18-050-24

"Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• P1129 - Closed Loop Fueling Not Achieved-Banks 2 Upstream.
• P0158 - O2 Sensor 2/2 Circuit High.
• P0152 - O2 Sensor 2/1 Circuit High.
• P2504 - Charging System Output High.
• P0563 - System Voltage High. Customers may also comment on one or more of the following:
• Vehicle runs rough.
• ""Service Transmission” message on due to Clutch Slip Detection with the transfer case in neutral.
• During flat tow - Transfer case mis-shift (engine running and clutch pedal up, transmission in gear). Other Software Enhancements:
• Improvements to address vehicle no starts after replacing the PCM.
• O2 Heater crack improvements.
• OBD Software changes. This bulletin involves reprogramming the PCM with the latest available software. "