What Does P0A68 Mean?
Drive Motor B Phase U current is reading above the expected maximum threshold. The hybrid control module has detected excessive current through Phase U of the secondary drive motor, indicating a possible shorted winding, shorted IGBT, or sensor error. This overcurrent condition risks thermal damage to the motor and inverter components.
Safety Warning
Overcurrent creates fire and component destruction risk. Do not operate — tow immediately.
Common Causes
30%
Partial short in Phase U stator winding of drive motor B
30%
Motor B inverter Phase U IGBT shorted
25%
Phase U current sensor reading erroneously high
15%
Phase U cable insulation breakdown on motor B circuit
Diagnostic Steps
1
Step 1: Review freeze frame — Phase U current for motor B significantly above V and W confirms U-specific overcurrent.
2
Step 2: With HV disabled, measure Phase U winding resistance on motor B versus V and W. Lower resistance on U indicates shorted turns.
3
Step 3: Megger test Phase U cable and winding to chassis ground. Below 1 megohm indicates failure.
4
Step 4: Test motor B inverter Phase U IGBT pair for collector-to-emitter short.
5
Step 5: Replace affected components and verify balanced operation.
Estimated Repair Cost
$800 - $4,000
Parts + labor, varies by vehicle and location
Drive Motor B Phase U current is reading above the expected maximum threshold. The hybrid control module has detected excessive current through Phase U of the secondary drive motor, indicating a possible shorted winding, shorted IGBT, or sensor error. This overcurrent condition risks thermal damage ...
The most common cause of P0A68 (Drive Motor "B" Phase U Current High) is: Partial short in Phase U stator winding of drive motor B
Typical repair costs for P0A68 range from $800 to $4,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Overcurrent creates fire and component destruction 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 P0A68 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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