Launch X431 HD Old Module vs. HD III New Module

Comparison: Launch X431 add-on heavy duty module new vs. old.

Launch X431 heavy duty module HD Old heavy duty adapter HD III New heavy duty adapter
Image launch-x431-heavy-duty-module-2 launch-x431-heavy-duty-module-3
Version Old New
Year Before 2019 After 2019
Price 749 usd 899 usd
Communication to the vehicle Bluetooth: Yes


Data cable: Yes

Bluetooth: Yes


Data cable: Yes

Working voltage DC 9 ~36V  
Power consumption Unknown ≤ 2W
Working temperature -20 to 70℃


-10 to 55℃
Storage temperature -30 to 80℃ Unknown
Storage humidity 10% to 80% Unknown


Launch X431 V+ Heavy Duty 2 Module User Manual.pdf

Launch X431 V+ Heavy Duty 3 Module User Manual.pdf



What is Launch X431 V+ heavy duty 3 new module:


The new module is the latest adapter released in the year 2019, used for Launch X431 V+ heavy duty 3 (abbr. hd3) scan tool.


The look:





What is Launch X431 V+ heavy duty 2 old module:


The module version 2 is old.

The look:





What’s the difference between HD 2 adapter and HD 3 adapter?


  1. Hardware design

A. HD-II Module

As the 2nd generation of heavy-duty module, it mainly functions as a VCI device

for accessing vehicle data.



LED indicators: It is defined as follows(from left to right):

  • Power Indicator: It lights up when it is powered
  • Communication LED of Tablet: It illuminates when the module is communicating with the
  • Communication LED of Vehicle: It lights up once the module is connected to a vehicle’s
  • Communication LED of PC
  • Data I/O LED

2       Data I/O port

  • Communication Port of PC
  • Diagnostic Socket: To connect the included diagnostic
  • DC-IN power jack: To connect the power


B.  HD-III Module

As the 3rd generation of heavy-duty module, it works as a vehicle communication interface device, which is used to read the vehicle data and then send it to the X-431 V+ via wireless BT/WLAN communication. The LED indicators enable you to easily identify the working status of the module.



  • LED indicators: It is defined as follows:
  • DC-IN power jack: For connecting the power
  • Diagnostic socket: For connecting the diagnostic
  • Vehicle: While communicating with the vehicle, the indicator lights up and flashes. Otherwise, it will not
  • Power: It illuminates solid red when the module is powered
  • BT: Blue indicates the module is working in wireless BT
    • I/O: It lights up when the module is connected to the diagnostic tool via data cable (Currently disabled and only reserved for subsequent function extension).
    • Wireless: It lights up when the module works as a wireless hotspot or network
  • Data I/O port: Currently disabled and only reserved for subsequent function



  1. Module specification

A. HD-II VCI module

Working temperature             -20 to 70℃
Working voltage                       DC 9 ~36V

Storage humidity                      10% to 80%
Storage temperature               -30 to 80℃


B. HD-III VCI module

Power consumption                 ≤ 2W
Working voltage                        DC 9 ~36V

Working temperature              -10 to 55℃
Communication                         Via wireless BT/WLAN or data cable


WIFI module


  • Frequency range: 2412-2472MHz
  • Transmit power: 29dBm


Wireless BT module


  • Frequency range: 2402-2480MHz
  • Transmit power: 62dBm


  1. VCI communication method

For different VCI modules, the communication methods vary.


  1. HD-II module:



  1. HD-III module:

Besides the BT communication, the HD-III VCI module comes loaded with a built-in WLAN module, which can work as a wireless hotspot or a network adaptor





  1. Vehicle connection

(For Commercial Vehicle Version)

The method used to connect the VCI module to a vehicle’s DLC depends on the vehicle’s configuration as follows:

  1. OBD II Vehicle Connection: Plug one end of the diagnostic cable into the vehicle’s DLC, and the other end into the diagnostic socket of the VCI module, and then tighten the captive


  1. Non-OBD II Vehicle Connection: For vehicles with non-OBD II diagnostic socket, a non-16pin connector (adaptor cable) is

A.  Using HD-II module

For trucks equipped with non-OBD II 16 PIN diagnostic sockets, choose any one of the following to proceed:



B.  Using HD-III module



For commercial vehicles, refer to the above connection method to proceed.

For passenger vehicles, replace the “Non-16pin connector” with “OBD I adaptor” + “non-16pin connector (for passenger vehicles)”. Other connections shall also apply.


  1. Package list


A. HD-II VCI module package list




B. HD-III VCI module package list





  6. Vehicle List 

Launch X431 HD II software/vehicle list

less heavy duty covered (42 brands)


HD III Add-on vehicle list

More heavy duty supported (up to 61 brands)

1  X431, USA FORD Diagnostic Software diesel
2  After the X431, heavy card processing system diagnostics software
3  ASTRA diagnostic software
4  Benz heavy duty diagnostic software
5  Bosch diesel diagnostic software
6  BREMACH diagnostic software
7  China heavy duty diagnostic Software
8  Cummins heavy duty diagnostic software
9  DAF diagnostic software
10  ERF diagnostic software
11  FAW Liberation diagnostic software
12  Foton Auman diagnostic software
13  FUSO diagnostic software
14  Hino diagnostic software
15  Hyundai heavy duty diagnostic software
16  Isuzu heavy duty diagnostic software
17  Iveco heavy duty diagnostic software
18  JAC heavy duty diagnostic software
19  Mack heavy duty diagnostic software
20  MAN diagnostic software
21  OBD heavy duty diagnostic software
22  SCANIA diagnostic software
23  Shangchai diagnostic software
24  Volvo heavy duty diagnostic software
25  WP diesel diagnostic software
26  X431, Airbus diagnostic software
27  X431, ALLISON transmission box diagnosis software
28  X431, Ashok Rejlander the diagnostic software
29  X431, Caterpillar heavy vehicles Diagnostic Software
30  X431, Chai heavy vehicle diagnostic software
31  X431, Chaoyang Diesel diagnostic software
32  X431, construction machinery diagnostic software
33  X431, CREDO heavy vehicle diagnostic software
34  X431, DETROIT engine diagnostic software
35  X431, Dongfeng commercial vehicle diagnostic software
36  X-431, Dongfeng Yufeng diagnostic software
37  X431, Freightliner heavy-duty truck diagnostic software
38  X431, full diesel diagnosis software
39  X431, HD ABS system diagnostic software
40  X431, hd_goldendragon diagnostic software
41  X431, hd_international vehicle diagnostic software
42  X431, HD_TATA diagnostic software
43  X431, hd_western_star vehicle diagnostic software
44  X431, heavy truck presentation software
45  X431, heavy vehicles Jiangling diagnostic software
46  X431, IRISBUS heavy vehicle diagnostic software
47  X431, IRIZAR heavy vehicle diagnostic software
48  X431, NEOPLAN heavy vehicle diagnostic software
49  X431, Renault diagnostic software for heavy vehicles
50  X431, SETRA heavy vehicle diagnostic software
51  X431, SITCAR heavy vehicle diagnostic software
52  X431, Stannic bavin diagnostic software
53  X431, Sterling heavy vehicle diagnostic software
54  X431, Sunlong bus ( SUNLONG ) diagnostic software
55  X431, sunwin bus ( SUNWIN ) diagnostic software
56  X431, UD Trucks 2F Nissan Diesel Diagnostic Software
57  X431, Yang Chai engine diagnostic software
58  X431, Zhongtong bus ( ZHONGTONG BUS ) diagnostic software
59  X431,BONLUCK diagnostic software
60  X431,HD_KENWORTH diagnostic software
61  Yuchai diagnostic software