Powertrain, generic · Vehicle speed, idle control and auxiliary inputs
P0535 A/C Evaporator Temperature Sensor Circuit
Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo
The evaporator temperature sensor, an NTC thermistor behind the evaporator, prevents icing: near 0–3 °C the compressor is switched off or reduced. Usually the climate module reads it and reports body codes; P0535–P0539 only arise where the engine module controls the compressor and reads the sensor. P0535 is the general circuit fault; the compressor is usually locked out or run with a substitute value. No manufacturer document available to us uses this code; the description follows CARB's input component rules.
Likely causes
Sensor faulty
Connector corroded by condensate
Wire open or shorted
Engine module
Symptoms
- Air conditioning not or weakly cooling
- Evaporator icing, airflow decreasing
- Compressor cycling unusually
Repair estimate
DifficultyMediumDIY possible
Parts and labour€30–400
Time0.5–4 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
evaporator temperature sensorsensor wiringengine control module
Related codes
References: law.cornell.edu, hella.com, en.wikipedia.org.