What Does P0A5E Mean?
Drive Motor A Phase U current is reading below the expected minimum threshold. The hybrid control module detects that the Phase U stator current in the primary drive motor is abnormally low during commanded motor operation. This could indicate a Phase U winding open circuit, a disconnected phase cable, or a failed current sensor reading low.
Safety Warning
Operating with a single open phase causes severe motor vibration, torque pulsation, and potential motor damage. Do not drive — tow to a qualified hybrid service facility.
Common Causes
35%
Open circuit in Phase U stator winding of drive motor A
25%
Phase U current sensor failure reading low within the inverter
25%
Disconnected or high-resistance Phase U power cable connection
15%
Inverter Phase U IGBT not switching properly (stuck open)
Diagnostic Steps
1
Step 1: Compare Phase U current with Phase V and W in live data — if U reads near zero while V and W show normal current, confirm a Phase U-specific fault.
2
Step 2: With HV system de-energized and safety protocols in place, measure continuity of Phase U winding from the motor terminal to the neutral point. An open circuit reading confirms a broken winding.
3
Step 3: Inspect the Phase U high-voltage cable and both ends (inverter and motor terminals) for loose bolts, corrosion, or heat damage. Torque connections to OEM specification.
4
Step 4: If winding and cable are intact, the inverter Phase U current sensor or IGBT is likely at fault. Test IGBT gate-to-emitter and collector-to-emitter with a multimeter for shorts or opens.
5
Step 5: Replace the faulty component (motor assembly if winding is open, inverter if sensor/IGBT is failed). Clear codes and perform a motor function test to verify balanced three-phase operation.
Estimated Repair Cost
$500 - $3,500
Parts + labor, varies by vehicle and location
Drive Motor A Phase U current is reading below the expected minimum threshold. The hybrid control module detects that the Phase U stator current in the primary drive motor is abnormally low during commanded motor operation. This could indicate a Phase U winding open circuit, a disconnected phase cab...
The most common cause of P0A5E (Drive Motor "A" Phase U Current Low) is: Open circuit in Phase U stator winding of drive motor A
Typical repair costs for P0A5E range from $500 to $3,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Operating with a single open phase causes severe motor vibration, torque pulsation, and potential motor damage. Do not drive — tow to a qualified hybrid service facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A5E to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Hybrid Drive Motor System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
