P0Axx OBD-II Codes (P0A00–P0A99)

155 fault codes in the P0Axx range. Click any code for causes, diagnostic steps, severity, and common fixes.

P0A00 moderate
Motor Electronics Coolant Temperature Sensor Circuit
P0A01 moderate
Motor Electronics Coolant Temperature Sensor Range/Performance
P0A02 critical
Motor Electronics Coolant Pump Control Circuit/Open
P0A03 critical
Motor Electronics Coolant Pump Control Circuit Low
P0A04 critical
Motor Electronics Coolant Pump Control Circuit High
P0A05 moderate
Motor Electronics Coolant Pump Motor Performance
P0A06 critical
Motor Electronics Coolant Temperature High
P0A07 low
Motor Electronics Coolant Temperature Low
P0A08 moderate
DC/DC Converter Status Circuit
P0A09 critical
DC/DC Converter Status Circuit Low
P0A0A moderate
DC/DC Converter Status Circuit High
P0A0B critical
DC/DC Converter Performance
P0A0C critical
Drive Motor A Position Sensor Circuit
P0A0D critical
Drive Motor A Position Sensor Range/Performance
P0A0E critical
Drive Motor A Position Sensor Circuit Low
P0A0F critical
Drive Motor A Position Sensor Circuit High
P0A10 moderate
DC/DC Converter Enable Circuit
P0A11 moderate
DC/DC Converter Enable Circuit Low
P0A12 moderate
DC/DC Converter Enable Circuit High
P0A13 critical
HV Battery Pack Temperature Sensor Circuit
P0A14 critical
HV Battery Pack Temperature Sensor Range/Performance
P0A15 critical
HV Battery Pack Temperature Sensor Circuit Low
P0A16 critical
HV Battery Pack Temperature Sensor Circuit High
P0A17 critical
Motor/Generator A Torque Sensor Circuit
P0A18 critical
Motor/Generator A Torque Sensor Range/Performance
P0A19 critical
Motor/Generator A Torque Sensor Circuit Low
P0A1A moderate
Motor/Generator A Temperature Sensor Circuit
P0A1B critical
Motor/Generator A Temperature High
P0A1C moderate
HV Battery Pack Cooling Fan 1 Control Circuit/Open
P0A1D moderate
HV Battery Pack Cooling Fan 1 Control Circuit Low
P0A1E moderate
HV Battery Pack Cooling Fan 1 Control Circuit High
P0A1F moderate
HV Battery Pack Cooling Fan 1 Performance
P0A20 moderate
HV Battery Pack Temperature Variation
P0A21 critical
Motor/Generator A Performance
P0A22 critical
Motor/Generator B Performance
P0A23 critical
Motor/Generator A Over Temperature
P0A24 critical
Motor/Generator B Over Temperature
P0A25 critical
HV Battery Voltage System Isolation Fault
P0A26 moderate
HV Battery Sense Circuit
P0A27 moderate
HV Battery Sense Circuit Range/Performance
P0A28 moderate
HV Battery Sense Circuit Low
P0A29 moderate
HV Battery Sense Circuit High
P0A2A critical
Inverter Cooling System Performance
P0A2B moderate
Inverter Coolant Temperature Sensor Circuit
P0A2C moderate
Inverter Coolant Temperature Sensor Range/Performance
P0A2D moderate
Inverter Coolant Temperature Sensor Circuit Low
P0A2E moderate
Inverter Coolant Temperature Sensor Circuit High
P0A2F critical
Inverter Coolant Pump Control Circuit/Open
P0A30 critical
Inverter Coolant Pump Control Circuit Low
P0A31 critical
Inverter Coolant Pump Control Circuit High
P0A32 moderate
Inverter Coolant Pump Motor Performance
P0A33 critical
Motor/Generator A Inverter Phase U Current Sensor
P0A34 critical
Motor/Generator A Inverter Phase V Current Sensor
P0A35 critical
Motor/Generator A Inverter Phase W Current Sensor
P0A36 critical
Motor/Generator B Inverter Phase U Current Sensor
P0A37 critical
Motor/Generator B Inverter Phase V Current Sensor
P0A38 critical
Motor/Generator B Inverter Phase W Current Sensor
P0A39 critical
Motor/Generator A Inverter Over Temperature
P0A3A critical
Motor/Generator B Inverter Over Temperature
P0A3B critical
HV Battery Pack State of Charge Low
P0A3C moderate
HV Battery Pack State of Charge High
P0A3D critical
HV Battery Cell Voltage Low
P0A3E critical
HV Battery Cell Voltage High
P0A3F moderate
HV Battery Cell Voltage Variation
P0A40 moderate
Drive Motor A Stator Winding Temperature Sensor Circuit
P0A41 moderate
Drive Motor A Stator Winding Temperature Sensor Range/Performance
P0A42 moderate
Drive Motor A Stator Winding Temperature Sensor Circuit Low
P0A43 moderate
Drive Motor A Stator Winding Temperature Sensor Circuit High
P0A44 moderate
Drive Motor B Stator Winding Temperature Sensor Circuit
P0A45 moderate
Drive Motor B Stator Winding Temperature Sensor Range/Performance
P0A46 moderate
Drive Motor B Stator Winding Temperature Sensor Circuit Low
P0A47 moderate
Drive Motor B Stator Winding Temperature Sensor Circuit High
P0A48 critical
Generator A Over Temperature
P0A49 critical
Generator B Over Temperature
P0A4A critical
Motor/Generator A Control Module
P0A4B critical
Motor/Generator B Control Module
P0A4C critical
Motor/Generator A Inverter DC Bus Voltage Too Low
P0A4D critical
Motor/Generator A Inverter DC Bus Voltage Too High
P0A4E critical
Motor/Generator B Inverter DC Bus Voltage Too Low
P0A4F critical
Motor/Generator B Inverter DC Bus Voltage Too High
P0A50 critical
HV Battery Contactor Circuit
P0A51 critical
HV Battery Positive Contactor Circuit
P0A52 critical
HV Battery Negative Contactor Circuit
P0A53 critical
HV Battery Precharge Contactor Circuit
P0A54 critical
HV Battery Precharge Time Too Long
P0A55 critical
HV Battery Contactor Stuck Closed
P0A56 critical
HV Battery Current Sensor Circuit
P0A57 critical
HV Battery Current Sensor Range/Performance
P0A58 critical
HV Battery Current Sensor Circuit Low
P0A59 critical
HV Battery Current Sensor Circuit High
P0A5A moderate
HV Battery Voltage Sensor Circuit
P0A5B moderate
HV Battery Voltage Sensor Range/Performance
P0A5C moderate
HV Battery Voltage Sensor Circuit Low
P0A5D moderate
HV Battery Voltage Sensor Circuit High
P0A5E critical
Regenerative Braking Control System
P0A5F critical
Regenerative Braking System Performance
P0A60 critical
Regenerative Braking Control Module
P0A61 moderate
HV Battery Pack Fan Overcurrent
P0A62 moderate
HV Battery Pack Fan Undercurrent
P0A63 critical
HV Battery System Isolation Fault - Positive
P0A64 critical
HV Battery System Isolation Fault - Negative
P0A65 critical
Auxiliary Battery Voltage System Isolation Fault
P0A66 critical
HV Battery System Voltage Out of Range
P0A67 critical
HV Interlock Circuit
P0A68 critical
HV Interlock Circuit Performance
P0A69 critical
HV Interlock Circuit Low
P0A6A critical
HV Interlock Circuit High
P0A6B critical
HV Battery Charging System Control Module
P0A6C moderate
HV Battery Charging System Performance
P0A6D moderate
HV Battery Charge Rate Too Low
P0A6E critical
HV Battery Charge Rate Too High
P0A6F critical
HV Battery Internal Electronic Fault
P0A70 critical
Motor/Generator A Phase U Open
P0A71 critical
Motor/Generator A Phase V Open
P0A72 critical
Motor/Generator A Phase W Open
P0A73 critical
Motor/Generator B Phase U Open
P0A74 critical
Motor/Generator B Phase V Open
P0A75 critical
Motor/Generator B Phase W Open
P0A76 critical
Motor/Generator A Phase U Short to Ground
P0A77 critical
Motor/Generator A Phase V Short to Ground
P0A78 critical
Motor/Generator A Phase W Short to Ground
P0A79 critical
Motor/Generator B Phase U Short to Ground
P0A7A critical
Motor/Generator B Phase V Short to Ground
P0A7B critical
Motor/Generator B Phase W Short to Ground
P0A7C critical
Motor/Generator A Phase U to Phase V Short
P0A7D critical
Motor/Generator A Phase U to Phase W Short
P0A7E critical
Motor/Generator A Phase V to Phase W Short
P0A7F critical
Motor/Generator B Phase U to Phase V Short
P0A80 critical
HV Battery Pack Deterioration
P0A81 critical
Hybrid Battery Pack Coolant Flow Low
P0A82 critical
Hybrid Battery Pack Over Temperature
P0A83 critical
HV Battery Minimum State of Charge
P0A84 moderate
HV Battery Maximum State of Charge
P0A85 critical
HV Battery Module Voltage Out of Range
P0A86 moderate
14V Power Module System Performance
P0A87 critical
14V Power Module Overcurrent
P0A88 critical
14V Power Module Over Temperature
P0A89 moderate
HV Battery Capacity Estimation Circuit
P0A8A moderate
HV Battery Capacity Estimation Performance
P0A8B moderate
14V Power Module Voltage Low
P0A8C moderate
14V Power Module Voltage High
P0A8D critical
14V Power Module System Fault
P0A8E critical
Drive Motor A Inverter Output Performance
P0A8F critical
Drive Motor B Inverter Output Performance
P0A90 critical
Motor/Generator A Phase U to V Short - High Side
P0A91 critical
Motor/Generator A Phase U to W Short - High Side
P0A92 critical
Motor/Generator A Phase V to W Short - High Side
P0A93 critical
Inverter Drive Motor A Overcurrent
P0A94 critical
Inverter Drive Motor B Overcurrent
P0A95 moderate
HV Battery Charge Air Cooling System Performance
P0A96 moderate
HV Battery Charge Air Cooling Fan Control Circuit
P0A97 critical
Hybrid Drive Motor System Over Speed
P0A98 critical
HV Battery Discharge Rate Too High
P0A99 critical
HV Battery Charge Rate Excessive
P0AA0 critical
P0AA0 is a generic SAE J2012-defined powertrain trouble code that applies to hybrid and electric vehicles. It indicates a fault in the control circuit for the high-voltage battery's positive contactor. The contactor is a heavy-duty electrical relay that connects and disconnects the positive terminal of the high-voltage (traction) battery pack from the rest of the vehicle's high-voltage system. The hybrid/EV battery control module (variously called the Hybrid Control Module, BECM on Ford, or PHEV-ECU on Mitsubishi, depending on make) opens and closes this contactor to safely engage and isolate the pack. When the module detects that it cannot properly control or verify the state of the positive contactor circuit, it sets P0AA0. Because this code involves the high-voltage system, it is a safety-critical fault. The exact set criteria and component naming vary by manufacturer, so confirm the make-specific definition in the OEM service information for the vehicle before diagnosing. This is a high-voltage system: do not probe or service it without proper insulated tools, PPE, and de-energizing procedures.
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