If you own a GM vehicle and need a reliable tool to diagnose issues, this roundup of the best obd2 scanner gm picks practical options for DIYers and pros. Below you’ll find adapters, basic code readers, Bluetooth dongles, and advanced bidirectional scanners that work well with many GM models. I tested compatibility notes, ease of use, and value so you can pick the right tool without the guesswork.
Quick Product Comparison
Our Top 9 Best Obd2 Scanner Gm Reviews – Expert Tested & Recommended
1. Autel Daewoo and GM OBD2 to OBD1 Adapter 12-pin to 16-pin Connector Works with Autel Scanners
The Autel GM/Daewoo adapter is a simple bridge that helps older GM and Daewoo vehicles talk to modern scanners. It’s built solid and plugs in with little fuss. If you have an OBD1 12-pin port, this adapter is often the missing link.
Key Features That Stand Out
- ✓ Direct 12-pin to 16-pin conversion for GM/Daewoo OBD1 cars
- ✓ Designed to work with Autel scanners and many generic OBD2 tools
- ✓ Sturdy build and snug connector fit
- ✓ No electronics — passive adapter for reliable signal pass-through
Why We Recommend It
This adapter fixes a common problem: older GM cars that lack a native OBD2 port. It keeps things simple and avoids messy wiring. For anyone trying to use a modern scanner on legacy vehicles, it’s a practical tool.
Best For
Owners of classic GM/Daewoo vehicles and mechanics who need a no-nonsense adapter for diagnostics.
Pros and Cons
Pros:
- Solid connector fit and durable construction
- Works with many Autel and third-party scanners
- Passive design reduces failure points
Cons:
- Limited to vehicles that physically match pinouts
- Does not add any advanced diagnostic features by itself
Customer Reviews
Customer Review: ‘The adapter fits securely and provides a dependable link between older and newer systems. It makes diagnostics straightforward by bridging the gap without any loose or unstable connections. The build feels durable, with no flimsy parts that might wear out quickly. Setup is simple, and once connected’
Customer Review: ‘The adapter fits securely and provides a dependable link between older and newer systems. It makes diagnostics straightforward by bridging the gap without any loose or unstable connections. The build feels durable, with no flimsy parts that might wear out quickly. Setup is simple, and once connected’
2. OBD2 Scanner Diagnostic Tool with Live Data, Check Engine Code Reader, Battery Test for OBDII Vehicles
This handheld OBD2 scanner reads live data, checks codes, and runs battery tests. It’s a good step up from simple Bluetooth dongles if you want onboard screens and quick battery info. The interface is straightforward for first-time users.
Key Features That Stand Out
- ✓ Live data streaming and I/M readiness checks
- ✓ Battery test and basic system scans
- ✓ Broad post-1996 vehicle compatibility
- ✓ Simple keyboard shortcuts for quick access
Why We Recommend It
It balances features and price. You get more than code reading without needing a phone. Many people will find it easier to use than app-based dongles, especially when diagnosing battery or readiness issues.
Best For
DIYers who want a dedicated handheld unit with basic advanced features like battery testing and live data.
Pros and Cons
Pros:
- Clear live data and easy-to-read menu
- Battery health test built-in
- Works with a wide range of OBDII vehicles
Cons:
- On-unit interface is less flexible than phone apps
- Limited advanced functions compared to pro-level tools
Customer Reviews
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Customer Review: ‘{“AUI_72554″:”C”,”AUI_KILLSWITCH_CSA_LOGGER_372963″:”T1″,”AUI_TEMPLATE_WEBLAB_CACHE_333406″:”C”,”BW_AUI_CXC_ALERT_MEASUREMENT_1074111″:”C”,”BW_AUI_STEPPER_ENABLE_STRATEGIES_1_1330429″:”T1″}’
3. MOTOPOWER MP69033 OBD2 Code Reader Engine Fault Scanner CAN Diagnostic Tool for OBDII Cars
The MOTOPOWER MP69033 is a no-frills code reader with a clear screen and built-in DTC library. It’s plug-and-play; ideal if you want quick code reads without apps or phone pairing. The classic LCD and physical buttons are easy to use in the garage.
Key Features That Stand Out
- ✓ Built-in DTC lookup to explain codes
- ✓ Supports multiple OBDII/CAN protocols
- ✓ 2.8″ LCD with white backlight and contrast control
- ✓ No batteries required—powered by vehicle OBD port
Why We Recommend It
It’s inexpensive and does the basics very reliably. If you want to read and clear codes and see basic live data, this device delivers that with minimal fuss.
Best For
Budget-minded car owners and DIYers who prefer a physical screen and immediate results.
Pros and Cons
Pros:
- Affordable and easy to use
- Built-in code definitions save time
- Works without apps or phone pairing
Cons:
- Limited advanced functions (no ECU coding)
- Small screen for graphing live data
Customer Reviews
Customer Review: ‘⭐⭐⭐⭐⭐This OBD2 scanner works exactly as expected. It was very easy to use—just plug it into the car and it immediately reads the engine codes with no setup or app needed. The screen is clear, and the buttons are simple to navigate, even for someone with no mechanical experience. It helped me underst’
Customer Review: ‘Easy to use and works with CAN software as stated. You’d first have to verify what software your vehicle uses to determine its functionality. For my car it works well, very reasonable price.’
4. OBD1 to OBD2 GM Adapter Cable 12-pin to 16-pin OBDI Connector for GM Diagnostic Tools
This OBD1-to-OBD2 adapter cable aims to connect older GM diagnostic sockets to modern tools. The cable feels well-made, but pin alignment matters. If pins don’t match your vehicle, diagnostics won’t work.
Key Features That Stand Out
- ✓ Male-to-female 12-pin to 16-pin adapter cable
- ✓ PVC and metal construction for durability
- ✓ Flexible length suitable for garage use
- ✓ Designed specifically for GM OBD1 to OBD2 conversion
Why We Recommend It
When the pinout matches, this cable saves time and avoids custom wiring. It’s a useful accessory if you know your vehicle’s pin arrangement and need a clean adapter solution.
Best For
Owners of OBD1 GM cars who already know their pin configuration and need a plug-and-play adapter cable.
Pros and Cons
Pros:
- Rigid construction with quality materials
- Simple to use when pinouts match
- Good value compared to custom adapters
Cons:
- Reports of incorrect pin alignment on some units
- May not work for all legacy GM models without verification
Customer Reviews
Customer Review: ‘I need to scan my 89 Firebird. This adapter cable It doesn’t work. I have heard the pins in the connector are in the wrong location. I’m not going try and figure out pin location in connector.’
Customer Review: ‘I need to scan my 89 Firebird. This adapter cable It doesn’t work. I have heard the pins in the connector are in the wrong location. I’m not going try and figure out pin location in connector.Read more’
5. Bluetooth OBD2 Scanner for iPhone Android AI Diagnostic Tool Real-Time Data for 1996 and Newer Vehicles
This small Bluetooth dongle pairs with iPhone or Android and offers AI-powered reports and live graphs. It’s tiny, always ready, and great when you want mobile diagnostics without a bulky device.
Key Features That Stand Out
- ✓ AI-generated car health reports and code explanations
- ✓ Real-time data graphs on your phone
- ✓ Compact, wireless design—plugs in and stays put
- ✓ Works with most 1996-and-newer vehicles
Why We Recommend It
For people who use a phone for everything, this Bluetooth scanner feels modern and flexible. The AI report saves time when you don’t know what a code means.
Best For
Smartphone users who want quick, easy-to-understand diagnostics and live charts on the go.
Pros and Cons
Pros:
- Compact and wireless—very convenient
- Helpful AI reports for beginners
- No subscription fees (per reviewer)
Cons:
- Depends on app quality for advanced features
- Wireless dongles can be less stable on some phones
Customer Reviews
Customer Review: ‘My husband really loves this Bluetooth OBD2 scanner and uses it all the time in his car. It connects quickly to his phone and is very easy to use, even if you’re not a mechanic. The app gives clear and accurate information about the car, helps identify engine codes, and saves a lot of time and money’
Customer Review: ‘This OBD2 scanner is super easy to use and connects instantly to my phone. The AI reports make error codes simple to understand, even for beginners. I love seeing real-time data and clearing the check engine light myself. No subscription fee is a big plus. It’s compact, reliable, and gives me real p’
6. Launch X431 Creader Elite 2.0 Bidirectional OBD2 Scanner with ECU Coding and over 100 Services for GM
The Launch X431 Creader Elite 2.0 is a pro-grade tool with ECU coding and many service functions. It’s more powerful and feature-rich than basic readers and is geared toward serious DIYers and small shops.
Key Features That Stand Out
- ✓ ECU coding and active testing
- ✓ 100+ service functions including battery and brake resets
- ✓ Fast scan speeds and good vehicle coverage
- ✓ Free features for many FGC series vehicles
Why We Recommend It
If you need professional functions like ECU coding and bi-directional control, this unit gives a lot of value for the price. It handles complicated jobs that simpler scanners can’t.
Best For
Independent shops and experienced DIYers who want near-dealer level functions without paying dealer prices.
Pros and Cons
Pros:
- Comprehensive feature set including coding and active tests
- Good build quality and fast performance
- Useful for a wide range of repairs and resets
Cons:
- Higher cost than basic readers
- Some advanced features may require learning curve
Customer Reviews
Customer Review: “Finally got a scanner that can scan my 2025 Sierra. This is a pretty fast loading scanner! Launch always has the best equipment, The LAUNCH X431 It’s user friendly, portable, and durable, making it great for both DIYers and pros. handy tool for checking your car’s health. It lets you control differe”
Customer Review: ‘This is my 3rd Launch scan tool, and I keep coming back to Launch because they offer industry leading support for so many makes and model.This c reader elite tool is great for quick jobs like Subaru park brake release if you’re doing a simple brake pad job.Registering a battery on a bmw? No problem!’
7. A-Premium PD100G GM Full System OBD2 Bidirectional Scanner with ECU Coding and Reset Functions for Chevy GMC
The PD100G targets GM models with OE-level diagnostics and bi-directional control. It’s tailored to GM systems and focuses on useful resets and ECU-level access for common maintenance tasks.
Key Features That Stand Out
- ✓ Full-system GM diagnostics from 1996–2025 models
- ✓ Bi-directional control and active tests
- ✓ ECU coding and multiple reset functions
- ✓ Designed specifically for Chevy, GMC, Buick, Cadillac
Why We Recommend It
When working mostly on GM vehicles, this tool gives focused coverage and features that matter most for these models. It’s an efficient alternative to generic scanners.
Best For
Mechanics and owners who focus on GM makes and need comprehensive service functions.
Pros and Cons
Pros:
- Targeted GM coverage and useful service tools
- Includes active tests and ECU functions
- Good option for fleet or multi-GM households
Cons:
- Some advertised coding features may be limited on non-GM models
- Mixed reports on advanced function reliability
Customer Reviews
Customer Review: ‘Could see things about the vehicle and status but could not change anything. For me, that made this useless and I returned it.’
Customer Review: ‘Misleading advertisement only does it for BMW and other high-end models does not ECU coding for the rest misleading returning item.’
8. BLCKTEC 420 Bluetooth OBD2 Scanner Code Reader for iOS Android for 1996 and Newer Cars
The BLCKTEC 420 is a reliable Bluetooth dongle paired with a companion app. It’s simple, well-priced, and gives straightforward code reads and app-based repair suggestions.
Key Features That Stand Out
- ✓ App-based diagnostics with repair suggestions
- ✓ Durable hardware—survived drops per reviewer
- ✓ Works with iOS and Android
- ✓ Free firmware updates to stay current
Why We Recommend It
It’s a practical balance of ease and functionality. The app-led workflow helps hobbyists find parts and common fixes quickly.
Best For
Owners who want a cheap and dependable Bluetooth reader with helpful app features.
Pros and Cons
Pros:
- Good app integration and updates
- Durable in real-world use
- Accurate enough for smog checks and basic repairs
Cons:
- App experience can vary by phone
- Limited advanced features compared to pro tools
Customer Reviews
Customer Review: ‘Neat little tool and easy to use. It will run a diagnostic test on your vehicle and show the different codes that need attention. The thing I like mostly is you can sync this tool to your phone by downloading a free app and the app will suggest the parts you will need to fix your vehicle! Pretty nea’
Customer Review: ‘Good device it accurately lets me know when a vehicle passes a smog check and if it has any serious issues depending on the codes, I’ve dropped this product many times and it’s still working perfectly fine, easy to use this is actually the second time I purchase it good investment 🙌🏼’
9. OBD2 Scanner S512 System Diagnostic Tool for BMW and GM with 28 Reset Functions and ECU Coding
The S512 targets BMW and GM systems with a wide range of reset functions and ECU coding. It’s feature-rich and useful for owners who need service-level resets without a dealer visit.
Key Features That Stand Out
- ✓ Full system diagnostics for BMW and GM
- ✓ 28 hot reset services including EPB, SAS, and oil resets
- ✓ ECU coding and Wi‑Fi software updates
- ✓ Wide model compatibility for OBDII vehicles
Why We Recommend It
It’s appealing if you want a single tool to handle many maintenance resets and coding tasks. The Wi‑Fi updates help keep it current for new models.
Best For
Owners of BMW and GM cars who need frequent resets and occasional coding without dealer fees.
Pros and Cons
Pros:
- Extensive reset services and coding features
- Works across a broad range of GM and BMW models
- Wi‑Fi updates for new software
Cons:
- Mixed reports on initial reliability and support
- May require firmware updates and a learning curve
Customer Reviews
Customer Review: ‘Successful in resetting the angle sensor on my 2015 Chevrolet Volt. Appears to be well made, it was able to download the latest software over wifi. However I could not find a website to explore further information or support. Long term product support is questionable.’
Customer Review: “This scanner does not work at all. I’ve tried for weeks to get this thing to register any data from my grand daughter’s ’07 BMW 325i and it would not perform one function. Wouldn’t even register her brand new battery. I had to buy another scanner. I waited to use this scanner for weeks, due to my “
Complete Buying Guide for Best Obd2 Scanner Gm
Essential Factors We Consider
When choosing the best obd2 scanner gm, focus on compatibility, features, and ease of use. Check whether the tool supports full-system scans, ECU coding, or only generic OBDII codes. Also note if you prefer a physical handheld unit or a Bluetooth dongle that uses your phone.
Budget Planning
Entry-level readers cost under $50 and handle basic code reading and clearing. Mid-range units ($50–$200) add live data, battery tests, and limited service functions. Professional scanners and bi-directional tools typically run $300+ but offer ECU coding and active tests worth the price for frequent users.
Final Thoughts
Pick a scanner that matches how you work. For occasional code checks, a Bluetooth dongle or basic reader is enough. If you repair GM vehicles regularly, invest in a GM-focused bidirectional tool. Always confirm vehicle compatibility before buying.
Frequently Asked Questions
Q: Will an OBD2 scanner work with my older GM vehicle?
A: It depends. Vehicles made before 1996 (US) may use OBD1 or manufacturer-specific connectors. For many older GM cars you’ll need an adapter like the 12-pin to 16-pin models listed above.
Q: Do I need a paid app or subscription for Bluetooth OBD2 dongles?
A: Many basic functions are free, but advanced features or car-specific coding can require paid apps or subscriptions. Check the product listing and app description before purchase.
Q: Can these scanners reset service lights and perform coding?
A: Some models (like Launch X431 and PD100G) include reset and ECU coding features. Entry-level code readers typically cannot perform resets or coding.
Q: Is a handheld scanner better than a Bluetooth dongle?
A: It depends on preference. Handheld scanners don’t rely on smartphones and often have dedicated buttons and screens. Bluetooth dongles give richer visuals via phone apps and are more portable.
Q: Do I need special training to use bi-directional scanners?
A: Basic functions are usable by DIYers, but ECU coding and active tests require caution and some technical know-how. Follow instructions and backup settings where possible.
Choosing the right tool for your GM vehicle is about matching features to needs. If you’re unsure, start with a simple scanner and upgrade when you need coding or advanced resets. Happy wrenching — and if one of the tools above looks right for you, click the check price button to compare options and buy with confidence.