What Does P0A6B Mean?
Drive Motor B Phase V current is reading above the expected maximum threshold. Excessive current has been detected through Phase V of the secondary drive motor stator, indicating a potential shorted winding, shorted IGBT, or erroneous sensor reading. This overcurrent condition threatens motor and inverter integrity.
Safety Warning
Overcurrent poses fire risk. Do not operate — tow immediately.
Common Causes
30%
Partial short in Phase V stator winding of drive motor B
30%
Motor B inverter Phase V IGBT shorted
25%
Phase V current sensor reading artificially high
15%
Phase V cable insulation breakdown on motor B circuit
Diagnostic Steps
1
Step 1: Review freeze frame — motor B Phase V current significantly above U and W confirms overcurrent.
2
Step 2: With HV disabled, measure Phase V winding resistance versus U and W on motor B.
3
Step 3: Megger test Phase V to chassis ground at 500V.
4
Step 4: Test motor B inverter Phase V IGBTs for shorts.
5
Step 5: Replace affected components and confirm balanced operation.
Estimated Repair Cost
$800 - $4,000
Parts + labor, varies by vehicle and location
Drive Motor B Phase V current is reading above the expected maximum threshold. Excessive current has been detected through Phase V of the secondary drive motor stator, indicating a potential shorted winding, shorted IGBT, or erroneous sensor reading. This overcurrent condition threatens motor and in...
The most common cause of P0A6B (Drive Motor "B" Phase V Current High) is: Partial short in Phase V stator winding of drive motor B
Typical repair costs for P0A6B range from $800 to $4,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Overcurrent poses fire risk. Do not operate — tow immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A6B to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid Drive Motor System
Difficulty
Type
Generic (SAE)
Recommended Tools
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