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

L5P 6.6L Duramax Turbocharged Diesel Engine
L5P 6.6L Duramax Turbocharged Diesel Engine

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.