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GM OBD Trouble Code 80

By Jim Taddei, May 1, 2009

Transmission component slipping

The ECM monitors the speed of the input and output shafts of the transmission and calculates the effective gear ratio at any given time. If the calculated gear ratio does not match the expected gear ratio for the currently selected gear code 80 will be set.

Fault Code Description

  • 80 - Transmission component slipping

Symptoms

  • Transmission shifts may become more firm in an attempt to correct the slipping condition.

Common Problems

  • Low transmission fluid level
  • Torque converter clutch not working correctly
  • Transmission slipping in one or more gears

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