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DTC codes / Chrysler codes / P1535

P1535 · ChryslerA/C High Side Temperature Sensor Circuit

P1535 on Chrysler vehicles indicates the powertrain control module (PCM) has detected an abnormal signal from the air conditioning (A/C) high side temperature sensor circuit. This sensor monitors the refrigerant temperature on the high-pressure side of the A/C system, and the PCM uses that data to protect the compressor from overheating and to optimize cooling performance. The code sets when the sensor signal falls outside the expected voltage range or is inconsistent with other system inputs.

SystemPowertrain
Code typeChrysler specific
SeverityMedium
Fix difficultyIntermediate
AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

  • The air conditioning may blow warm air or fail to cool the cabin effectively.
  • The A/C compressor clutch may disengage prematurely or not engage at all.
  • The warning light on the dashboard illuminates, often accompanied by a chime.
  • In some cases, the driver may notice no symptoms besides the warning light.
  • The A/C system may exhibit erratic operation, cycling on and off rapidly.
  • Underhood temperatures may rise if the A/C system is disabled, affecting engine cooling.

Common causes, most likely first

  1. A faulty A/C high side temperature sensor sending an incorrect signal.
  2. Damaged or corroded wiring or connectors in the sensor circuit.
  3. An open or short circuit in the sensor wiring harness.
  4. Poor electrical connection at the PCM or sensor ground.
  5. A malfunctioning PCM that misinterprets the sensor signal.
  6. Refrigerant system issues such as low charge or overcharge affecting sensor readings.
  7. Physical damage to the sensor from heat or debris.

How to diagnose and fix it

  1. Use a scan tool to retrieve the code and view live data for the A/C high side temperature sensor to confirm the fault.
  2. Visually inspect the sensor and its wiring for obvious damage, corrosion, or loose connections.
  3. Check the sensor's resistance or voltage output against Chrysler specifications using a multimeter.
  4. Test the wiring harness for continuity and shorts between the sensor and PCM.
  5. Replace the A/C high side temperature sensor if it fails the electrical tests.
  6. Clear the code and verify the repair by running the A/C system and monitoring live data.
  7. If the code persists, diagnose the PCM and its connections or consult a Chrysler specialist.

Don't Overlook the A/C High Side Sensor Circuit

  • A common mistake is replacing the A/C compressor when the real issue is a faulty high side temperature sensor or its wiring, which is far cheaper to fix.
  • The sensor's signal can be skewed by low refrigerant charge, so always check system pressures before condemning the sensor.
  • Corrosion inside the connector pins often causes intermittent P1535 codes that don't appear during a quick inspection.
  • On some Chrysler models, the A/C high side temperature sensor shares a ground with other sensors, so a bad ground can set multiple codes.
  • The PCM may disable the A/C compressor to protect it when this code sets, leading to a no-cooling complaint even though the sensor is the only fault.

Can I keep driving with P1535?

You can generally continue driving with this code because it primarily affects A/C performance and does not compromise engine safety. However, avoid using the A/C system until the fault is repaired to prevent potential compressor damage, and address the issue promptly to maintain cabin comfort and system longevity.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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