What Does P0A6C Mean?
The hybrid control module has detected a general malfunction in the Phase W current measurement of Drive Motor B. The Phase W current sensor or the winding on the secondary drive motor is reporting values outside normal operating parameters, affecting motor control accuracy and potentially indicating a developing failure.
Safety Warning
Phase current anomalies cause overheating and torque instability. Tow to a hybrid repair facility.
Common Causes
35%
Faulty Phase W current sensor in motor B inverter assembly
25%
Damaged Phase W stator winding in drive motor B
25%
Motor B inverter IGBT degradation on Phase W leg
15%
Phase W cable or connector fault on motor B circuit
Diagnostic Steps
1
Step 1: Monitor motor B Phase U, V, and W currents in live data. Look for Phase W deviating more than 5%.
2
Step 2: With HV de-energized, measure Phase W winding resistance on motor B versus U and V.
3
Step 3: Perform insulation resistance test on Phase W winding to housing.
4
Step 4: Inspect Phase W cable and connectors for physical damage.
5
Step 5: If motor and wiring pass, the motor B inverter Phase W section needs service.
Estimated Repair Cost
$500 - $3,000
Parts + labor, varies by vehicle and location
The hybrid control module has detected a general malfunction in the Phase W current measurement of Drive Motor B. The Phase W current sensor or the winding on the secondary drive motor is reporting values outside normal operating parameters, affecting motor control accuracy and potentially indicatin...
The most common cause of P0A6C (Drive Motor "B" Phase W Current) is: Faulty Phase W current sensor in motor B inverter assembly
Typical repair costs for P0A6C range from $500 to $3,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Phase current anomalies cause overheating and torque instability. Tow to a hybrid repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A6C to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Drive Motor System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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