P0537 Audi A/C Evaporator Temperature Circuit Low Input

P0537 Audi A/C Evaporator Temperature Circuit Low Input

Possible causes
– Faulty A/C Evaporator Temperature Sensor
– A/C Evaporator Temperature Sensor harness is open or shorted
– A/C Evaporator Temperature Sensor circuit poor electrical connection
What about the obd code?
When the A/C Evaporator Temperature (ACET) sensor signal is low the Powertrain Control Module (PCM) will triggered the P0537 Audi code.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– A/C Inoperative
– A/C Blows Warm
P0537 Audi Description

The Powertrain Control Module (PCM) sources a low current 5 volts on the A/C Evaporator Temperature (ACET) sensor circuit. As the A/C evaporator air temperature changes, the ACET circuit resistance changes (which changes the voltage the PCM detects).

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