Four Wheel Drive (4WD) Control Module Diagnostic Trouble Code (DTC) Chart

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

DTC	Description	Source	Action
B1317	Battery Voltage High	4WD Control Module	CHECK the battery and charging system for faults. REFER to CHARGING SYSTEM - GENERAL INFORMATION article. CLEAR the DTC. REPEAT the self-test.
B1318	Battery Voltage Low	4WD Control Module	CHECK the battery and charging system for faults. REFER to CHARGING SYSTEM - GENERAL INFORMATION article. CLEAR the DTC. REPEAT the self-test.
B1342	ECU is Defective	4WD Control Module	CLEAR the DTC. REPEAT the self-test. If DTC B1342 is retrieved, INSTALL a 4WD control module (integral to the PCM). REFER to ELECTRONIC ENGINE CONTROLS article. REPEAT the self-test.
P1812	Transmission 4-Wheel Drive Mode Select Circuit Failure	4WD Control Module	Go to Pinpoint Test T .
P1815	Transmission 4-Wheel Drive Mode Select Short Circuit to Ground	4WD Control Module	Go to Pinpoint Test T .
P1824	Transmission 4-Wheel Drive Clutch Relay Circuit Failure	4WD Control Module	Go to Pinpoint Test T .
P1826	Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Battery	4WD Control Module	Go to Pinpoint Test T .
P1827	Transmission 4-Wheel Drive Low Clutch Relay Short Circuit to Ground	4WD Control Module	Go to Pinpoint Test T .
U1900	CAN Communication BUS Fault - Received Error	4WD Control Module	DIAGNOSE the module communication network. REFER to MODULE COMMUNICATIONS NETWORK article.
U2023	Fault Received From External Node	4WD Control Module	DIAGNOSE the module communication network. REFER to MODULE COMMUNICATIONS NETWORK article.
U2050	No Application Present	4WD Control Module	Method 3 programming fault. REFER to MODULE COMMUNICATIONS NETWORK article for 4WD control module (PCM) programming information.