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Hello, can you send more detailed information? engine size? 4x4? or 2 wd? shift hard through all gears? anything else you can add? thanks
I need to opt out and open the post to the other experts, I am unsure on this one, sorry, One should be along soon to help
Hello, i believe you are referring to the PSOM module or speedometer in the instrument cluster. if it looses vehicle speed information it can cause the trans to shift hard by putting it into a fail safe mode. Would have to verify and codes that might be stored but performing a key on engine off and key one ngine running test first along with checking trans fluid level and condition. Vehicle speed sensor code or other trans fault codes may be stored
Take note of the speedometer action, if the needle is bouncing or moving erratic when driving, the signal to the trans module part of the PCM is not working properly and will cause the trans to default to a pre-set shift point and boost line pressure which will make for hard shifts. The only repair is to replace the speedo head.