Flash: Powertrain Diagnostic And System Enhancements
This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest
available software.
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) set in the PCM:
· **U0140 - Lost Communication With Body Control Module (BCM) (2012 MY only).
· P0116 - Engine Coolant Temperature Sensor Performance (2012 MY only).**
· P2173 - High Airflow/Vacuum Leak Detected (Slow Accumulation).
The following transmission enhancements are also included in this software update:
· 3-2 downshift clunk or bump (2012 Sales Code DG2 only).
· 4-3 downshift clunk or bump (2012 Sales Code DG2 only).
· 1-2 upshift clunk or bump (2012 Sales Code DG2 only).
· 4-5 upshift clunk or bump (2012 Sales Code DG2 only).
· 5-6 upshift clunk or bump (2012 Sales Code DG2 only).
· RPM Fluctuating or jerking feeling between 96 KPH (60 MPH) to 112 KPH (70 MPH)
while operating in cruise control.
