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GM OBD Trouble Code 90

By Jim Taddei, May 1, 2009

Torque Converter Clutch Error

The ECM monitors the operation of the Torque Converter Clutch. Code 90 will set when the Torque Converter Clutch operation does not meet factory specifications.

Fault Code Description

  • 90 - Torque Converter Clutch error

Symptoms

  • Slight increase in engine RPM at freeway speeds

Common Problems

  • Faulty Torque Converter Clutch solenoid
  • Failed Torque Converter or damaged seal

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