DTC P1501-7A: Hybrid/EV Battery Cooling Refrigerant Gas Fluid Leak or Seal Failure [08/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is stored if the amount of refrigerant in the air conditioning system is insufficient.

The air conditioning amplifier assembly receives the ambient temperature signal, refrigerant pressure signal, etc. from various sensors.

Based on these signals, the air conditioning amplifier assembly detects the amount of refrigerant. The A/C switch indicator is turned off and the air conditioning system is stopped if the amount of refrigerant is insufficient.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	DTC Output from	Priority	Note
P1501-7A	Hybrid/EV Battery Cooling Refrigerant Gas Fluid Leak or Seal Failure	Diagnosis condition: Ignition switch is turned to ON after 1 hour elapses after power Malfunction status: The amount of refrigerant gas is determined to be insufficient under air conditioning control Detection Time: Continuously for 3 seconds or more Trip: 2 trip detection logic	Air Conditioning Pressure Sensor Harness or connector Refrigerant pipe line Air Conditioning Pressure Sensor	Come on	Memorized	Air Conditioner	B	SAE Code: P1501

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

DTC Output from

Priority

Note

P1501-7A

Hybrid/EV Battery Cooling Refrigerant Gas Fluid Leak or Seal Failure

Diagnosis condition:

Ignition switch is turned to ON after 1 hour elapses after power

Malfunction status:

The amount of refrigerant gas is determined to be insufficient under air conditioning control

Detection Time:

Continuously for 3 seconds or more

Trip:

2 trip detection logic

Air Conditioning Pressure Sensor
Harness or connector
Refrigerant pipe line
Air Conditioning Pressure Sensor

Come on

Memorized

Air Conditioner

SAE Code:

P1501