P0364
DC/AC Converter Control Module Control Circuit Range/Performance.
- Generic
- Powertrain
- Generic code
- Medium severity
How this code is built
- P
- SystemPowertrain
- 0
- Defined bySAE, the same on every car
- 3
- AreaIgnition system or misfire
- 64
- FaultThe specific fault in that area
What it means
P0364 is listed as a DC/AC converter control module control circuit range/performance fault. The control unit that manages the converter (inverter) has seen its control circuit signal or response fall outside the expected range, or not match what it commanded. The converter changes high-voltage DC from the battery to AC, typically for a drive motor or other AC load, so this code only applies to vehicles fitted with one. Exact wording, set conditions and the module involved vary by model, so check the manufacturer's data for the vehicle.
Symptoms
- Hybrid or electric system warning light on the dash, plus the engine management light
- Reduced power or limp mode
- Loss of electric assist, or the vehicle will not enter ready or drive mode
- Poor or uneven acceleration
- Reduced or no operation of the electric drive or AC-powered functions
- Other related high-voltage or communication codes stored
Possible causes
- Damaged, corroded or loose wiring or connectors in the converter control circuitlikely
- Low or unstable 12 V supply or poor earth to the converter control modulelikely
- Fault inside the DC/AC converter or its control modulepossible
- Communication or network fault between the converter control module and other control unitspossible
- Cooling system fault for the converter causing an over-temperature or performance limitpossible
- Outdated or faulty control module software, where the manufacturer lists it as a known cause for the modelrare
- High-voltage battery or related component fault affecting converter operationrare
How to diagnose
- Read all stored and pending codes with freeze frame data, and note any related high-voltage, communication or cooling codes.
- Check the 12 V battery condition and charging, as low voltage can cause false control circuit faults.
- Visually inspect the converter control wiring, connectors and earths for damage, water ingress, corrosion or chafing. Do not touch orange high-voltage cabling or components unless qualified and the system is isolated.
- Check the converter cooling circuit for correct coolant level, pump operation and airflow, following the manufacturer's procedure.
- Check the manufacturer's data for the model for the circuit layout, set conditions and test values.
- With the system safely isolated by a suitably trained person, test the control circuit wiring for continuity, short circuits and resistance.
- Check live data for the converter commanded and actual values, and for network communication faults.
- Check for applicable software updates or technical bulletins for the model before condemning the converter.
How to fix
- Repair or replace damaged wiring, connectors or earths in the control circuit.
- Restore a healthy 12 V supply by charging or replacing the battery or repairing the charging fault.
- Repair the cooling circuit fault affecting the converter, such as coolant level, pump or blockage.
- Repair network or communication faults found on the vehicle.
- Replace the DC/AC converter or control module only after the wiring, supply and cooling are proven good and as the manufacturer directs.
- Update the control module software if the manufacturer lists an outdated calibration as a known cause for this vehicle.
Can I keep driving?
The car may be driveable in limp mode, but power can drop or be lost without warning, so avoid long journeys and get it checked soon. Stop driving if warnings are accompanied by loss of drive, burning smells or unusual noises, and have a high-voltage-trained technician inspect it.
Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.