Transfer Control Unit: Fail-Safe

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.

DTC	Vehicle condition
P1804	No impact to vehicle behavior.
P1808	4WD mode cannot be switched by operating 4WD shift switch.
P1809	4WD mode cannot be switched by operating 4WD shift switch.
P180C	4WD mode cannot be switched by operating 4WD shift switch.
P180D	4WD mode cannot be switched by operating 4WD shift switch.
P180F	4WD mode cannot be switched by operating 4WD shift switch.
P1811	4WD mode cannot be switched by operating 4WD shift switch.
P1813	When malfunction occurs due to duplicate input, the control continues according to the 4WD mode priority (2WD ↔ 4H ↔ 4LO). (For malfunction with no input, 4WD mode running at the occurrence of malfunction is maintained.)
P1814	After a malfunction is confirmed, 4WD mode can be switchable. (4WD mode temporarily not switchable only during diagnosis)
P1816	4WD mode cannot be switched by operating 4WD shift switch.
P1817	4WD mode cannot be switched by operating 4WD shift switch.
P1818	4WD mode cannot be switched by operating 4WD shift switch.
P1819	4WD mode cannot be switched by operating 4WD shift switch.
P181B	4WD mode cannot be switched by operating 4WD shift switch.
P181C	4WD mode cannot be switched by operating 4WD shift switch.
P1820	4WD mode cannot be switched by operating 4WD shift switch.
P182A	After a malfunction is confirmed, 4WD mode can be switchable. (4WD mode temporarily not switchable only during diagnosis)
P1855	4WD mode cannot be switched by operating 4WD shift switch.
P1867	No impact to vehicle behavior.
P1868	Switching to 4WD mode is possible by malfunction status. (Switching to the 2WD mode is possible.)
P1869	4WD system cannot be switched to 4WD mode by operating 4WD shift switch. (Switching to 2WD mode is possible.)
P186A	4WD system cannot be switched to 4WD mode by operating 4WD shift switch. (Switching to 2WD mode is possible.)
P186B	4WD system cannot be switched to 4WD mode by operating 4WD shift switch. (Switching to 2WD mode is possible.)
P186C	4WD mode cannot be switched by operating 4WD shift switch.
U1000	4H ↔ 4LO switching is prohibited when a malfunction occurs in communications of ECM, TCM, or BCM.
U1010	4WD mode cannot be switched by operating 4WD shift switch.