Ford P1812: 4x4 Mode Select Circuit Failure

Is your scanner showing Ford P1812?
No worries. We'll show you what it means and how to deal with it.

Presented by

Randy Worner

00:00/00:00

Ford P1812: 4x4 Mode Select Circuit Failure

OVERVIEW

Severity

High

DIY Difficulty Level

Intermediate

Repair Cost

$80-$350

Can I Still Drive?

Yes (Short-term only)

What Does The Ford P1812 Code Mean?

Open circuit or short to battery sensed by 4×4 control module or correct mode not selected for self-test.

Note: The Mode Select Switch (MSS) communicates the operator’s choice to the 4X4 control module. The 4X4 control module then controls the transfer case clutch and transfer case shift motor as necessary. If the vehicle is not responding to the operator’s intentions, systematically check the necessary inputs and outputs of the 4X4 control module, components of the transfer case and half shafts. Check all circuits for opens and shorts to power or ground.