This one could be any of them. If you tackle this yourself start with the cheapest and move to the most expensive. The other way is to take this in for a diagnostic, pay them for that, and then fix it yourself knowing what it is for sure.
SOURCE: 1997 Chevy 1500 P/U 4x4 small V8. Transmission shifting issue.
you may be confusing the torque converter clutch engagement with o.d. this trans has a problem with the T.C.C. regulator valve wearing out the valve body bore. this will cause the converter clutch to engage only sometimes or not at all. this will set a P1870 code in the control module. when this code is stored in the controller, ( check engine light may or may not be on), it increases the pressure in the transmission causing the 1-2 shift to be harsh. ask a local tranny shop to scan the vehicle ( most will do this for free) if this is the problem they can either fix your valve body (sonnax parts) or replace it with an upgraded valve body. hope this helps
SOURCE: po 742 code check engine light on.transmission
p0742 is torque convertor curcuit stuck on. good-day!
2,387 views
Usually answered in minutes!
Code po894 comes up when testing with mACHINE. tRANSMISSION JERKS WHEN SHIFTING TO 2ND AND 3RD GEAR WHEN TRANSMISSION WARMS UP
×