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C0387

Transfer Case Position Sensor

The transfer case control module has detected an implausible signal from the position sensor that reports the current shift position (2HI, 4HI, 4LO, neutral). Without a valid position the system cannot complete a range change.

  • Check engine light: Not always
  • Emissions related: No
  • Repair difficulty: hard

Symptoms

  • ABS warning light on
  • ESC/stability control deactivated
  • Possible reduced brake assist
  • Speedometer may behave erratically

Common causes

Ordered by how often each turns out to be the cause.

  • Transfer case position sensor failedCommon
  • Wiring or connector faultPossible
  • Encoder motor stuck between positionsLess likely

Parts involved

  • Transfer Case Position Sensor
  • Transfer Case Module
  • Encoder Motor

C0387 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.