Lack of Power When Accelerating

The following conditions at low speeds may be found on some 2015-2016 Colorado and Canyon models equipped with the 3.6L V6 engine (RPO LFX):

  • Chugging and/or lack of power when accelerating at speeds of 12-15 mph (19-24 km/h) in 2nd gear.
  • Chugging, lack of power, or no downshift when accelerating at speeds of 30-40 mph (48-64 km/h) in 6th gear.
  • Spark knock under light acceleration or when climbing an incline under load.

These conditions are most likely to occur while driving on a smooth road and up a slight or moderate grade when accelerating. (Fig. 8) DTC P0326 (Knock Sensor Performance Bank 1) may be set in history in the Engine Control Module (ECM).

Fig. 8

The lack of power conditions may be caused by an anomaly in the ECM and Transmission Control Module (TCM). An updated software calibration is available to address these conditions.

The ECM and TCM must be reprogrammed sequentially to the latest software calibration available to avoid other malfunctions and drive quality degradation. If both the ECM and TCM are not updated, they will be incompatible and will not perform correctly.

– Thanks to Charles Hensley

 

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