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4x4 problems gm dtc c0321-06

  • Duramaxlbz
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09 Nov 2019 07:04 #34864 by Duramaxlbz
4x4 problems gm dtc c0321-06 was created by Duramaxlbz
Working on a 2007 chevy tahoe with 5.3 dtc c3021-06. Whats the best way to diagnose this owner tried new tccm and encoder motor at one time. So now it seems encoder is old and tccm is new. Still has code. No 4x4 also I scanned and switch is responding. This has a np8 rpo code for transfer which is odd because it has a circle switch for selecting 4x4 options. Anyway this 07 has 05 brakes and was built in 12/05 but, has the newer body. Just looking for best way to go about this or most common issues...
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09 Nov 2019 08:08 #34866 by jreardon
Replied by jreardon on topic 4x4 problems gm dtc c0321-06

The transfer case lock solenoid is released by being energized. This is accomplished by grounding the lock solenoid control circuit during gears shifts, and in the AUTO 4WD mode.


Does this wire change state when going into and out of these modes? Do you have ground there during gear shifts?



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File Name: c0321.pdf
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File Name: schematics.pdf
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File Name: transferca...cuit.pdf
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File Name: transferca...iews.pdf
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  • Cheryl
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09 Nov 2019 08:42 #34870 by Cheryl
Replied by Cheryl on topic 4x4 problems gm dtc c0321-06
Can you post code setting criteria? It says lock solenoid circuit short to ground? Is the wire shorted to ground between solenoid and tccm?

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09 Nov 2019 08:47 - 09 Nov 2019 08:48 #34872 by jreardon
Replied by jreardon on topic 4x4 problems gm dtc c0321-06
It's in attachments. Short is certainly a possible cause. plus "This DTC detects an open lock solenoid coil, open motor lock control circuit, or an open motor lock feed circuit."
Last edit: 09 Nov 2019 08:48 by jreardon.

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  • Duramaxlbz
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09 Nov 2019 10:40 #34873 by Duramaxlbz
Replied by Duramaxlbz on topic 4x4 problems gm dtc c0321-06
I'll try that on monday right now owner has car for hunting

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09 Nov 2019 10:41 #34874 by Duramaxlbz
Replied by Duramaxlbz on topic 4x4 problems gm dtc c0321-06
That's what I need to test and help with.

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