18-073-26

Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle exhibit/set SYMPTOM: one or more of the following Diagnostic Trouble Codes (DTCs):
• P0420 - Catalyst System Efficiency Below Threshold Bank 1.
• P0430 - Catalyst System Efficiency Below Threshold Bank 2.
• P0556 - Brake Booster Pressure Sensor Circuit Performance.
• P0340 - Cam Position Sensor Circuit - Bank 1 Intake.
• P0345 - Cam Position Sensor Circuit - Bank 2 Intake.
• P0365 - Cam Position Sensor Circuit - Bank 1 Exhaust.
• P0390 - Cam Position Sensor Circuit - Bank 2 Exhaust. Customers may experience one or more of the following:
• Vehicle fails emissions inspection testing.
• Fuel odor during frequent stop and re-start driving, during high ambient temps. In addition, the following software enhancement(s) is available:
• OBD calibration turned off DTC "U0463 - Fuel Level Implausible" message code and will now be detected with DTC "P0463 - Fuel Level Sensor 1 Circuit High".
• More robust trailer brake module enhancements for 3rd party aftermarket designs.
• Cam/crank diagnostic has been turned from a 1-trip to a 2-trip MIL.
• Change fuel level legislative reporting from a voltage to a percent scale. This bulletin involves reprogramming the PCM with the latest available software.