P0538 Cadillac A/C Evaporator Temperature Circuit High 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
– 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 high the Powertrain Control Module (PCM) will triggered the P0538 Cadillac code.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
– A/C Inoperative
– A/C Blows Warm
– A/C Inoperative
– A/C Blows Warm
P0538 Cadillac 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).
Cadillac Vehicle:Cadillac CTS Coupe, Cadillac CTS-V Coupe , Cadillac Eldorado , Cadillac Escalade EXT , Cadillac ATS , Cadillac CTS , Cadillac CTS Sedan , Cadillac CTS Sport Sedan , Cadillac CTS-V , Cadillac CTS-V Sedan , Cadillac Catera , Cadillac DTS , Cadillac DeVille , Cadillac STS-V , Cadillac STS , Cadillac Seville , Cadillac XTS , Cadillac XLR , Cadillac XLR Platinum , Cadillac Escalade , Cadillac SRX