Safe Repairs -GM’s Position Statement on Pre- and Post-Repair Scans

| March 15, 2017

Little things mean a lot. In the world of collision repair, they can mean the difference between a motorist walking away from an accident or a disaster.

Take the network of sensors and electronics controlling vital vehicle safety and performance systems, overlook damage to just one of these many critical pieces of the automated shield protecting a vehicle and you could be potentially sending a customer out your doors and into serious trouble.

GM recently stepped up to help prevent such catastrophes with a position statement on the necessity of testing for Diagnostic Trouble Codes before and after a repair. Among GM’s declarations: These scans must be conducted using GM approved diagnostic software and tools, and Genuine GM Parts, to help ensure a proper, safe repair.

The full statement is included below:

Service Information – Position Statement:  Pre- and Post-Scan of Collision Vehicles – October 2016

General Motors takes the position that all vehicles being assessed for collision damage repairs must be tested for Diagnostic Trouble Codes (DTCs) during the repair estimation in order to help identify the required repairs. Additionally, the vehicle must be retested after all, repairs are complete in order to help verify that the faults have been repaired and new faults have not been introduced during the course of repairs.

Even minor body damage or glass replacement may result in damage to one or more safety-related systems on the vehicle. Any action that results in loss of battery-supplied voltage and disconnection of electrical circuits requires that the vehicle is subsequently tested to help ensure proper electrical function.

Many safety and security-related components, sensors and Electronic Control Units (ECUs) require calibration and/or learn when replaced. These systems must be repaired according to the corresponding GM repair procedures in Service Information (GMSi).

< End of Position Statement >

Technology Supported Diagnostic Aids

General Motors states that the method to correctly identify vehicle diagnostic trouble codes (DTCs) is by using the appropriate GM diagnostic software: GDS2 or Tech 2/Tech2Win, each of which can scan a vehicle for all DTCs in one operation.

GM diagnostic software is supported by one of the GM approved diagnostic scan tools (MDI or a J2534 device). GM does not recommend the use of other scan tools and cannot guarantee their accuracy. For a list of vehicles covered by these applications, refer to the GM technical document titled Vehicles Supported by GDS2 or Tech2/Tech2Win.

GMSi is the factory source for all diagnostic and repair procedures, wiring diagrams and associated repair information. GM Service Programming System (SPS) is the ECU programming application that provides calibration updates and guided learn procedures where required.  Any repairs performed without using Genuine GM Parts and not following published GM collision repair procedures may result in erroneous DTCs and can expose vehicle owners and occupants to unnecessary risk. GM collision repair information can be accessed for free on or is available through a GMSi subscription.

How to obtain GM diagnostic and flash programming software and service information in North America.

TIS2Web is the Internet-based subscription service for GM service information, vehicle calibrations, GDS2 diagnostic software, and Tech2 diagnostic software updates. Subscription options and more information on GMSi, SPS and TIS2Web can be found at

Still, have questions? Address them at or ask your Genuine GM Parts dealer.

Make this position statement and others like it part of your repair plans, documentation library, and training. These small steps can make a big difference in the health of your business and well-being of your customers.

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Category: GM Parts News, Industry News, OE Parts Update