Evaporator Temperature Sensor Circuit
The P0535 code means the vehicle's onboard diagnostic system has detected: Evaporator Temperature Sensor Circuit. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $100 - $500 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
What Are the Symptoms of P0535?
- Check Engine Light on
- AC system not regulating temperature properly
- Evaporator may freeze up
- Inconsistent cabin temperature
What Causes P0535? (Most Likely First)
- Faulty evaporator temperature sensor Very High
- Wiring fault in evaporator sensor circuit High
- Corroded connector at evaporator sensor Moderate
- HVAC control module failure Low
Can I Still Drive with P0535?
Yes, but fix soon. P0535 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
What is the evaporator temperature sensor?
The evaporator temperature sensor monitors the temperature of the AC evaporator core inside the dashboard. It prevents the evaporator from freezing by cycling the compressor off when the evaporator approaches 32 degrees F.
Can a bad evaporator sensor cause the AC to freeze up?
Yes. If the sensor reads warmer than actual temperature, the compressor will not cycle off when needed, allowing the evaporator to freeze. A frozen evaporator blocks airflow and can cause water to drip inside the cabin.
Is the evaporator temperature sensor hard to replace?
The sensor itself is inexpensive, but access can be difficult since it is located inside the HVAC housing behind the dashboard. Some vehicles allow access through a small opening, while others require significant dashboard disassembly.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0535?
-
Read evaporator temperature sensor value with a scan tool and compare to actual temperature
-
Check evaporator temperature sensor connector and wiring for damage behind the dashboard
-
Measure sensor resistance and compare to temperature-resistance chart in service manual
-
Verify HVAC control module is receiving the sensor signal correctly
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0535?
- 2010-2020 Toyota Corolla
- 2012-2019 Honda Accord
- 2008-2018 Chevrolet Malibu
- 2011-2020 Nissan Altima
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.