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DTC codes / P0Dxx · Hybrid propulsion / P0D71

P0D71A/C Compressor Control Module Internal Temperature Sensor A Performance

P0D71 means the air conditioning (A/C) compressor control module has detected that its internal temperature sensor circuit is not performing as expected, typically because the signal is out of range or erratic. The module compares the sensor's output against plausible limits and sets this code when the reading does not match the expected profile for the compressor's operating conditions.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyProfessional
AreaHybrid propulsion

Symptoms you may notice

  • The A/C may stop cooling or blow warm air intermittently, especially after the system has been running for a while.
  • The climate control panel may show a flashing or steady A/C warning light, or the compressor may be commanded off by the module.
  • You may hear the compressor clutch cycling rapidly or not engaging at all, depending on how the module reacts to the faulty sensor signal.
  • In some vehicles, the blower motor and vent doors work normally but the air never gets cold.
  • Often no symptoms besides the warning light, because the module may default to a safe strategy that still allows limited A/C operation.
  • A stored code may be the only clue if the sensor fails in a range that does not immediately disable the compressor.

Common causes, most likely first

  1. A failing internal temperature sensor inside the A/C compressor control module, which is the most common cause of this code.
  2. Damaged or corroded wiring and connector pins between the sensor and the control module, often from heat, vibration, or moisture intrusion.
  3. A short or open in the sensor circuit, including chafed harnesses near the compressor or along the engine bay routing.
  4. Poor electrical ground for the compressor control module, causing reference voltage instability that mimics a sensor fault.
  5. A faulty compressor control module itself, where the internal sensor signal processing circuit fails even if the sensor is good.
  6. Low or contaminated refrigerant oil affecting heat transfer and causing the sensor to read outside expected limits, though this is less direct.
  7. Aftermarket or incorrect components installed during previous A/C repairs that do not match the original sensor characteristics.

How to diagnose and fix it

  1. Connect a scan tool and record all stored and pending codes, then clear the code and test-drive with the A/C on to see if P0D71 returns under specific conditions.
  2. Inspect the compressor control module connector and the sensor wiring for corrosion, loose pins, chafing, or heat damage, and repair any obvious harness faults first.
  3. Measure the sensor signal voltage and resistance at the module connector and compare with the manufacturer's expected values for the current ambient and compressor temperature.
  4. Check the module's ground circuit and power supply under load to rule out voltage drops that could distort the sensor reading.
  5. If the sensor is serviceable separately, replace it; if it is integrated into the control module, replace the module and perform any required programming or calibration.
  6. Verify refrigerant charge and oil condition only after electrical checks pass, since incorrect charge can affect compressor temperature but rarely sets this specific sensor performance code alone.
  7. Clear codes and run the A/C system through several full cycles, including idle and highway-speed conditions, to confirm the repair and ensure the code does not return.

What the internal temperature sensor really does

  • This sensor is not the same as the A/C refrigerant pressure sensor or the evaporator temperature sensor, so replacing those parts will not fix P0D71.
  • A common misdiagnosis is to replace the entire compressor when only the control module's internal sensor has drifted, so always test the sensor signal at the module connector first.
  • Heat soak after shutdown can make an intermittent sensor fault appear only on a hot restart, so a cold-only test may pass and mislead you.
  • The module may set P0D71 without disabling the compressor completely, using a default temperature value that keeps the system running but with reduced protection.
  • Corroded pins in the compressor control module connector often look clean from the outside, so back-probe the circuit while wiggling the harness to catch intermittent faults.

Can I keep driving with P0D71?

You can usually drive the vehicle with this code because it affects the A/C system rather than the engine or safety systems, but avoid long trips in hot weather if cooling performance is reduced. Have the fault diagnosed soon to prevent the compressor from running without proper temperature protection, which can lead to a more expensive failure.

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 all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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