DTC Detection Logic

WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If DTC P0122 or P0123 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to DTC Logic .

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0122

TP SEN 2/CIRC-B1

(Throttle position sensor 2 circuit low input)

An excessively low voltage from the TP sensor 2 is sent to ECM.

Harness or connectors
(TP sensor 2 circuit is open or shorted.)
Electric throttle control actuator
(TP sensor 2)

P0123

TP SEN 2/CIRC-B1

(Throttle position sensor 2 circuit high input)

An excessively high voltage from the TP sensor 2 is sent to ECM.