P0D6D

What it means

P0D6D means the control unit monitoring the electric A/C compressor motor saw the voltage on its 'A' supply or motor circuit fall below the expected range. It is usually found on hybrid and electric vehicles with a high-voltage compressor, and it can also cover low-voltage control supplies on some models. Which circuit 'A' refers to depends on the vehicle, so check the manufacturer's information for the model.

Symptoms

• A/C blows warm or does not cool
• A/C compressor does not run or cuts out soon after starting
• Warning light on the dash, possibly with an A/C fault message
• Reduced climate control performance or an A/C system disabled message
• On some hybrid or electric models, reduced power or battery temperature warnings

Possible causes

• Poor connection, corrosion or damaged wiring in the compressor motor or its supply circuitlikely
• Blown fuse or faulty relay or contactor feeding the compressor circuitpossible
• Low 12 V battery voltage or a weak charging or DC-DC converter supply affecting the compressor control circuitpossible
• Internal fault in the electric compressor motor or its integrated inverterlikely
• Fault in the high-voltage supply to the compressor, such as a junction box or high-voltage cable issue, depending on modelpossible
• Faulty climate control or hybrid control unit, or an outdated calibration where the manufacturer has issued a fixrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting battery voltage, vehicle state and A/C request at the time the code set
2. Check for related codes covering the compressor, high-voltage system, DC-DC converter or communication faults, and deal with those first
3. Check the 12 V battery condition and charging voltage, since low supply voltage can set this fault
4. Visually inspect the compressor wiring, connectors and relevant fuses for damage, water ingress, corrosion or heat marks
5. Check the manufacturer's information for the circuit 'A' definition and test procedure on this model
6. Test the supply voltage and ground at the compressor connector against specification, after the high-voltage system has been made safe by a trained technician
7. Check the live data for compressor commanded and actual speed and for supply voltage while A/C is requested
8. Check for technical service bulletins or calibration updates that apply to this model

How to fix

• Repair or replace damaged wiring or connectors and clean corrosion in the affected circuit
• Replace any faulty fuse or relay after finding why it failed
• Restore correct 12 V battery and charging performance if the supply is low
• Replace the electric A/C compressor or its inverter if it is confirmed faulty, using the correct oil and refrigerant procedure
• Repair the high-voltage supply fault, carried out only by a technician trained in high-voltage systems
• Update the control unit calibration only if the manufacturer lists it as a fix for this fault

Can I keep driving?

Nearby codes

• P0D6CGenericA/C Compressor Motor Voltage Sensor A Circuit Intermittent/Erratic
• P0D6EGenericA/C Compressor Motor Voltage A High