96fan Posted September 23, 2022 Report Share Posted September 23, 2022 P1870 cel code. I had read it usually has to do with the solenoids in the valve body. I thought I had read it could be changed fairly easy after dropping trans pan. So I bought a reman'ed sonnax upgraded valve body and of course after purchase I am now worried I misread/forgot and I'm looking for info for how big of a job it is to replace. Rough description of job and hours to complete a valve body swap is what I'm after. Or if I'm better off just returning the part to rock auto. Also if I'm way off course on that code let me know. Issue is car seems to pulse similar to a cylinder misfire when in 4th gear low rpm under a load. Apply throttle, downshift to 3rd and usually 3k rpms or more and no problem and it downshifts smooth. But to try to hold 4th at lower rpms under a load is has that issue. Thanks in advance for helping my stupidity. Quote Link to comment Share on other sites More sharing options...
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