P0A00 to P0A13: hybrid motor electronics cooling and DC/DC converter
In a hybrid, the temperature sensor or the pump of the separate coolant circuit for the motor electronics has a fault, or the DC/DC converter's status or enable circuit reads wrong.
SeverityHighCarrying on can cause expensive damage, so deal with it now.
Can you keep driving?Only as far as the workshopWhat does P0A00 mean?
A hybrid's inverter and motor electronics run hot, so they usually have their own coolant circuit with an electric pump and a temperature sensor. If that circuit cannot be read or the pump cannot be driven, the hybrid system limits power to protect the electronics. The DC/DC converter takes the place of a conventional alternator: it charges the small auxiliary battery that runs the lights and the computers and starts the hybrid system. If it stops, the auxiliary battery runs down while you drive, and the car can shut down.
What causes P0A00?
- A failed electric coolant pump for the inverter circuit
- Low coolant in the inverter circuit, which has its own reservoir on many hybrids
- A failed coolant temperature sensor or its wiring
- A DC/DC converter fault, often inside the inverter assembly
- A damaged connector or a blown fuse in the converter's control circuit
What to check first for P0A00
- Check the level in the inverter coolant reservoir, separately from the engine's
- Listen for the inverter pump running with the system on, or have it tested
- Check the auxiliary battery voltage with the system on and off: it should rise when the system is on
- Leave high voltage work to a workshop trained for hybrids
Can you drive with P0A00?
Drive only to a workshop, and only if the car is not in reduced power. If the auxiliary battery warning is on, the car may shut down when that battery runs out, so do not drive at night or on busy roads with it on; have it towed instead.
In states with an OBD-II emissions inspection, a car with the check engine light on fails the test until the fault is fixed.
Codes on this page
14
- P0A00Motor Electronics Coolant Temperature Sensor Circuit
- P0A01Motor Electronics Coolant Temperature Sensor Circuit Range/Performance
- P0A02Motor Electronics Coolant Temperature Sensor Circuit Low
- P0A03Motor Electronics Coolant Temperature Sensor Circuit High
- P0A04Motor Electronics Coolant Temperature Sensor Circuit Intermittent
- P0A05Motor Electronics Coolant Pump Control Circuit/Open
- P0A06Motor Electronics Coolant Pump Control Circuit Low
- P0A07Motor Electronics Coolant Pump Control Circuit High
- P0A08DC/DC Converter Status Circuit
- P0A09DC/DC Converter Status Circuit Low Input
- P0A10DC/DC Converter Status Circuit High Input
- P0A11DC/DC Converter Enable Circuit/Open
- P0A12DC/DC Converter Enable Circuit Low
- P0A13DC/DC Converter Enable Circuit High
Related codes
Checked on · Rafael Soares
These are the generic meanings every manufacturer shares. Each brand adds its own detail, so your car's handbook, its service information and a qualified mechanic have the last word. OdoKeep has no connection with any manufacturer, and the app does not read codes from the car.
