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 DPF intake temperature sensor reading was greater than 650°C (1202°F) for 5 seconds.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1A12-00	Catalyst Overheat Detection (Aftertreatment 1 diesel particulate filter intake temperature - data valid but below above operating range - least severe level)	1	Diagnosis condition	Continuously when key is ON, or engine is running
			Signal (terminal)	-
			Threshold	DPF inlet temperature > 650°C
			Diagnosis delay time	Diagnostic runs continuously when the engine is running
		2	Diagnosis condition	Continuously when key is ON, or engine is running
			Signal (terminal)	-
			Threshold	DPF inlet temperature > 800°C or DPF inlet temperature - DOC inlet temperature > 540°C
			Diagnosis delay time	Diagnostic runs continuously when the engine is running