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Dan, Technician
Category: Ford
Satisfied Customers: 23949
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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2004 explorer transfer case code U2023

Resolved Question:

2004 explorer transfer case code U2023
Submitted: 5 years ago.
Category: Ford
Expert:  Dan replied 5 years ago.
Welcome to JustAnswer, my name is XXXXX XXXXX I'm here to help get your problem resolved. Ask follow up questions, thanks. U2023 is defined as "Fault Retrieved From External Node". What this means is that the 4WD shift control module cannot properly function due to an issue of PCM or ABS function. This code is usaully caused by a failing differential speed sensor or wheel speed sensor..You can test sensors by seeing if they put out AC voltage while wheels/differential is spinning and if not replace sensor as needed...Easiest way to find out is have vehicle connected to scantool that can moniter sensors while driving. Let me know if you have questions, thanks.
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