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I just put a rebuild tranny in my Honda & now im getting a code p1738 & p0740 on 1998 Honda Accord

What can i do now

did you have it done? if so return for warranty work. was it a used trans?
Rebuild tranny but im really not trusting the mechanic
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2 more answers
For P1738, possible 2nd clutch pressure switch failure , or it's unplugged , or wire damage. Also could be TCM , but if TCM wasn't bad prior to rebuild I'd go there last. P0740 is torque converter clutch circuit problem . Is this a trans shop that did the rebuild , and how long ago (time/miles) was it rebuilt?
possible incorrect grade of fluid used. it would throw off sensors and effect performance. also agree with ziptie.