I need a little help concerning a 1999 E320 with approximately 57k miles. The check engine light is on and the car is in limp home mode. The code was read at AutoZone and he got a P0715 code. I'm not sure if he tested for more. A few questions
a. What does this code in this application represent?
b. Can AutoZone reader be accurate?
c. Would the tranny indicating a malfunction make the CEL illuminate?
Thanks for comments and assistance in this matter.

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Jim