Car Information:
Hyundai
Year: 2002
Engine Size: 4 cycle
Trans: Automatic

Issue / Question:
Periodically, the transmission or engine stutters. Then the transmission stays in 3rd gear and will not go into drive. The check engine light also comes on.

As soon as I stop and turn car off, the transmission is fine and check engine light goes off. The car shifts normally again. At that point, the transmission shifts fine and there is no slippage.

I recently had transmission coolant lines replaced and the mechanic added transmission fluid. He road tested the car and said the transmission was fine then.

A friend suggested that perhaps dirt in fluid was responsible.

What advice do you have?

Answer:
Something is causing the transmission to go into limp mode. The best place to start is with a scan to identify the codes causing the check engine light to come on. I wouldn’t worry too much about it until its scanned it may just be a position or speed sensor if it seems to operate properly when it does work.

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