[Tested] 5 Best Transmission Scanners for 2024

Robert Stage

We’ve spent 2 weeks testing over 9 popular transmission scanners, and now we’re sharing the top 5 with you in this article.

All 5 scanners featured here are capable of pulling out transmission codes. We’ve also considered factors like scanning speed and special functions for the transmission system during our evaluation.

You can trust that among our carefully curated recommendations, you’ll find the perfect scanner for your specific needs. 

For further details on testing durations and the number of test samples, please refer to the table below:

TesterOBD Advisor’s Testers
Testing dateSep 15 – Sep 29, 2023
Number of tested products9
Number of tested cars5

Best Transmission Scanners Comparison Chart

[Mobile users: Swipe left for full table]
Transmission Diagnostics
Fluid Temp Reading
Transmission Relearn
Check Price
Editor’s Pick
Launch CRP123

Best Transmission Scanners: Detailed Review

#1. Launch CRP123

Launch CRP123

Launch CRP123


Price: Under $150


  • 4-system codes
  • Straightforward
  • Fast


  • Quite confusing registration

Launch CRP123 takes the top spot in our list because of its fantastic diagnostic abilities in four essential systems: Transmission, ABS, SRS, and Engine. 

One of the things we love most is how you can choose which system to focus on.

For example, if you pick the transmission system, you’ll get three options: Read Transmission Codes, Clear Fault Memory, or Read Transmission Data Stream. All of these give you valuable data about the transmission system, helping you identify any issues quickly.

Plus, it lets you view live data for the transmission, even including the transmission temperature. The 3.5” large screen makes it super easy to see all the important details. In terms of performance, we’d give it a perfect 10/10.

Launch CRP123X is one of the best scanner for reading transmisison codes.
Launch CRP123X comes with a nice carrying case is another plus.

Now, there’s just a tiny hiccup – the updates can be a bit tricky. You’ll need to use a USB and update the scanner via a PC, which can be a little inconvenient.

All in all, the Launch CRP123 is the most budget-friendly scanner that home mechanics can get for thorough transmission system diagnostics. It’s a real gem!

Today’s best Launch CRP123 price:

#2. TOPDON AD500



TOPDON AD500 is designed to address the limitations of the Launch CRP123 and make your car maintenance experience easier.

First, TOPDON AD500 comes with a touchscreen and buttons. It’s super easy to use – just one touch, and you’re done with updates in seconds. It’s quick and convenient, perfect for those who are a bit impatient.

In addition to its user-friendly interface, the TOPDON AD500 also offers three special functions: Oil Reset, SAS Reset, and Throttle Reset. These are the three most commonly needed functions for home mechanics who want to take care of their cars. 

The only minor hiccup we noticed is the occasional unreliability of the autoscan for VIN. It worked for only 8 out of 10 cars we tested. However, it’s not a major issue because you can simply type in the VIN, and it will still correctly identify the vehicle.

If you’re in search of a reliable scanner to tackle transmission problems, investing in the TOPDON AD500 is a solid choice. It is incredibly user-friendly and packed with all the features you’d want.

Today’s best TOPDON AD500 price:

#3. BlueDriver




Price: Under $100


  • Cheap
  • User-friendly with 1-click update
  • Full-system diagnostics
  • Include repair suggestions


  • Can’t read transmission fluid temp
  • Can’t pull transmission codes directly

When we compare Bluedriver to Launch CRP123, there are some key advantages that Bluedriver offers. Let’s take a closer look:

Bluedriver doesn’t just read transmission codes; it can also extract trouble codes from all the systems in your car. We put it to the test on an Audi A6, and here’s what we found:

BlueDriver can read transmission codes.
BlueDriver pull outs all troubles codes (including trans codes).

Not only can Bluedriver pull all trouble codes, but it also features a handy RepairReport function. This feature will suggest the type of repair needed and even give an estimate of the cost! It’s like having a personal mechanic right in your pocket, guiding you through the steps to troubleshoot and fix the problem. This is a feature that the Launch CRP123 doesn’t offer.

Bluedriver also simplifies the update process which could be a bit complex with the Launch CRP123, offering a one-click update function. This saves users like us a significant amount of time and effort.

You can update BlueDriver easily with only one tap
Tap “Update sensor” to update the BlueDriver.

Now, let’s address one area where Bluedriver falls short compared to Launch CRP123. Its live data only covers the engine system, which means you won’t be able to access the transmission temperature using this device.

Overall, we firmly believe that Bluedriver is the most user-friendly scanner available. Its wireless connection is especially convenient for those who prefer to move around freely while working on their car.

Today’s best BlueDriver price:

Read more: BlueDriver Bluetooth Pro Scanner Review [Updated 2023]

#4. XTOOL AD20 Pro




Price: Under $100


  • Full-system diagnostics
  • Fast connection
  • Easy to use


  • Live data in text only

XTOOL AD20 Pro is like Bluedriver’s twin but comes at only half the price. 

What really caught our attention was the modern interface of the XTOOL app. When performing a full system scan, the app provides animated visuals to indicate which system is being scanned and offers detailed updates on the scanning process. These animations really make the 4-minute wait for the in-depth diagnostics much more engaging.

And the good news is, this app works seamlessly on both iOS and Android devices, so iPhone users can breathe easy.

We’re also impressed by the live data interface. Not only is the refresh rate fast, but the unique interface that mimics a car’s dashboard makes collecting data a genuinely enjoyable experience. Overall, we give this scanner top marks for its user-friendly design.

However, it’s worth noting that this scanner doesn’t provide transmission temperature readings. If that’s a priority for you, we recommend considering alternatives such as the Launch CRP123 or Topdon AD500.

In a nutshell, with a price range of about $60-$70 and such impressive features, the XTOOL AD20 Pro is definitely worth serious consideration. Especially for home mechanics looking for an affordable Bluetooth scanner with full-system scanning capabilities, this one stands out as the top choice.

Today’s best XTOOL AD20 Pro price:

#5. XTOOL D7




Price: Under $500


  • Transmission adaptive
  • Full-system diagnostics
  • Active tests
  • 36+ service functions
  • Key programming
  • Excellent customer support


  • No wireless connection

We’ve got XTOOL D7 for you if you want advanced functions like transmission relearn. 

What sets the XTOOL D7 apart is its gearbox relearn function, a feature not commonly found in scanners at this price range. 

Don’t let the affordability fool you, though. This scanner can relearn a transmission after a valve body replacement on a 2013 Subaru Legacy CVT or even perform a transmission quick learning on challenging vehicles like a 2008 Ram 2500.

What does this mean for you?

It means that with this powerful scanner, you can diagnose and address any transmission issues, saving you the costly shop fees.

As a professional scanner, the XTOOL D7 also offers a wide range of special functions such as: key programming, TPMS diagnostics, and ABS bleeding.

While these special functions may not be available for every vehicle, the key programming function, in particular, works flawlessly on most cars.

In fact, the D7 scanner programmed Dodge key fobs faster than all devices under $500 we had previously tested. This function alone can save you $300 each time you need to program new keys compared to dealership prices.

Overall, the XTOOL D7 is an excellent bidirectional scan tool that excels in transmission relearn and offers numerous advanced functions, especially when considering its affordable price.

Today’s best XTOOL D7 price:

Final thought

So, if you’re wondering about our two top favorite scanners for transmission, here they are:

  • Launch CRP123: This is our number one pick. It can handle nearly 90% of the diagnostics and repair needs when it comes to transmission systems. Plus, it comes at a budget-friendly price.
  • XTOOL D7: This one offers transmission relearning and comes at a price that’s hard to resist. It’s a great choice for both home mechanics and professionals.

These two scanners pack a punch when it comes to dealing with transmission issues. You can’t go wrong with either choice!

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