My trans is in limp mode what sensor can make that happen.....? on 2007 Chevrolet Impala

The only code its reading is for the upstream o2sensor....

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1 answer 1 comment
Perhaps you need a differant scanner to get the transmission fault codes. Not likely that a o2 sensor would put transmission in a limp mode.
what will make that happen... Cause da check engine light is off now and no codes r showing..