18-023-26

Flash: Powertrain Control Module (PCM) Updates **Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must SYMPTOM: exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs):
• P0128-00 - Thermostat Rationality.
• P24A4-00 - Particulate Filter Restriction - Soot Accumulation Too High.
• P208B-00 - Reductant Pump 1 Control Performance.** Customers may experience one or more of the following:
• Lower than expected fuel economy when vehicle is lightly loaded, operating in stop and go traffic and at lower speeds.
• Long cranking / extended starting times. **Other software enhancement included with this update:
• "Air Handling Performance Test" is now available to help troubleshoot air handling DTCs.** This bulletin involves reprogramming the PCM with the latest available software.