I have a 2003 GMC Sonoma Crew Cab 4x4 - the 4WD will lock in on 4LO but will not lock in on 4HI. The dash switch has been changed with not results. WHen placed on a diagnostic tester - it shows no communication with the transfer case...any suggestions?
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Check for power to the front differential actuator. This actuator slides a gear in position to lock the differential to drive the front wheels. If you have power and ground to the actuator when in the 4HI position, the actuator has gone bad.The 4LO is only engaging at the transfer case, but the front wheels are still not engaged if it is not working in 4HI.
If its a 4WD there is either a push button on the dash left side of steering colomn, its marked 4hi. If manual shifter in on floor center console. Pull back on lever to second notch marker 4hi. If you are in 4lo now and can't get out. first put tranny shifter in neutral while engine running, then shift transfer case into neutral (manual push forward), push button hold 4hi and 4lo at the same time til "N" green light comes on. Then shift either into 4hi.
yea its not shifting again like before ? sounds like your transfer case solonoid has possably gone bad again .. these are a sometimes dont work item .. It is what shifts the transfer case into gear and it might be a little worn or weathered and not letting the switch kick it in gear all the way from the N position. thanks Jerry holler if you need more.
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