A/C Evaporator Temperature Sensor Circuit Range/Performance
The P0536 code indicates that the A/C evaporator temperature sensor is reporting a value outside the expected range or its performance is degraded. This sensor monitors the temperature of the evaporator core to prevent icing and control the A/C system. The PCM detects that the sensor signal is not within the normal operating parameters, which can be due to a faulty sensor, wiring issues, or a refrigerant problem.
01. Most Common Causes
- Faulty A/C evaporator temperature sensor
- Open or shorted sensor circuit wiring
- Poor electrical connection in sensor circuit
- Low refrigerant charge causing abnormal evaporator temperatures
02. Symptoms You Will Notice
- A/C system not cooling properly
- A/C compressor cycling on and off frequently
- Check Engine Light illuminated
- Possible frost on A/C lines or evaporator
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve the code and check freeze frame data.
Step 2: Inspect the A/C evaporator temperature sensor and its wiring for damage or corrosion.
Step 3: Test the sensor resistance with a multimeter and compare to manufacturer specifications.
Step 4: Check the A/C system refrigerant pressure to ensure proper charge.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, but the A/C may not work properly. Driving without A/C is safe, but if the sensor fails, it could cause the compressor to run continuously and potentially damage the system.
How much does it cost to fix?▼
Typically $50 to $150 for parts and labor, depending on the sensor location and accessibility.