅>42+ Reset Function ✅>Active Test / Bi-Directional Control✅>ECU Coding✅>Graphing Live Data✅>Wide Compatibility ✅>2 Yrs Free Update✅>Remote Operation✅>Bluetooth 5.0 & Wifi In addition, 8 major hardware advantages: ✅>6000 mAh✅>10.1 inch Tablet✅>2G RAM✅>32G ROM (Expandable to 128GB)✅>Data Record & Replay & Print✅>Android 10.0✅>Bluetooth 5.0 & Wifi✅>14 Languages
🚛OEM DPF Forced Regen & Cylinder Cutout Test & more - ANCEL X7HD diesel scanner diagnostic tool not only supports DPF regeneration, DPF reset, DPF related information reset, DPR state reset, DPD forced regeneration etc, which helps you better solve the exhaust aftertreatment system problems, but also supports activate motor to do exhaust air in ABS Automatically. Moreover, it features TPMS activation, cylinder cut-off and learning functions
🚛Advanced ECU Coding & Programming - ANCEL X7HD 10.1inch truck scanner diagnostic tool is equipped with advanced ECU coding, supports Level calibration, Idle speed learning and Adjustment, Camshaft timing control learning, Control unit adaptations, Injector Codes, Read/Write VIN, Road speed limit optional vehicle speed set, etc... PLEASE NOTE that ECU codes are not compatible with all vehicles, please send us your VIN# to check vehicle compatibility
🚛42+ Reset Functions & Bidirectional Control - 2025 newest top heavy duty truck scan tool, comes with 42+ special services (ECU, Speed Limit and Idle Reset, Oil Reset, Injector Coding, EPB, ABS, SRS, Suspension, Throttle, etc. and always keep growing), which meet all your various needs for service and maintenance
🚛10 Inch All Systems Diesel Scanner & Full HDOBD/OBD2 Modes - ANCEL X7HD diesel truck scan tool supports all systems scan, such as Engine, Brake, Retarder, TECU Transmission, Tachograph, ABS, SRS, TPMS, EPB, SAS, ESP, and other vehicle systems, comes with 10 obd2 service modes: read/erase error codes, Data Stream, I/M Readiness, Vehicle Information, Actuations, DTC Lookup, EVAP, view freeze frame, etc

Last update on 2025-11-10 / Affiliate links / Images from Amazon Product Advertising API

How Do You Buy The Best J1939 Scan Tool?

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We provide an J1939 Scan Tool buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available J1939 Scan Tool currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

Brand Value: Every brand of J1939 Scan Tool has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
Features: What bells and whistles matter for an J1939 Scan Tool?
Specifications: How powerful they are can be measured.
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Product Reliability: How sturdy and durable an J1939 Scan Tool is should be an indication of how long it will work out for you.

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FAQ:

Q: What is the J1939 data link?

A: SAE J1939 defines five layers in the seven-layer OSI network model, and this includes the Controller Area Network (CAN) ISO 11898 specification (using only the 29-bit/”extended” identifier) for the physical and data-link layers. Under J1939/11 and J1939/15, the data rate is specified as 250 kbit/s, with J1939/14 specifying 500 kbit/s.

Q: What is J1939 software stack?

A: What is J1939 stack? J1939 stack is an embedded software stack with layered architecture, compliant with SAE J1939 standard. This pre-tested software stack, designed by our embedded automotive engineers, can be easily integrated with commercial vehicle applications for diagnostics and communication services.

Q: What is diagnostic scan tool?

A: A scan tool is a car diagnostic tool that can exhibit a wide range of features. Scan tools typically include a code reader, the ability to view and sort live data, and some type of knowledge base.

Q: What is an automotive scan tool?

A: An automotive scan tool (scanner) is an electronic tool used to interface with, diagnose and, sometimes, reprogram vehicle control modules.