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Transmission does not shift

Probable cause(s)
  1. Input shaft (mainshaft) speed sensor defective
  2. Output shaft (countershaft) speed sensor defective
Notes
  • Check for a stored DTC, and check for loose connections.
  • Check the input shaft (mainshaft) speed sensor and output shaft (countershaft) speed sensor installation.
  • Inspect the sensor O-ring for wear and damage.