P1436: A/C Evaporator Air Temperature Circuit Low

Definition

The OBD2 code P1436 indicates that the A/C evaporator air temperature sensor circuit is reading a low voltage, which may suggest a malfunction in the sensor or its wiring

Common causes

Faulty A/C evaporator temperature sensor
Wiring issues (shorts, opens, or corrosion)
Poor electrical connections
Faulty engine control module (ECM)
Refrigerant leaks or low refrigerant levels
A/C system malfunction
Faulty climate control module

Common misdiagnoses

Faulty A/C compressor
Refrigerant leak
Bad A/C pressure switch
Malfunctioning thermostat
Wiring issues or shorts in the circuit
Faulty A/C control module
Incorrect refrigerant charge
Blocked or restricted airflow in the A/C system

Troubleshooting steps

1. Check the A/C System
2. Ensure that the A/C system is properly charged with refrigerant. Low refrigerant levels can affect temperature readings
3. Inspect the Wiring and Connectors
4. Examine the wiring and connectors associated with the A/C evaporator temperature sensor. Look for signs of damage, corrosion, or loose connections that could cause a poor signal
5. Test the A/C Evaporator Temperature Sensor
6. Use a multimeter to test the resistance of the evaporator temperature sensor. Compare the readings to the specifications in the vehicle’s service manual. If the sensor is out of range, it may need to be replaced
7. Check for Short Circuits
8. Inspect the wiring for any short circuits to ground or power that could cause the low signal reading. Use a multimeter to check for continuity and proper voltage
9. Inspect the A/C Control Module
10. If the sensor and wiring are functioning correctly, the issue may lie within the A/C control module. Check for any fault codes in the module and consider reprogramming or replacing it if necessary
11. Clear Codes and Test Drive
12. After performing any repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns
13. Check for Other Related Codes
14. Look for any other related trouble codes that may provide additional context for the issue. Sometimes multiple codes can point to a common problem
15. Consult Technical Service Bulletins (TSBs)
16. Check for any TSBs related to the A/C system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes
17. Seek Professional Help
18. If the problem persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with A/C systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P1436 code

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the A/C System

2. Ensure that the A/C system is properly charged with refrigerant. Low refrigerant levels can affect temperature readings

3. Inspect the Wiring and Connectors

4. Examine the wiring and connectors associated with the A/C evaporator temperature sensor. Look for signs of damage, corrosion, or loose connections that could cause a poor signal

5. Test the A/C Evaporator Temperature Sensor

6. Use a multimeter to test the resistance of the evaporator temperature sensor. Compare the readings to the specifications in the vehicle’s service manual. If the sensor is out of range, it may need to be replaced

7. Check for Short Circuits

8. Inspect the wiring for any short circuits to ground or power that could cause the low signal reading. Use a multimeter to check for continuity and proper voltage

9. Inspect the A/C Control Module

10. If the sensor and wiring are functioning correctly, the issue may lie within the A/C control module. Check for any fault codes in the module and consider reprogramming or replacing it if necessary

11. Clear Codes and Test Drive

12. After performing any repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

13. Check for Other Related Codes

14. Look for any other related trouble codes that may provide additional context for the issue. Sometimes multiple codes can point to a common problem

15. Consult Technical Service Bulletins (TSBs)

16. Check for any TSBs related to the A/C system for your specific vehicle make and model. Manufacturers may have issued guidance on common issues and fixes

17. Seek Professional Help

18. If the problem persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with A/C systems and OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P1436 code