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sprinkles08, ASE Certified Technician
Category: Ford
Satisfied Customers: 22684
Experience:  ASE Master and Advanced level certified. Factory trained with 15 years dealership experience
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4x4 code p1812 tried new switch and new 4x4 module light

Customer Question

4x4 code p1812 tried new switch and new 4x4 module light still flashes and code still there
Submitted: 1 year ago.
Category: Ford
Expert:  sprinkles08 replied 1 year ago.

Hello and welcome to JustAnswer!

This code is for the transfer case mode select switch circuit. There are only a few causes for this and assuming the replacement parts are good, the only thing left is wiring. This code sets when voltage on the switch signal circuit is high. This could be a short to power on the signal wire, an open ground to the switch, or an open signal wire. Make sure the switch ground is good, if ok then move to testing the white/brown wire for a short to power and for continuity between the switch and module.