What does code 42 mean IN 2001 SIENNA?

In a 2001 Toyota Sienna, a code 42 typically refers to a malfunction in the vehicle’s engine control system, specifically related to the vehicle’s speed sensor or vehicle speed signal. This code can indicate issues with how the vehicle calculates speed, which might affect transmission shifting and overall performance. It's advisable to have the vehicle diagnosed by a professional to determine the exact cause and necessary repairs.