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2007 FJ 4WD my check engine lights go on for a few hours while Im driving normal. Then they turn off. I noticed that during the time the check engine lights are on , my transmission performance shifts to 4D Even though it still shows being on regular drive.
When I try and shift back and forth from D to 4D there is no change in rpms or performance. It stays on 4D performance.

any ideas anyone?
 

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Use an OBDII code reader to see if there are any stored or pending codes.

Certain transmission problems can cause the transmission to lock itself out of 5th gear, but I don't know if that will trigger the CEL.

Do the basic no-brainer stuff first, check transmission fluid level when warm.

Next, get an OBDII reader that you can take with you and immediately do a code check while the CEL is ON.
 
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