All, Just thought I'd post a problem I'm having to see if anyone else has seen it.
03 Trailblazer, 4WD, LT w/ 6-cyl.I'm on my 5th trip to the dealer this month. Symptoms are first that I cant turn off the ignition to remove the key. It will go to the accessory position, but no further. Multiple attempts at shifting to park, etc, have no effect. The shifter goes to park, but wont unlock the key.
Once I start it back up, the transmission will only operate in 2nd or
3rd 'gear'. It will not shift between them. If I put it in drive, it starts out in 3rd and stays there. It hasnt ever happened while driving. Always seems to happen from a stop after starting. May happen more when shifting from reverse to drive. In any event, when it happens, it stays that way (never resets itself) and I have to floor the gas to get it to move. Something is going to get hurt in there but I fear it wont show up for another 30k miles....I get the follong DTCs (from my mostly generic OBD2 scanner, so there may be more). I got more but lost my list. There were a couple referring to Shift solenoid, maybe another on the Torque Converter, a couple references to Shift Solenoid A and B (if I recall) DTC P0743 TCC Enable Solenoid Circuit Electrical DTC P0758 Shift Solenoid B Electrical
The dealer indicates resetting the codes fixes the problem, it comes back in a couple days but I cant find a consistant time when it always happens (to recreate it).
The dealer is now saying they think it is my Skyfi add-on xm radio. Its wired into the circuit for lighters in the console. I told them I would humor them and not use the XM and see what happened. Drove it a few days, and it happened again. Now they want me to completely disconnect the wire (which I did) because they still think that is the problem. They have historical info that says aftermarket radios will cause this if wired into the wrong place (which I dont think the cig lighter is!) They seem to be going after the low hanging fruit and I cant blame them, but until I prove it isnt the radio, they wont do more.
Hope this helps someone down the road (I tried to put in keywords that would hit in a search) and if anyone knows anything that would relate to this, I'd appreciate a note....