DTC B1423: Open in Pressure Sensor Circuit / Abnormal Refrigerant Pressure [08/2020 - ]: Description

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This DTC is stored if refrigerant pressure on the high pressure side is extremely low (196 kPa (2.0 kgf/cm² , 28 psi)) or less) or extremely high (2812 kPa (28.7 kgf/cm² , 408 psi)) or more). The air conditioner pressure sensor, which is installed to the high pressure side pipe to detect refrigerant pressure, sends a refrigerant pressure signal to the air conditioning amplifier assembly. The air conditioning amplifier assembly converts this signal to a pressure value according to the sensor characteristics and uses it to control the compressor.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1423	Pressure Sensor Circuit	Diagnosis condition: Ignition switch ON Malfunction Status: Refrigerant pressure signal malfunction Detection time: Continuously for 4 seconds or more (Present malfunction)	Air conditioner pressure sensor Harness or connector Air conditioning system (leaks, blocked) Cooler expansion valve (blocked, stuck) Cooler condenser assembly (blocked, deterioration of cooling capacity due to dirt) Cooler dryer (moisture in the refrigerant cycle cannot be absorbed) Air conditioning amplifier assembly Cooling fan system (cooler condenser assembly cannot be cooled down) Refrigerant pressure (overcharged, lack)	-