What Does P0C1A Mean?
DTC P0C1A indicates that the torque actually delivered by drive motor "B" does not match the commanded torque from the powertrain controller. This is the motor "B" equivalent of P0C19. The discrepancy between requested and actual torque output has exceeded the calibrated tolerance, which can result from electrical, mechanical, or calibration issues with the secondary drive motor or its inverter.
Safety Warning
Motor "B" torque performance issues can cause unpredictable torque split in AWD systems, leading to handling instability. The vehicle may underperform during acceleration, creating a safety hazard when entering traffic.
Common Causes
25%
Motor "B" position sensor offset error causing poor commutation efficiency
20%
Motor "B" stator winding degradation or partial inter-turn short
20%
Inverter "B" current sensor drift or calibration error
20%
Motor "B" bearing wear or mechanical drag
15%
Low inverter "B" supply voltage limiting torque output
Diagnostic Steps
1
Step 1: Review freeze-frame data comparing motor "B" commanded torque vs. actual, along with motor current, speed, inverter temperature, and HV bus voltage.
2
Step 2: Check for companion DTCs: P0C18 (position sensor not learned), P0C0E–P0C10 (inverter supply), P0C14–P0C16 (over-temperature). Address any related codes first.
3
Step 3: Perform the motor "B" position sensor relearn procedure. An incorrect offset is a common cause of torque deficit that is easily corrected.
4
Step 4: Measure motor "B" phase-to-phase resistance with the HV system de-energized. All three phase pairs should be balanced. Check insulation resistance to ground.
5
Step 5: Inspect motor "B" mechanically: listen for bearing noise during operation, check for signs of rotor contact with stator (scoring marks), and feel for drag when rotating by hand.
6
Step 6: Validate inverter "B" current sensor accuracy using an external HV current measurement device during a controlled test.
Estimated Repair Cost
$500 - $6,000
Parts + labor, varies by vehicle and location
DTC P0C1A indicates that the torque actually delivered by drive motor "B" does not match the commanded torque from the powertrain controller. This is the motor "B" equivalent of P0C19. The discrepancy between requested and actual torque output has exceeded the calibrated tolerance, which can result ...
The most common cause of P0C1A (Drive Motor "B" Torque Delivered Performance) is: Motor "B" position sensor offset error causing poor commutation efficiency
Typical repair costs for P0C1A range from $500 to $6,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Motor "B" torque performance issues can cause unpredictable torque split in AWD systems, leading to handling instability. The vehicle may underperform during acceleration, creating a safety hazard when entering traffic.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C1A to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor System
Difficulty
Type
Generic (SAE)
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