Owners of a 2023 Chevy Silverado HD or GMC Sierra HD with an L5P 6.6L Duramax Turbo Diesel may have their trucks randomly stall and/or illuminate a check engine light. Here’s why and what they can do to fix it.
Duramax Stalling Issue – Vehicles Affected
- 2023 Chevrolet Silverado 2500 HD / 3500 HD
- 2023 GMC Sierra 2500 HD / 3500 HD
- Equipped with a (L5P) 6.6L Duramax Diesel Engine
- Produced from Start of Production Until August 1st, 2023
Duramax Stalling Issue – Conditions You May Notice
Some owners may comment on one or more of the following conditions:
• MIL illuminated
• Engine stalling
Some technicians may find one or more of the following DTCs set in the Engine Control
Module (ECM):
• P0606
• P060C
• P2463
• P2459
Some technicians may also find for a vehicle that stalled with P060C, additional codes:
• P0090
• P0092
• P00C9
• P12A6
• P2294
• P2296
Duramax Stalling Issue – The cause
This engine stalling and check engine light issue is caused by a software anomaly in the ECM and TSM.
Duramax Stalling Issue – Additional Information and Fix
This issue is detailed in Technical Service Bulletin (TSB) 23-NA-152. If you think you have this specific issue, please visit your dealer to have your truck serviced.
Your dealership will reprogram your ECM/TSM (Engine Control Module / Transmission Control Module) with new software to eliminate the stalling and check engine light. The tech will also perform a barometric pressure reset. This fix should be covered under warranty.
Zane Merva is the Executive Editor of GM-Trucks.com and the President of the New England Motor Press Association (NEMPA). A veteran automotive journalist with over 26 years of experience, Zane is a designated ‘Car Talk’ Expert and has been a contributor to The Boston Globe. He possesses a unique evaluative perspective, having road-tested more than 2,000 vehicles across every major manufacturer. While he is a recognized authority on General Motors truck platforms—including the Silverado, Sierra, and Colorado—his expertise is grounded in decades of deep competitive analysis that few in the industry can match. His commentary has been featured by major OEMs and media outlets, including Hyundai and PR Newswire