Question about RTO Automatic Transmission And Engine Oil Pressure Tester
Change transmition filter and oil
Hello, sounds like this will not be a homeowner capable fix as there are several possible reasons the trans is not shifting from first to second gear. In that transmission, Mechanically, 2nd gear is an intermediate band operated by a servo which pressures are controlled by shift solenoids. So basic daignosis would be to see if the solenoids are active before pulling the trans to take it apart for inspection of some key internal components like the condition of the band and the drum it holds as well as proper clutch engagement in the packs. Like I said, this is not not a do it at home job without GM automatic transmission experience. But before a teardown a bi-directional scan tool and a stethescope should be used to see if solenoids are at least active with the key on and a scan tool commanding the solenoids and listening to the case near the valve body to see if solenoid clicks can be heard before tearing into the unit. And another diag before teardown would be to drive the vehicle with the scan tool in transmission solenoid parameters visible to see if the PCM is commanding the solenoids to change and shift. Like I said, not a low tech diag. I was a Master GM tech and Shop Foreman for over 30 years building transmissions.
Posted on Dec 26, 2014
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Posted on Jan 02, 2017
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