A good scan tool will display the error code that points to the problem a vehicle is having.
Not all scan tools can read transmission codes with only certain units with features to read and diagnose transmission errors.
What are OBDII Transmission Codes?
Modern vehicles have built-in electronics managed by the onboard computer (ECM/PCM).
The ECM receives data from various sensors on how the engine is performing as well as the transmission.
When an error occurs, the ECM reports the error as an OBDII code which will point to the problem.
There are many OBDII scan tools that give basic engine codes, with most unable to read ABS, SRS, or transmission errors.
Transmission codes are in the P0700 to P0799 and above P1000, with most basic scan tools unable to read these.
Example Transmission OBDII Codes
- P0700 Transmission Control System Malfunction
- P0701 Transmission Control System Range/Performance
- P0702 Transmission Control System Electrical
- P0703 Torque Converter/Brake Switch B Circuit Malfunction
Global VS. Manufacturer Specific Transmission Codes
Global OBDII codes are agreed-upon error codes that work with any vehicle.
Manufacturer Specific codes only work with certain vehicles.
Global codes always use a “0” as the second number, such as “P0709 Transmission Range Sensor Circuit Intermittent.”
Manufacturer Specific codes use the number “1” as their second character.
For example, a “P1860 Torque converter clutch (TCC) solenoid -circuit malfunction” is a Chevrolet manufacturer-specific transmission code.
There are many good units available, with those below our picks for the best scan tools that can read transmission codes.
As always, be sure to read reviews on Amazon, here, forums, or elsewhere to be sure a unit is a good fit for you.
*This post contains affiliate links.
Our Picks for Best OBDII Scan Tools That Read Transmission Codes
- Launch Creader VII
- ANCEL FX2000
- Autel MaxiLink ML629
- iCarsoft CR Pro
- OTOFIX D1 Lite
LAUNCH Creader VII+ OBD2 Scanner ABS SRS Transmission and Engine Code Reader Diagnostic Scan Tool
Launch makes many good OBDII scan tools, including the Creader VII.
ANCEL FX2000 Vehicle OBD2 Scanner Automotive Car Code Reader Check Engine ABS SRS Transmission Diagnostic Scan Tool
The ANCEL FX2000 is a good unit built with many nice features including reading transmission errors.
Autel ML629 OBD2 Scanner ABS SRS Engine Transmission Diagnoses OBD II Full Functions Upgraded Version of the ML619 for DIYers Professionals
The Autel MaxiLink ML629 is another nice unit to find transmission problems.
iCarsoft CR Pro Professional Multi-System Multi-Brand Car Diagnostic Tool Scanner incl. Battery Tester, Read and Clear Engine, Transmission, Airbag, ABS Trouble Codes
The iCarsoft CR Pro is a multi-system OBDII scan tool that has many functions, including scanning for transmission codes.
It also has wide compatibly with many different types of vehicles, both foreign and domestic.
OTOFIX D1 Lite Automotive OBD2 Scanner, [2 Years Free Update] 2023 with Bi-Directional Control Scan Tool, All System Diagnoses, 38+ Functions, Oil Reset, EPB, SAS, BMS, ABS Bleeding, Auto VIN, FCA SGW
The OTOFIX D1 Lite is an advanced scan tool that can not only read transmission codes but do much more.
A Bi-directional scan tool means it can not only read a vehicle computer but also send commands back.
Most will have no need for such an advanced scan tool, but if you are a busy DIY mechanic or a small shop, it might be worth a look.
Finding a good OBDII scanner that can read transmission codes is like finding any other tool.
It must be easily understood by the user, and what works for one person may not work for another.
Make sure any unit bought is compatible with the car or truck you plan to work on.
Most units are likely to be compatible, but it is always best to make sure before buying a unit.
Also, a unit that can be updated is good to have for adding data the tool can read and expanding its ability.