2-3 shift selenoid circuit fault81 is the code i suspect to turn on the check engine light
Code 81:
·" When the PCM commands the 2-3 Shift Solenoid “ON”, but the voltage on Circuit
1223 remains HIGH (system voltage) or LOW (Less than 1 volt) when solenoid is
turned “OFF” for two seconds or longer. The “MIL” will not be turned on, TCC
will be inhibited, maximum line pressure will be commanded and 2nd and 3rd
gears only are available."
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