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Discussion Starter · #1 ·
Hello all, first time here.
My daughter's 2003 truck is throwing the following codes:

PO300
U1255
U1000
C0300
CO3005
CO306
CO321
CO327
CO359
CO374
CO379

I'm not a mechanic, I know how to do basic maintenance but I've been in IT for years and the code structure leads me to think that it's a control module issue but not sure which one and would like to get your thoughts?

thanks

Paul
 

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1,852 Posts
1. Check all the fuses
2. Make sure the encoder motor is plugged in on the transfer case
3. Clean the ground wire on the left front body mount
4. Unplug the transfer case control module and grease the pins with di-electric grease and work the connector in and out a few times.
 
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