18-046-15

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.