OBD code B0423 indicates an issue with the Passenger Air Temperature Actuator in the HVAC system.
Symptoms include the Engine Light being ON.
The cause is often a faulty actuator or related wiring issues.
While not a critical problem, it can affect climate control.
To fix, inspect the actuator, wiring harness, and connectors for any damage or poor connections.
| Repair Importance Level | 3.33 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
Symptoms of the b0423 OBD Code
The vehicle displays a fault code B0423 related to the HVAC system.
- Symptoms: Service Engine Soon Warning Light ON.
- HVAC system may not work properly.
- A/C may not blow cold air.
- Heater may not produce hot air.
- Blower motor may not function correctly.
Causes of the b0423 OBD Code
Do you know you can clear most fault codes—but some could mean serious danger? Don’t take chances with your safety or your family’s safety. This budget-friendly car scanner makes it easy to clear fault codes in seconds while showing you exactly what’s wrong. Plug it in, connect to your Android or iOS phone, and instantly check live data. You’ll know if it’s a minor issue you can clear or something serious that needs attention—so you can drive safely and stress-free. (Today’s Deal)
Code B0423 typically indicates an issue with the temperature control actuator circuit.
- B0423 can be caused by a faulty Passenger Air Temperature Actuator.
- A Passenger Air Temperature Actuator harness that is open or shorted.
- A Passenger Air Temperature Actuator circuit with poor electrical connection.
Fixing Error Code b0423 Step By Step
Repair the HVAC system blend door actuator circuit for fault code B0423.
- To fix OBDII code B0423, first, review the possible causes related to the code.
- Visually examine the wiring harness and connectors associated with the HVAC control module.
- Check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.
- Repair or replace any damaged wiring or connectors found during the inspection.
- Clear the fault codes from the vehicle’s computer using a scan tool.
- Test drive the vehicle to verify if the B0423 code returns.
- If the code persists, consider replacing the HVAC control module after confirming all wiring and connections are in good condition.
Cost Of Fixing b0423 Fault Code
The repair for fault code B0423 typically involves replacing the HVAC temperature control blend door actuator.
The cost to diagnose and fix OBD code B0423 depends on the estimated 1. 0hour repair time.
Labor rates usually range from $75 to $150 per hour, so the total cost could be between $75 and $150. The final cost may vary based on shop rates and the complexity of the repair.
That fault code is a turning point. If repair costs are climbing and your current loan feels like it’s holding you back, this is the time to plan ahead. The free Car Loan Payment Tracker helps you see how quickly you can pay off what’s left—and start preparing, with confidence, for your dream car.
Details of the b0423 OBD Code
B0423 code indicates a fault in the temperature control #2 circuit.
OBD code B0423 means Temperature Control 1 Circuit Malfunction.
This code is triggered by the HVAC (Heating, Ventilation, and Air Conditioning) system control module when it detects a malfunction in the circuit related to the temperature control for a specific zone or component in the vehicle’s climate control system.
The specific component triggering this code can vary depending on the vehicle make and model, but it typically involves a faulty temperature sensor, actuator, or related wiring in the climate control system.
Mechanic’s Tech Notes
Code B0423 indicates a fault in the temperature control #2 circuit of the HVAC system.
OBDII code B0423 relates to a fault in the HVAC system blend door actuator feedback circuit.
To diagnose, use a multimeter to check for voltage at the actuator connector.
Verify proper ground connection.
Inspect wiring for damage or corrosion.
Scan tools can help monitor actuator movement signals.
If the actuator doesn’t respond, it may need replacement.
Reflashing the HVAC control module could also be necessary.
Regular maintenance of the HVAC system can prevent issues like this.
FAQ
OBD code B0423 indicates an issue with the Passenger Air Temperature Actuator. Check for wiring harness faults and connector issues for repair.
Common symptoms of OBD code B0423 include Engine Light ON. Causes may be a faulty Passenger Air Temperature Actuator or related wiring issues. Inspect and repair as needed.
Diagnose OBD code B0423 by checking Passenger Air Temperature Actuator and its wiring for faults. Repair by fixing any damaged components or connectors.
Wrap Up
If your HVAC system is malfunctioning and you see OBDII code B0423, it may indicate a fault with the HVAC temperature control 2 sensor circuit.
This could be caused by a faulty sensor, damaged wiring, or poor electrical connections.
To address OBDII code B0423, start by inspecting the wiring harness and connectors related to the HVAC temperature control 2 sensor.
Look for any signs of damage, corrosion, or loose connections.
Test the sensor itself for proper operation and replace if necessary to resolve the issue.
