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P0820 Powertrain

Gear Lever X-Y Position Sensor Circuit

The TCM detects an out-of-range or implausible signal from the gear lever X-Y position sensor used on shift-by-wire transmissions.

Affected components

  • Gear lever position sensor
  • Shifter assembly
  • Wiring harness

Common causes

  • High likelihood: Position sensor failed
  • Medium likelihood: Shifter mechanism worn

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

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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