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P28EC Powertrain

Shift Motor Position Sensor Exceeded Learning Limit

The required adaptation offset for the shift motor position sensor exceeds the calibrated learning window. Sensor or mechanism out of nominal range.

Affected components

  • Shift motor
  • Shift motor position sensor
  • Tcm

Common causes

  • High likelihood: Mechanical wear shifted end-stops
  • Medium likelihood: Sensor reference drifted

Possible symptoms

  • Check engine or transmission warning light on
  • Harsh, delayed, or missing shifts
  • Possible limp mode (locked in one gear)
  • Slipping or shuddering during gear changes

Diagnostic notes

  • The malfunction indicator lamp may illuminate
  • Reduced-power or limp mode may occur

Sources

Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.

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