P0535
UniversalA/C Evaporator Temperature Sensor Circuit
Low SeverityThe powertrain control module (PCM) has detected a malfunction in the circuit for the A/C evaporator temperature sensor. This means the system cannot accurately read the temperature of the air leaving the evaporator, which can lead to inefficient or improperly controlled air conditioning.
⚠️ Before You Begin (Safety First)
Always practice safe repair procedures. Disconnect the battery before working on electrical components to prevent accidental shorts or injury. Allow the engine and all components to cool down before handling to avoid burns. Wear appropriate personal protective equipment, such as safety glasses and gloves.
Common Symptoms
- Air conditioning system not blowing cold air
- Air conditioning blowing excessively cold air or freezing up
- Inconsistent A/C temperature output
- Check Engine Light (CEL) illuminated
- A/C system cycling on and off excessively
Common Causes
- Faulty A/C evaporator temperature sensor
- Open or short circuit in the A/C evaporator temperature sensor wiring
- Corroded or loose electrical connector at the sensor or PCM
- Faulty powertrain control module (PCM) (less common)
Frequently reported on: General/Universal
Diagnostic Steps
- Visually inspect the A/C evaporator temperature sensor and its wiring for any signs of damage, fraying, or corrosion.
- Check the electrical connector at the sensor and ensure it is clean and securely attached.
- If accessible, you can test the resistance of the sensor using a multimeter. Compare the reading to the manufacturer's specifications (values typically change with temperature).
- If the sensor is faulty or the wiring is damaged, replace the sensor or repair the wiring as needed.
- Clear the diagnostic trouble code (DTC) using an OBD-II scanner and test the A/C system to see if the code returns.
👨🔧 When to Call a Professional
While a malfunctioning A/C system is often a convenience issue, a P0535 code can sometimes be a symptom of a deeper electrical problem. Consider professional help if the code persists after replacing the sensor and checking basic wiring, or if the repair involves extensive dashboard disassembly which can be complex and time-consuming. Complex electrical diagnostics often require specialized tools and expertise.
Commonly Asked Questions
What does P0535 mean?
P0535 indicates an issue with the circuit of the A/C evaporator temperature sensor, meaning the car's computer isn't getting a reliable reading from it.
Can I drive with a P0535 code?
Yes, you can typically drive your vehicle with a P0535 code, as it primarily affects the functionality of your air conditioning system and usually does not impact vehicle drivability or safety. However, it's best to address it to restore A/C performance.
Where is the A/C evaporator temperature sensor located?
The A/C evaporator temperature sensor is usually located inside the evaporator housing, often behind the dashboard or glove box, near the evaporator core itself.
What is the most common fix for P0535?
The most common fix for P0535 is replacing the faulty A/C evaporator temperature sensor, followed by inspecting and repairing any damaged wiring or connectors in its circuit.
Will fixing P0535 improve my car's performance?
Fixing a P0535 code will primarily improve the performance and efficiency of your vehicle's air conditioning system, ensuring it cools properly and prevents issues like evaporator freezing. It will not affect engine performance.