What does code P1535 mean?

Q: What does code P1535 mean?

A/C High Side Temperature Sensor Circuit. P1535 on a GM vehicle means the powertrain control module (PCM) has detected an abnormal signal from the air conditioning (A/C) high side temperature sensor, which monitors refrigerant temperature at the condenser outlet or high-pressure line. The PCM compares this reading against expected values and flags the code when the sensor circuit voltage falls outside the calibrated range for a set time.

DTC codes / GM codes / P1535

P1535 · GMA/C High Side Temperature Sensor Circuit

P1535 on a GM vehicle means the powertrain control module (PCM) has detected an abnormal signal from the air conditioning (A/C) high side temperature sensor, which monitors refrigerant temperature at the condenser outlet or high-pressure line. The PCM compares this reading against expected values and flags the code when the sensor circuit voltage falls outside the calibrated range for a set time.

SystemPowertrain

Code typeGM specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.