P0DA3

What it means

P0DA3 means the hybrid or electric vehicle control unit has detected a fault in the circuit for voltage sensor A on the inverter serving drive motor B. The controller uses this sensor to monitor the high-voltage supply to the inverter. It set the code because the signal was out of range, implausible, or missing. The exact sensor location and the way motor B is arranged vary by model, so check the manufacturer's data for the vehicle.

Symptoms

• Hybrid or EV system warning light on the dashboard, often with the main warning light
• Reduced power or limp mode
• Loss of electric drive or the engine running more than normal on a hybrid
• Car refusing to enter ready mode or shutting down the drive system unexpectedly
• Reduced regenerative braking or poor efficiency
• Other inverter or drive motor codes stored alongside it

Possible causes

• Wiring or connector fault in the voltage sensor circuit (open circuit, short, corrosion, loose or damaged pin)likely
• Faulty inverter voltage sensor, or a fault in the sensing circuitry inside the inverter assemblylikely
• Inverter or motor control unit internal fault causing a false or missing sensor readingpossible
• Low 12-volt supply or poor earth affecting the control unit and sensor reference voltagepossible
• Water ingress or coolant leak affecting the inverter or its connectorsrare
• Damage to the high-voltage system from an impact or previous repairrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting any other inverter, motor, or high-voltage battery codes and the conditions when it set.
2. Check the 12-volt battery condition and charging, as low voltage can cause false circuit faults, and check for related software or service bulletins for the model.
3. Visually inspect the inverter wiring, connectors, and earths for damage, corrosion, moisture, chafing, or signs of previous repair, without touching any high-voltage components.
4. Use live data to compare the inverter voltage sensor reading with the battery voltage reading, with the system off and then in ready mode, to see whether it is stuck, erratic, or implausible.
5. Have a suitably trained technician isolate the high-voltage system following the manufacturer's procedure before any work on high-voltage parts.
6. With the system safely isolated, check the sensor circuit for continuity, short to earth, short to supply, and resistance, and check the reference voltage and earth, using the manufacturer's wiring data.
7. Check the inverter cooling circuit for leaks and correct coolant level, as the manufacturer specifies.
8. Clear the code, road test, and recheck to confirm whether the fault returns.

How to fix

• Repair or replace damaged wiring, terminals, or connectors in the sensor circuit.
• Replace the inverter assembly, or the sensor if the manufacturer supplies it separately, once testing confirms it is faulty.
• Correct low 12-volt battery voltage or poor earth connections, replacing the battery if it is weak.
• Repair any coolant or moisture ingress and dry or replace affected connectors.
• Update or reprogram the control unit software only where the manufacturer lists an outdated calibration as a known cause for this fault.

Can I keep driving?

Nearby codes

• P0DA2GenericBattery Charger A Coupler Lock Position Sensor Circuit Intermittent/Erratic
• P0DA4GenericDrive Motor B Inverter Voltage Sensor A” Circuit Range/Performance