DTC Detection Logic

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

DTC

Item

(CONSULT screen terms)

A/T CHECK indicator lamp judgment flicker

Diagnostic item is detected when...

Possible cause

P1774

L C BRAKE SOLENOID

7th

TCM detects an improper voltage drop when it tries to operate the solenoid valve.
Condition of ATF pressure switch 2 is different from monitor value, and relation between gear position and actual gear ratio is irregular.

Harness or connectors
(Solenoid and switch circuit is open or shorted.)
Low coast brake solenoid valve
ATF pressure switch 2