General Motors has released a service update for units of the 2024 Chevy Silverado HD equipped with the 6.6L V8 L5P turbodiesel Duramax diesel engine. The update targets a specific issue with the Selective Catalyst Reduction (SCR) system, considered an essential component of the vehicle’s emission control technology. The service update will be applied to vehicles in dealer inventory and customer vehicles that return to the dealership.
The new service update is tagged as N242438501, and was released in April of the 2024 calendar year. The service update only applies to the 2024 model year for the Chevy Silverado 2500 HD and 3500 HD, and only those units equipped with the 6.6L V8 L5P turbodiesel Duramax diesel engine. It’s unclear exactly how many units are affected by this particular Service Update.
The problem lies within the Engine Control Module (ECM) software, which may fail to correctly diagnose or may not set Diagnostic Trouble Codes (DTCs) for the Selective Catalyst Reduction (SCR or NOx) catalyst system. This failure could prevent the Malfunction Indicator Light (also known as the Check Engine Light) from alerting drivers to SCR-related issues.
To fix the issue, GM has directed dealerships to reprogram both the ECM and the Transmission Control Module (TCM). No replacement parts are required for this fix, suggesting that the issue can be resolved entirely through software.
As a reminder, the 6.6L V8 L5P turbodiesel Duramax diesel engine found under the hood of the 2024 Chevy Silverado HD is rated at 470 horsepower at 2,800 rpm and 975 pound-feet of torque at 1,600 rpm. Output is routed through the GM 10-speed automatic transmission, with either rear-wheel drive or four-wheel drive available to put the power down. A more capable variant of the GM T1 platform provides the underpinnings, while production takes place at the GM Flint plant in Michigan and the GM Oshawa plant in Canada.
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I always wonder about "software updates". Had an SRX with the 3.6 that had timing chain issues. They were replaced twice and finally had a "software update" that told the computer to ignore the cam timing so as not to throw a DTC.
CEL is actually Check Engine Light, not Chevy Engine Light. But thanks for the chuckle.
Thanks for pointing out that typo, the post has been updated.