18-066-20

Flash: Powertrain Control Module (PCM) Updates 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 that one of the following DTCs have been set:P1D83 - Implausible Engine Oil Temperature Signal Received. P0556 - Brake Booster Pressure Sensor Circuit Performance. U0428 - Implausible Data Received From Steering Angle Sensor Module. U1504 - Implausible Message Data Length Received From Steering Angle Sensor. C0501 - Left Front Wheel Speed Sensor Range/Performance. C0507 - Right Front Wheel Speed Sensor Range/Performance. C050D - Left Rear Wheel Speed Sensor Range/Performance. C0513 - Right Rear Wheel Speed Sensor Range/Performance. Erroneously set wheel speed sensor DTCs listed above will not turn on the MIL by design but may be found during a vehicle diagnostic scan.Some customers may also experience the following:The engine being too quick to shut down when coming to a stop in Engine Stop/Start (ESS) mode. During an engine limp mode condition, the transmission remains in a fixed gear. In addition, the following software enhancements are available: Calibration update to allow the throttle body to be cycled while the engine is off, for diagnostic purposes. Calibration update for ESS to allow the engine to remain running during a brief stop.