21-020-26

Flash: Transmission Control Module (TCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• P2096-00 - Downstream Fuel Trim System 1 Lean.
• P2097-00 - Downstream Fuel Trim System 1 Rich.
• P2098-00 - Downstream Fuel Trim System 2 Lean.
• P2099-00 - Downstream Fuel Trim System 2 Rich.
• P068A-00 - ECM Power De-Energized Performance-Too Early. NOTE: The above DTCs are being falsely set due to lack of robustness to the diagnostic monitor. This bulletin involves inspecting and possibly reprogramming the TCM with the latest available software.