Autel IM508 IM608 Calculate 2021 GM Security Verification Code Guide

How to get the body module security verification code when programming 2021 GM smart keys via Autel MaxiIM tablets? This is an instruction to guide on calculation procedure for Autel IM508, IM608 & IM608 Pro key programmer. Workable for 2020-2021 GM Cadillac, GMC, Chevy, Buick add key & all key lost. Detailed car list please refer to below:

GM Vehicle Coverage

Cadillac CT5 2020-2021 Smart Key
Cadillac CT4 2020-2021 Smart Key
GMC Yukon 2021 Smart Key
GMC Sierra 2021 Smart Key
Cadillac Escalade 2021 Smart Key
Chevrolet Tahoe 2021 Smart Key
Chevrolet Silverado 2021 Smart Key
Chevrolet Suburban 2021 Smart Key
GMC Denali 2021 Smart Key
Buick Envision 2020- Smart Key /New type only
Chevrolet Corvette 2021 Smart Key /New type only
Buick Envision 2021 Smart Key

What’s Autel GM Security Verification Code Calculation?
It was reported that 24-digit security verification code calculation service of GM vehicles 2020-2021 CANFD protocol was not responded to in time since July 2021. Whereupon, Autel team had blocked the menu.

Mainly due to the strong requests from users, Autel decided to re-open this function. Now Autel after-sales team can help to calculate the 24-digit security verification code when immo programming. The calculation tool can only be placed in China and needs to remotely control Autel China server to do calculations via Teamviewer.

Software Version Required
GM IMMO program V3.61 or higher

GM IMMO Calculation

  1. Go to IMMO menu to identify car model >> Keyless system(CANFD) >> Add smart key/ All smart key lost.


  1. Ensure the VCI is connected to the CANFD adapter, press START/STOP button once.


  1. Send the ECM application code & VIN to Autel after-sales to obtain ECM security verification code.

Note: DO NOT exit this interface during the query.


  1. Enter the ECM security verification code which is getting from Autel after-sales. Press “OK”.


  1. Send the BCM application code & VIN to Autel after-sales again.


  1. Enter the ECM security verification code again.


  1. Finally, close the drive door & press OK. IM508/IM608 tablet will configure system & process add key/all key lost.


Read also
Autel IM508/ IM608 add 2017-2021 Buick Envision Key Success

More any questions about Autel Automotive Key Tools, feel free to contact us.

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