What Does P0A58 Mean?
Drive Motor B current sensor circuit is reading higher than the expected maximum threshold. The hybrid control module detects the secondary drive motor current sensor signal exceeds the allowable upper limit, which could indicate a shorted sensor, shorted wiring, or excessive current draw from the motor itself. This condition may trigger power derating to protect the drivetrain.
Common Causes
35%
Short to voltage in the current sensor signal circuit wiring
30%
Failed drive motor B current sensor with shorted internal element
20%
Hybrid powertrain control module input circuit fault
15%
Electromagnetic interference from adjacent high-voltage cables affecting sensor signal
Diagnostic Steps
1
Step 1: Review live data for drive motor B current sensor — verify the signal reads above the maximum specification (typically above 4.8V). Record freeze frame conditions.
2
Step 2: Disconnect the current sensor connector and measure signal voltage at the HCM side — if still high, the wiring has a short to voltage. If it drops to near 0V, the sensor is faulty.
3
Step 3: Inspect all wiring between the current sensor and HCM for chafing against HV cables, pinched insulation, or melted connectors. Repair any damaged sections with appropriate shielded wire.
4
Step 4: Verify proper HV cable shielding and routing per OEM specifications — improperly routed or unshielded HV cables can induce false high readings on adjacent sensor circuits.
5
Step 5: If wiring is intact, replace the drive motor B current sensor. Clear codes and verify the sensor signal returns to the normal 0.5V–4.5V operating range during a test drive.
Estimated Repair Cost
$200 - $850
Parts + labor, varies by vehicle and location
Drive Motor B current sensor circuit is reading higher than the expected maximum threshold. The hybrid control module detects the secondary drive motor current sensor signal exceeds the allowable upper limit, which could indicate a shorted sensor, shorted wiring, or excessive current draw from the m...
The most common cause of P0A58 (Drive Motor "B" Current Sensor Circuit High) is: Short to voltage in the current sensor signal circuit wiring
Typical repair costs for P0A58 range from $200 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle may experience sudden power reduction. Do not drive at highway speeds until diagnosed, as incorrect current sensing can lead to motor overcurrent and potential component damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A58 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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