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P0821 Powertrain

Gear Lever X Position Sensor 1 Circuit

General electrical fault on the X-axis (left/right) position sensor 1 of an electronic gear lever. Used in stick-shift-by-wire systems where the lever is decoded into X/Y coordinates rather than discrete switches.

Affected components

  • Gear lever x sensor
  • Wiring harness

Common causes

  • High likelihood: Open or shorted wiring

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

Related codes

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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