P0364

Code

Generic P — Powertrain

DC/AC Converter Control Module Control Circuit Range/Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 52 RU: 35

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Malfunction Indicator Lamp (MIL) or warning light illuminated
Reduced or no operation of systems powered by DC/AC converter (accessories, HVAC blower, auxiliary AC outputs)
Intermittent loss of accessory power or reduced charging function
Possible limp-home mode or reduced hybrid/EV performance on some vehicles
Stored related diagnostic trouble codes (DTCs)

Read and record freeze frame and all stored DTCs; clear codes and attempt to reproduce
Verify main battery/traction pack and 12V system voltage and health
Visually inspect converter and control module connectors for corrosion, burnt pins, or water intrusion
Check fuses and relays for the converter control circuit
Backprobe control and feedback wires at the converter and ECU while operating (use appropriate safety precautions)
Perform a wiggle test on wiring harness while monitoring signals to find intermittent faults

Control signal typically a switched/PWM or logic-level control from the vehicle control module (expected to switch between 0 V and system logic voltage; duty cycle varies with command)
Feedback/monitor signal may be an analog voltage (commonly 0–5 V) or a monitored current/position signal; should be steady or follow commanded changes
Power supply to converter electronics should be battery/pack voltage (vehicle-specific) and stable with ignition ON and during operation
Look for clean square/PWM waveforms on control line, stable feedback voltage, and no intermittent dropouts

Retrieve all codes and freeze-frame data; note conditions when P0364 set. Erase codes and perform a road or functional test to attempt to re-create.
Verify battery and 12V system voltage are within specified ranges; charge or service battery as needed.
Visually inspect wiring, connectors, fuses and relays for the converter control circuit. Repair any corrosion, damage or poor connections.
With vehicle OFF and service manual wiring diagrams available, check continuity and resistance of control and feedback wires between ECU and DC/AC converter; check for shorts to battery and ground.
With appropriate safety procedures for high-voltage systems, backprobe control and feedback circuits with key ON/engine OFF and during operation. Use a multimeter and oscilloscope to confirm voltage levels, PWM frequency and duty cycle match manufacturer specs.
If wiring and supply are good, consider swapping or bench-testing the DC/AC converter control module or the vehicle control module only if a known-good unit and proper immobilizer/service procedures are available.
Check for and apply any software updates or TSBs related to converter control. Clear codes and retest. If code returns, follow manufacturer module replacement and programming procedures.
If repair requires high-voltage component replacement or advanced programming, refer to dealer or qualified hybrid/EV technician.