Flash: 5.7L Diagnostic And System Improvements
This bulletin involves reprogramming of the Powertrain Control Module (PCM) with the
latest software.
A small number of customers may experience a Malfunction Indicator Lamp (MIL)
illumination. Upon further investigation the technician may find one or more of the following
Diagnostic Trouble Codes (DTCs).
? P219A - Bank 1 Air-Fuel Ratio Imbalance
? P219B - Bank 2 Air-Fuel Ratio Imbalance
? P0307 - Cylinder 7 Misfire
? P2096 - Downstream Fuel Trim System 1 Lean
? P2097 - Downstream Fuel Trim System 1 Rich
Additional Symptoms:
? Engine buck or delay feeling during low speed driving.
? Less than desired engine performance during Multiple Displacement System (MDS)
mode transitions.
