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DTC codes / P0Dxx · Hybrid propulsion / P0D68

P0D68A/C Compressor Motor Voltage Sensor A Circuit

P0D68 indicates that the air conditioning (A/C) compressor motor voltage sensor A circuit has reported an abnormal voltage reading to the control module. The computer detects a voltage that falls outside the expected range for the compressor's operating state, which can prevent the A/C system from engaging or cause it to shut down for protection.

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

Symptoms you may notice

  • The A/C compressor may not engage at all, resulting in no cold air from the vents.
  • The A/C compressor may run intermittently or cycle rapidly before stopping.
  • A warning light on the dashboard, often the A/C or service vehicle soon light, may illuminate.
  • In some vehicles, the climate control panel may flash or show a fault message.
  • Often no symptoms besides the warning light, especially if the fault is intermittent.
  • The engine cooling fan may run continuously as a failsafe when the A/C request is active.

Common causes, most likely first

  1. A faulty A/C compressor motor voltage sensor or its internal circuitry.
  2. Damaged, corroded, or loose wiring or connectors in the sensor A circuit.
  3. A short to ground or short to voltage in the sensor signal or reference circuit.
  4. An open circuit in the sensor wiring, including a broken wire or poor terminal tension.
  5. A failing A/C compressor control module or driver that misreads the sensor signal.
  6. Low or contaminated refrigerant oil affecting sensor operation (less common).
  7. A defective A/C compressor motor causing abnormal voltage feedback to the sensor.

How to diagnose and fix it

  1. Perform a visual inspection of the A/C compressor harness and connectors for damage, corrosion, or loose pins.
  2. Use a scan tool to read live data for the A/C compressor motor voltage sensor and compare to specifications.
  3. Check the sensor reference voltage and ground at the sensor connector with a digital multimeter.
  4. Test the sensor signal circuit for continuity, shorts to ground, and shorts to voltage with the ignition off.
  5. If wiring is good, substitute a known-good sensor or perform a resistance check on the sensor itself.
  6. Inspect the A/C compressor control module for signs of damage or water intrusion, and test its outputs if accessible.
  7. Clear the code and verify the repair by running the A/C system and monitoring live data for normal voltage readings.

Before you replace the A/C compressor

  • A loose or corroded connector at the compressor is a frequent culprit that mimics a failed sensor, so always wiggle-test the harness while watching live data.
  • The code can set intermittently due to vibration or heat, and a simple continuity test may pass when the fault is not present, so road-test with the scanner recording.
  • Some vehicles use the compressor motor voltage sensor for clutch engagement feedback, and a fault can disable the A/C even if the compressor itself is mechanically sound.
  • A weak battery or charging system issue can cause erratic sensor readings and set this code, so verify system voltage first.
  • Replacing the compressor without diagnosing the circuit often leads to a repeat failure because the original wiring fault remains.

Can I keep driving with P0D68?

You can usually continue driving with this code because the A/C system may simply be disabled, but avoid using the A/C to prevent potential compressor damage. If the engine overheats or the cooling fan runs constantly, have the vehicle inspected promptly.

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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