GMC Troubleshooting Questions? Ask a Mechanic for Answers
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The 12v wire to the trans solenoids should be red. (see diagram).
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No Movement When Transmission is Shifted to Drive or Third - Normal Operation When Shifted to Second, First or Reverse
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With the key on, do you have voltage at the TRANS fuse in the fuse panel?
TRANS fuse is at bottom on left side (see attached diagram) Check for voltage at this fuse with the key on.
And do you have voltage at the pink/black wire at transmission connector with key on?
You should have two power wires. The pink may be discolored and look like orange. Do you have voltage on these two wires with the key on?
So with the shifter in Drive, does the transmission seem to stay stuck in 2nd gear?
When you tested voltage at the Trans fuse, was the connector plugged in at the transmission?
Make sure all connectors are plugged in, then recheck voltage at the Trans fuse with engine running.
When you replaced the shift solenoids, did you see any breaks in the internal wiring harness?
Any codes in the computer?
Sounds like a possible bad ECM or mechanical failure within the transmission, but some more diagnosis with an ohmmeter would need to be done to know for sure.