trans will not shift on its own

35

Asked by Mar 10, 2013 at 09:05 AM about the 1994 GMC Sierra 1500 C1500 SLE Extended Cab SB

Question type: Maintenance & Repair

i just put a rebuilt trans in my truck and its doing the same thing my old trans did,it won't
shift at all if i put it in overdrive but if i start out in 1st gear then i can shift in to 2nd but
thats it

2 Answers

16,255

the Vehicle speed sensor may be defective or the throttle position sensor. They may be bad or the wiring harness may be damaged and the signal isnt getting to the computer or trans. 94 was the 1st year for the electronic 4l60e, it needs the computer and specific sensors that take place of normally hydraulic controls. Does your speedo work?

2 out of 2 people think this is helpful.
35

yes the speedo works and the engine light goes on and off from time to time and now when i use the scanner on it, it says operator error. but the engine seems to run fine

1 out of 1 people think this is helpful.

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