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Please help with electrical issue

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Old Feb 25, 2022 | 06:50 AM
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Please help with electrical issue

09 expedition EL xlt 193k miles

Since I bought this a few weeks ago I can’t figure the problem out.. when switching to 4x4 the dash and all electrical go crazy flashing , traction control light came on, abs , and brake light along with the wrench icon also went into limp mode (3rd gear only). I checked for codes while running and nothing came up other than a pending code of U0073 but I think that’s caused by the electrical surging. If I switch back to 2wd and turn the engine off and restart it will drive okay as long as I do not switch to 4x4

Please help thank you!!
 
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Old Mar 2, 2022 | 08:41 AM
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Sounds like the smart junction block has issues. Very difficult to diagnose. Basically replace and see if replicates. Not really a diy as I believe some programming is involved.
 
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