What Does P0A41 Mean?
DTC P0A41 indicates the drive motor "A" position sensor circuit output is below the minimum expected signal level. In a resolver-based system, this typically means one or both of the resolver output signals have dropped below the minimum acceptable amplitude. This can be caused by an open circuit in the sensor winding, wiring damage, or a mechanical air gap issue. The low signal condition prevents the Hybrid Control Module from accurately determining rotor position, which is essential for proper motor commutation and torque control.
Safety Warning
A low position sensor signal can result in loss of motor control and inability to operate drive motor "A." The vehicle may be unable to provide electric drive power, and the transition to engine-only mode may be abrupt.
Common Causes
30%
Open circuit in the position sensor signal wiring or connector
25%
Failed position sensor with an open winding
20%
Excessive resolver air gap due to bearing wear or rotor displacement
15%
Corroded or damaged connector terminals reducing signal amplitude
10%
Inverter resolver excitation supply voltage too low
Diagnostic Steps
1
Step 1: Check the motor "A" position sensor live data on the scan tool. A fixed or near-zero position reading suggests a complete low signal condition.
2
Step 2: Inspect the position sensor connector at the motor for damage, corrosion, or disconnection. Check for moisture intrusion or contamination.
3
Step 3: Measure the resolver winding resistances at the sensor connector. Compare to specifications. An open reading on any winding confirms sensor failure.
4
Step 4: Check continuity of all signal and excitation wires from the sensor connector to the inverter/HCM connector. An open in any conductor will cause reduced or lost signal.
5
Step 5: If wiring and sensor resistance check out, use an oscilloscope to verify the excitation signal from the inverter is present and at the correct amplitude and frequency at the sensor connector.
Estimated Repair Cost
$350 - $2,200
Parts + labor, varies by vehicle and location
DTC P0A41 indicates the drive motor "A" position sensor circuit output is below the minimum expected signal level. In a resolver-based system, this typically means one or both of the resolver output signals have dropped below the minimum acceptable amplitude. This can be caused by an open circuit in...
The most common cause of P0A41 (Drive Motor "A" Position Sensor Circuit Low) is: Open circuit in the position sensor signal wiring or connector
Typical repair costs for P0A41 range from $350 to $2,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A low position sensor signal can result in loss of motor control and inability to operate drive motor "A." The vehicle may be unable to provide electric drive power, and the transition to engine-only mode may be abrupt.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0A41 to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drivetrain
Difficulty
Type
Generic (SAE)
Recommended Tools
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