GM releases position statement on pre- and post-scans

A new GM position statement says all vehicles being assessed for collision damage repairs must be tested with a pre-scan for diagnostic trouble codes (DTCs) during the repair estimation to identify the required repairs. 

“Additionally, the vehicle must be retested (post-scan) after all repairs are complete to verify that the faults have been repaired, and new faults have not been introduced during repairs,” the statement says. “Even minor body damage or glass replacement may result in damage to one or more safety-related systems on the vehicle.” 

GM also says that any action resulting in the loss of battery-supplied voltage and disconnection of electrical circuits requires that the vehicle be subsequently tested to ensure proper electrical function. 

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

The method of correctly identifying DTCs is to use the appropriate GM techline diagnostic software, which can scan a vehicle for all DTCs in one operation, the statement says. GM does not recommend the use of other scan tools and cannot guarantee or enforce their accuracy. 

“GM vehicles, systems, and components are engineered, tested, and manufactured to help protect vehicle occupants and deliver the safety, durability, and performance expected of Chevrolet, Buick, GMC, and Cadillac vehicles,” the statement says. “GM Genuine Parts are designed, engineered, tested, and validated by GM.”

GMSi is the factory source for all diagnostic and repair procedures, wiring diagrams, and associated repair information, it says. 

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 expose vehicle owners and occupants to unnecessary risk,” the statement says. “GM collision repair information can be accessed for free on genuinegmparts.com or is available through a GMSi subscription.”

The statement provides a link to an internet-based subscription service, acdelcotds.com/subscriptions, to access GM service information, vehicle calibrations, diagnostic software, and diagnostic software updates. 

“Any damage, failure, or nonperformance arising from the installation or presence of non-GM (aftermarket, salvage, recycled, reconditioned, or other) parts, accessories, or modifications is not covered under the GM New Vehicle Limited Warranty or any GM service plans,” the statement says. “To ensure continued warranty coverage, GM requires that collision, structural, and system-dependent repairs utilize GM OE parts and GM-approved Procedures.” 

GM also recently released position statements on ADAS and aftermarket parts.

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