A diagnostic scan can retrieve stored fault codes and, with suitable equipment, display information such as sensor readings, commanded gears, and operating temperatures. These details help identify the conditions the vehicle's computers have detected.
A code does not automatically identify a failed part, and the absence of codes does not rule out a mechanical problem. Additional checks may include wiring tests, fluid inspection, and evaluation of how the vehicle operates.
Certified Transmission in Bellevue uses the findings to guide diagnosis rather than treating a code reading as a complete repair recommendation.