B1423
Book Code B1423 Inspection
Automotive Climate Control
High Impact Failure
Code B1423 - Pressure Sensor Circuit / Refrigerant Abnormal (Toyota / Lexus)
Code B1423 indicates that refrigerant pressure is outside safe operating thresholds (either critically low due to freon leak, or dangerously high due to condenser blockage or overcharge).
Safe to Drive? ✅ Yes, Safe
Estimated Repair Cost 180 - 850 SAR
Common Makes Toyota, Lexus
System Category pressure
Symptoms of Trouble Code B1423:
- ⚠️ A/C blows ambient/hot air with zero cooling
- ⚠️ Compressor does not engage
- ⚠️ DTC registered in HVAC control module
Common Causes Behind Code B1423:
- 🔍 Complete loss of refrigerant charge due to leak in evaporator, condenser, or hoses
- 🔍 Overcharged refrigerant exceeding 3.14 MPa safety limit
- 🔍 Defective high-pressure line transducer / pressure sensor
- 🔍 Broken wiring harness or corroded connector pin
Diagnostic Procedure Recommended by Auto Save Technicians:
- 1 Connect A/C manifold pressure gauges to check static system pressure
- 2 If static pressure is zero, perform nitrogen laser leak test before refilling
- 3 If pressure is normal, measure sensor reference voltage and signal (0.5 - 4.5V)
Specialist Recommendation:
Request Parts & Repair Quote
Never recharge freon blindly without inspecting leak locations first.
Associated Components: A/C Pressure Transducer Condenser Evaporator Core Refrigerant Hoses
Frequently Asked Questions: Code B1423
Does replacing the sensor always fix code B1423?
In 80% of cases, the sensor is working correctly and reporting zero pressure because freon leaked out.