2021 Chevy Silverado HD - What's New, Changed, & Discontinued

General Motors has issued a Technical Service Bulletin for a wide selection of 2019/2020/2021 model year vehicles that are experiencing a no-start or long crank condition. This includes the Chevy Silverado, GMC Sierra, Tahoe, Suburban, Yukon, and more.

Technical Service Bulletin: #20-NA-218
Updated: 2/5/2021

TSB #20-NA-218 Applies To:

TSB #20-NA-218 Reported Conditions

Owners of the above affected vehicle models may experience a no-start or unusually long crank condition during start. Technicians may also find that DTC (trouble code) P12A6 may also be set after this occurs.

TSB #20-NA-218 – Cause & Fix

General Motors Engineers have determined that a software bug/anomaly in the engine control module (ECM) is responsible for these potential issues.

Owners who experience a no-start or long crank condition can contact their dealership for a software update that includes reprograming the ECM.