service 4wd msg on dash - selector switch dark
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CF Beginner
Joined: Jun 2021
Posts: 1
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service 4wd msg on dash - selector switch dark
Hi everyone , I am new here, and a proud owner of 09 silverado 2500 – excited to have this beast, drives very smooth with the 6.0. I really hope you guys can help me troubleshoot my 4wd.
I got the dash msg, and the selector switch has NO lights. Below is what I have done so far. Bought the truck with small front end damage, battery was drained for few months, truck was just sitting, in case this matters
New selector switch – did not help,
Ground wire under driver door/frame – removed cleaned, did not help
Remove the front diff actuator, bench tested it – it works
Checked 30A fuse – it is ok
Did the reset sequence – keyOn, gear N, turn selector to N wait 30sec – did not help
Getting the following codes: B0780 4wd low range indicator circuit short to battery, same msg for 2H 4L and N.
Also getting code U0102 lost communication with the transfer case control module – so I thought the TCCM was bad. I swapped with it with a new transfer case module, did not help, selector switch still dark but got a new code saying something about “Calibration not learned” Even if it is not calibrated, why is the selector switch still dark, so I thought the issue is not the TCCM, Or is it??
I am stuck – any help is much appreciated, thx!
I got the dash msg, and the selector switch has NO lights. Below is what I have done so far. Bought the truck with small front end damage, battery was drained for few months, truck was just sitting, in case this matters
New selector switch – did not help,
Ground wire under driver door/frame – removed cleaned, did not help
Remove the front diff actuator, bench tested it – it works
Checked 30A fuse – it is ok
Did the reset sequence – keyOn, gear N, turn selector to N wait 30sec – did not help
Getting the following codes: B0780 4wd low range indicator circuit short to battery, same msg for 2H 4L and N.
Also getting code U0102 lost communication with the transfer case control module – so I thought the TCCM was bad. I swapped with it with a new transfer case module, did not help, selector switch still dark but got a new code saying something about “Calibration not learned” Even if it is not calibrated, why is the selector switch still dark, so I thought the issue is not the TCCM, Or is it??
I am stuck – any help is much appreciated, thx!
CF Beginner
Joined: Dec 2024
Posts: 1
Likes: 0
Hi everyone , I am new here, and a proud owner of 09 silverado 2500 – excited to have this beast, drives very smooth with the 6.0. I really hope you guys can help me troubleshoot my 4wd.
I got the dash msg, and the selector switch has NO lights. Below is what I have done so far. Bought the truck with small front end damage, battery was drained for few months, truck was just sitting, in case this matters
New selector switch – did not help,
Ground wire under driver door/frame – removed cleaned, did not help
Remove the front diff actuator, bench tested it – it works
Checked 30A fuse – it is ok
Did the reset sequence – keyOn, gear N, turn selector to N wait 30sec – did not help
Getting the following codes: B0780 4wd low range indicator circuit short to battery, same msg for 2H 4L and N.
Also getting code U0102 lost communication with the transfer case control module – so I thought the TCCM was bad. I swapped with it with a new transfer case module, did not help, selector switch still dark but got a new code saying something about “Calibration not learned” Even if it is not calibrated, why is the selector switch still dark, so I thought the issue is not the TCCM, Or is it??
I am stuck – any help is much appreciated, thx!
I got the dash msg, and the selector switch has NO lights. Below is what I have done so far. Bought the truck with small front end damage, battery was drained for few months, truck was just sitting, in case this matters
New selector switch – did not help,
Ground wire under driver door/frame – removed cleaned, did not help
Remove the front diff actuator, bench tested it – it works
Checked 30A fuse – it is ok
Did the reset sequence – keyOn, gear N, turn selector to N wait 30sec – did not help
Getting the following codes: B0780 4wd low range indicator circuit short to battery, same msg for 2H 4L and N.
Also getting code U0102 lost communication with the transfer case control module – so I thought the TCCM was bad. I swapped with it with a new transfer case module, did not help, selector switch still dark but got a new code saying something about “Calibration not learned” Even if it is not calibrated, why is the selector switch still dark, so I thought the issue is not the TCCM, Or is it??
I am stuck – any help is much appreciated, thx!
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paintballhead03
Silverado, Sierra & Fullsize Pick-ups
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Dec 30, 2020 12:20 PM