P0D72
DTC P0D69-P0D7F
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0D69
- A/C Compressor Motor Voltage Sensor Performance
DTC P0D6A
- A/C Compressor Motor Voltage Sensor Circuit High Voltage
DTC P0D6B
- A/C Compressor Motor Voltage Sensor Circuit Low Voltage
DTC P0D6F
- A/C Compressor Motor High Current
DTC P0D71
- Electric A/C Compressor Control Module Temperature Sensor Performance
DTC P0D72
- Electric A/C Compressor Control Module Temperature Sensor Circuit High Voltage
DTC P0D73
- Electric A/C Compressor Control Module Temperature Sensor Circuit Low Voltage
DTC P0D76
- Electric A/C Compressor Control Module Output Driver Temperature Sensor Performance
DTC P0D77
- Electric A/C Compressor Control Module Output Driver Temperature Sensor Circuit High Voltage
DTC P0D78
- Electric A/C Compressor Control Module Output Driver Temperature Sensor Circuit Low Voltage
DTC P0D7A
- A/C Compressor Motor Phase U Low Current
DTC P0D7B
- A/C Compressor Motor Phase U High Current
DTC P0D7C
- A/C Compressor Motor Phase V Low Current
DTC P0D7D
- A/C Compressor Motor Phase V High Current
DTC P0D7E
- A/C Compressor Motor Phase W Low Current
DTC P0D7F
- A/C Compressor Motor Phase W High Current
Circuit/System Description
The AC compressor function is to provide refrigerant flow in the AC refrigerant loop to help cool down the cabin, help dehumidify the air in a defrost mode and help maintain the battery temperature. Rather than a more-typical pulley, the A/C compressor uses a 3-phase alternating current, high voltage electric motor to operate. It has an on-board inverter that takes High Voltage direct current from the vehicle's High Voltage Battery and inverts it to alternating current for the motor. The AC compressor shall be activated when any of the three following events occur:
* The customer pushes the AC button
* The HVAC control, in AUTO mode, requests the electric AC compressor on to help in cooling the cabin or removing moisture in the defrost mode
* The High Voltage Battery Thermal System requests the AC compressor on to help maintain the battery temperature
The Hybrid Powertrain control module 2 (HPCM2) uses values from the A/C refrigerant pressure transducers, A/C refrigerant thermistor, duct temperature sensors, ambient air temperature sensor , passenger compartment temperature sensor, evaporator temperature sensor, battery cell temperature sensors, battery coolant temperature sensors and battery coolant pumps to determine the speed at which the compressor will operate. This speed request message is sent from the HPCM2 to the A/C compressor control module via GM LAN message.
Conditions for Running the DTC
CertainThe performance DTCs in this group, P0D69, P0D71, P076, are intended to run after a long ambient soak period, such as being parked overnight, when a hot engine condition has cooled, etc.
DTC P0D69
* System voltage is above 9 V.
* ACCM is awake.
* Main HV battery contactors must be closed.
* DTCs P0D6A; P0D6B, P0ABC, P0ABD, P0ABB, P0AF8, P1A07, U1111, U185A, P0AE4, P0AD9, P0AA1, P0ADD, P1EBC, P0AE2 must not be set.
DTC P0D6A
* System voltage is above 9 V.
* ACCM is awake.
* Difference between the ACCM high voltage levels and the high voltage Battery Pack Side Voltage is less than 15V.
* There are no battery pack voltage DTC's set.
* Battery Pack Voltage Sensors are valid.
DTC P0D6B
* System voltage is above 9 V.
* ACCM is awake.
* Difference between the ACCM high voltage levels and the high voltage Battery Pack Side Voltage exceeds 15V.
* Battery Pack Voltage Sensors are valid.
* There are no battery pack voltage DTC's set.
* Main HV Contactors are Closed
* No main HV contactor faults are active
DTC P0D6F
* System voltage is above 9 V.
* ACCM is awake.
* Compressor Speed Request is greater than 0 rpm
DTC P0D71
* System voltage is above 9 V.
* Vehicle is in Run Mode or Charging Mode with RESS Thermal Active
* Compressor has been off for > 6 hours
* Outside Air temperature is greater than -7 deg C
* Engine Coolant Temperature is within 15 deg C of outside air temperature
* DTCs P0D77, P0D78, P0606 P0073; P0072; P0071, P0113, P0112, P0111, P0114, P0119; P0118; P0117; P0116, P0D72; P0D73 must not be set
DTC P0D72
* System voltage is above 9 V.
* ACCM is awake.
* Outside Air temperature is greater than -7 deg C
* Following DTCs are not set: CPU Temp Sensor, OUTPUT DRIVER Temp Sensor, OAT, Engine Coolant Temperature sensor.
DTC P0D73
* System voltage is above 9 V.
* ACCM is awake.
DTC P0D76
* System voltage is above 9 V.
* ACCM is awake.
* Outside Air temperature is greater than -7 deg C
* Engine Coolant Temperature is within 15 deg C of outside air temperature
* Compressor has been off for > 6 hours
* Following DTCs are not set: P0D77; P0D78, P0606, P0073; P0072; P0071, P0073; P0072; P0071, P0113, P0112, P0111, P0114, P0119; P0118; P0117; P0116
DTC P0D77
* System voltage is above 9 V.
* ACCM is awake
* Outside Air temperature is greater than -7 deg C
* Compressor Speed Request is greater than 0 rpm
DTC P0D78
* System voltage is above 9 V.
* ACCM is awake
DTC P0D7A
* System voltage is above 9 V.
* ACCM is awake
* Compressor Speed Request is 0 rpm
DTC P0D7B
* System voltage is above 9 V.
* ACCM is awake
* Compressor Speed Request is 0 rpm
DTC P0D7C
* System voltage is above 9 V.
* ACCM is awake
* Compressor Speed Request is 0 rpm
DTC P0D7D
* System voltage is above 9 V.
* ACCM is awake
* Compressor Speed Request is 0 rpm
DTC P0D7E
* System voltage is above 9 V.
* ACCM is awake
* Compressor Speed Request is 0 rpm
DTC P0D7F
* System voltage is above 9 V.
* ACCM is awake
* Compressor Speed Request is 0 rpm
Conditions for Setting the DTC
DTC P0D69
Compressor High Voltage Input Voltage is not within 10 15 V of High Voltage Battery Voltage
DTC P0D6A
ACCM Input Voltage is greater than 450V for 6 seconds
DTC P0D6B
ACCM Input Voltage is less than 190V for 6 seconds
DTC P0D6F
ACCM DC current draw is greater than 27 amps for more than 6 seconds.
DTC P0D71
Compressor CPU Temperature Sensor is not within 10 deg C of Intake Air Temp Sensor and compressor CPU Temperature Sensor is not within 10 deg C of Compressor OUTPUT DRIVER Temp Sensor
DTC P0D72
less than -40 deg C for 6 seconds.
DTC P0D73
greater than 274 deg C for 6 seconds.
DTC P0D76
Compressor Driver Temperature Sensor is not within 7 deg C of Intake Air Temp Sensor and compressor CPU Driver Temperature Sensor is not within 11 deg C of OAT Sensor
DTC P0D77
ACCM module output driver temperature sensor is less than -40 deg C
DTC P0D78
ACCM module output driver temperature sensor is greater than 274 deg C
DTC P0D7A
ACCM Motor current U-phase Input>= 68 amps
DTC P0D7B
ACCM Motor current U-phase Input <= -68 amps
DTC P0D7C
ACCM Motor current V-phase Input >= 68 amps
DTC P0D7D
ACCM Motor current V-phase Input<=-68 amps
DTC P0D7E
ACCM Motor current W-phase Input>= 68 amps
DTC P0D7F
ACCM Motor current W-phase Input <= -68 amps
Action Taken When the DTC Sets
The ACCM is disabled.
Conditions for Clearing the DTC
These are all type B DTC's
Reference Information
Schematic Reference
HVAC Schematics HVAC - Automatic
Connector End View Reference
Component Connector End Views Hybrid/EV Battery Pack X1 A4
Description and Operation
Automatic HVAC Description and Operation HVAC - Automatic
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Verify that DTC P0D69-P0D7F is not set.
If the DTC is set, verify that the A/C compressor control module and the VICM (HPCM2) have the latest software and reprogram the modules if needed.
Circuit/System Testing
Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.
The High Voltage Disabling procedure will perform the following tasks:
* Identify how to disable high voltage.
* Identify how to test for the presence of high voltage.
* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment:
* Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors.
* Certified and up-to-date Class "0" Insulation gloves rated at 1000V with leather protectors.
- Visually and functionally inspect the gloves before use.
- Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not.
Failure to follow the procedures exactly as written may result in serious injury or death.
1. Verify that there are no fuses blown, open connectors, broken wires for the high voltage circuit.
• Repair blown fuses, open connectors, broken wires on the high voltage circuit
2. Operate the vehicle within the conditions for running the DTC. If the DTC resets, replace the A/C compressor
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* HVAC Component Replacement Reference HVAC Component Replacement Reference
* Control Module References Control Module References