Rough Idle and/or Hesitation During Acceleration with Cold Engine and Warm Ambient Temperatures, DTC P0300-P0306 (Engine Misfire/Cylinder 1-6 Misfire Detected) Set (Reprogram ECM)

Some customers may comment that the engine runs rough at idle and/or hesitates during acceleration when the engine is cold and the ambient temperature is 20-30°C (68-86°F). DTC P0300-P0306 (Engine Misfire/Cylinder 1-6 Misfire Detected) may also be set.

Reprogram the engine control module (ECM) with the appropriate calibration following the procedure below.

Important: Prior to reprogramming, check the battery voltage state. If the battery is not fully charged, charge the battery.

Important: Prior to reprogramming, make sure the Tech 2® is updated with the latest software.

1. Reprogram the ECM with the appropriate calibration (or later) listed below. These calibrations, or any that follow, are designed to address this concern. Refer to Service Programming System (SPS) in SI.

The new ECM calibrations are currently available to dealerships in TIS2Web. If you cannot access the calibration, call the Techline Customer Support Center (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French) and it will be provided. As always, make sure your Tech 2® is updated with the latest software version.

2. Check for any DTCs in the ECM/TCM. Clear any DTCs that are stored.
3. Use a Tech 2® scan tool to reset the electronic throttle control adaptive values (perform idle learn procedure).

3.1.	Turn the ignition ON with the engine OFF.

3.2.	Reset the adaptive values using a scan tool.

3.3.	Turn the ignition OFF for 20 seconds.

3.4.	Turn the ignition ON for 10 seconds.

3.5.	Turn the ignition OFF for 20 seconds.

3.6.	Turn the ignition ON for 10 seconds.

3.7.	Start the engine in the park/neutral position.

3.8.	Turn the ignition OFF. The procedure is complete.

For vehicles repaired under warranty, use: