The 4r70w trans only has two shift solenoids, plus a tcc solenoid and an epc solenoid. Not sure why your scanner shows a third shift solenoid? Anyway it sounds like the shift solenoids are operating correctly. The code p1500 defenition is
Diagnostic Trouble Code (DTC) P1500 indicates the VSS input signal was intermittent.
Intermittent VSS connections.
Intermittent open in VSS harness circuit(s).
Intermittent short in VSS harness circuit(s).
Seeing as your truck is a 4x4, there is a tsb about a loose speedometer drive gear causing vss codes. If you take the vss out of the transfer case extension housing and reach in with one finger you should be able to feel the drive gear. It should be tight on the shaft, if it loose then that may be why the code is being set.
I think you may have more than one problem that just surfaced at the same time. The p1500 code set by the erratic vss signal, usually causes erratic shifts but not a no shift condition. There is also a tsb for your year truck that pertains to an updated 2-3 shift accumulator. The original 2-3 accumulator did not fit properly in the bore on the trans, allowing fluid pressure to leak past the large seal surface. The updated part has a tighter fit.
How is the trans fluid, its not burnt is it? When you had the pan down to change the shift solenoids, was there any debris in the pan? Is your trans original or has it been replaced before?
Last edited by Xplorer; 09-21-2003 at 06:05 PM.