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Re: 96 tahoe transmission issues
IT IS ELECTRICAL but
Codes do not say sensors bad they say check sensors and wiring circuit.
1860 is PWM solenoid or wiring circuit problem.
1864 is tcc solenoid or wiring circuit
1885 is 3/2 solenoid circuit or solenoid..
If speedo or speed sensor quiting will cause transmission to go into limp mode
also PWM solenoid or wiring circuit.
Read out and test them speed sensors on scanner.
If all three codes come right back check the fuse and power feeds and wiring and plugin to transmission solenoids.
MT
Recheck codes and see what has come back.
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Remember proper testing gives us the answer to many problems.
MT
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