Practice question

A school bus Allison transmission goes into a limited-operation 'limp' mode and the wrench/CHECK TRANS lamp is on. The technician should FIRST:

  1. Replace the torque converter
  2. Retrieve stored diagnostic trouble codes with a scan tool
  3. Replace the entire valve body
  4. Flush the cooling system

Answer: B — Retrieve stored diagnostic trouble codes with a scan tool

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