Transmission fluid must be checked with the transmission at normal operating temperature. Have
the engine idle, remove dipstick, wipe it off, insert fully, then remove to get an accurate reading. If
low, have inspected for leaks.

Todays vehicles usually have a transmission fluid life of 100,000 miles before a change is required.
Low or dirty tranmsission fluid can cause slipping or GM fault codes.

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How To Check Transmission Fluid