2007 Hummer H3 wont shift from second to third
#1
2007 Hummer H3 wont shift from second to third
2007 hummer h3 122k miles, wont shift from 2nd to 3rd, replaced tranny with a used one and its doing the same exact thing! if there reprogram or something that im missing? 2 tranny's doing the same exact thing? help!
#2
maybe it's an electrical issue with the harness or connector. you would have to connect a scanner that can interface with the transmission to see if she is shifting or if it can activate your shift solenoids.
#5
The 2007 H3 Auto Trans is controlled by the PCM. The PCM tells it when to shift and to what gear. You likely have an electrical issue.
Scan it for codes and post whatever codes it may have stored here.
Scan it for codes and post whatever codes it may have stored here.
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