GM OBD Trouble Code 59

By Jim Taddei, May 1, 2009

Trans Fluid Temperature sensor circuit error (high voltage)

The ECM monitors the transmission fluid temperature sensor and can adjust the transmission operation based on the fluid temperature. If the circuit is open code 59 will set.

Fault Code Description

  • 59 -Trans Fluid Temperature sensor circuit error (high voltage)


  • Check engine light may be on

Common Problems

  • Transmission temperature sensor

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