1994 K1500 5.7L, 10k on rebuild transmission
I’m getting the dreaded code 72 VSS output speed loss with rough shifting mostly out of 2nd, it requires high RPMs to shift when it does. I have a functioning speedometer and tachometer. I have no problem with a Brake or ABS light on the instrument cluster. I’ve replaced the VSS and checked the VSS buffer. They all check out to be good. I’ve looked at the wiring including grounds and I could not find anything wrong.
I’ve looked at various diagnostic aids and performed the steps outlined and still no luck. I’ve even replaced the ECM with no luck.
I need to mention that I also get the following codes from time to time.
69 TCC STUCK ON
72 OUTPUT SPEED L0SS
73 FORCE MOTOR CURRENT
79 TRANSMISSION HOT
81 TRANS SOL B FAILUREN
Any ideas on what else I could look at?
I’m getting the dreaded code 72 VSS output speed loss with rough shifting mostly out of 2nd, it requires high RPMs to shift when it does. I have a functioning speedometer and tachometer. I have no problem with a Brake or ABS light on the instrument cluster. I’ve replaced the VSS and checked the VSS buffer. They all check out to be good. I’ve looked at the wiring including grounds and I could not find anything wrong.
I’ve looked at various diagnostic aids and performed the steps outlined and still no luck. I’ve even replaced the ECM with no luck.
I need to mention that I also get the following codes from time to time.
69 TCC STUCK ON
72 OUTPUT SPEED L0SS
73 FORCE MOTOR CURRENT
79 TRANSMISSION HOT
81 TRANS SOL B FAILUREN
Any ideas on what else I could look at?