DTC Detection Logic

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

The Engine Control Module (ECM) detected a loss of vehicle speed when other engine operating conditions indicated that the vehicle should be in motion. This fault code can also become active if the calculated gear ratio and actual gear ratio do not agree while the vehicle is in motion

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0501-00	VEHICLE_SPEED (Vehicle Speed Sensor "A" Range/Performance)	1	Diagnosis condition	Vehicle is in motion
			Signal (terminal)	(-)
			Threshold	At ignition OFF vehicle speed is > 158.449 mph
			Diagnosis delay time	Diagnostic runs continuously when the engine is running
		2	Diagnosis condition	Vehicle is in motion
			Signal (terminal)	(-)
			Threshold	Actual gear ratio < 0.504
			Diagnosis delay time	Diagnostic runs continuously when the engine is running
		3	Diagnosis condition	Vehicle is in motion
			Signal (terminal)	(-)
			Threshold	Difference between min and max vehicle speeds attained within a time window is less than 0.621 mph, while pedal position has changed by 20% at least 50 times in the time window
			Diagnosis delay time	Diagnostic runs continuously when the engine is running
		4	Diagnosis condition	Vehicle is in motion
			Signal (terminal)	(-)
			Threshold	Vehicle speed = 0 and idle validation counter is ≥ 10 and boost transition counter ≥ 60 where idle validation counter is incremented on idle transitions from idle to non-idle, and boost transition counter is incremented when boost goes above 20 kPa for 5 seconds. After engine has been running for at least 5 minutes, then at any instant of time when engine torque is > 116 Nm and unfiltered vehicle speed = 0 and filtered vehicle speed is > 9.942 mph
			Diagnosis delay time	Diagnostic runs continuously when the engine is running