What Does P0C5C Mean?
This code indicates the voltage signal from drive motor "A" position sensor circuit "B" has dropped below the minimum threshold programmed in the powertrain controller. This is a definitive electrical fault—either the circuit has a short to ground, an open signal wire, or the sensor itself has failed with a low output. Since motor A is the primary traction motor, this fault will significantly impact vehicle drivability.
Safety Warning
Low signal on the primary drive motor position sensor circuit can cause motor miscommutation, potentially resulting in loss of motive power or uncontrolled torque. The vehicle will likely enter reduced power mode. Do not operate until repaired.
Common Causes
32%
Short to ground in the circuit B signal wiring
26%
Open circuit or broken wire in the circuit B harness
22%
Failed position sensor with collapsed circuit B output
13%
Water intrusion or corrosion in the sensor connector pulling the signal low
7%
Controller input circuit failure on the circuit B channel
Diagnostic Steps
1
Inspect the circuit B connector pins for corrosion, moisture, or physical damage—these sensors often reside in harsh environments near the motor.
2
Measure the excitation voltage supplied to the sensor to confirm the reference signal is present and within specification.
3
Test for short to ground on each circuit B signal wire by measuring resistance from each wire to chassis ground with the sensor disconnected.
4
Verify continuity of each circuit B wire from the sensor connector to the controller connector.
5
If the harness is intact, measure the sensor B winding resistance—a reading significantly below specification confirms an internal sensor fault.
Estimated Repair Cost
$300 - $1,800
Parts + labor, varies by vehicle and location
This code indicates the voltage signal from drive motor "A" position sensor circuit "B" has dropped below the minimum threshold programmed in the powertrain controller. This is a definitive electrical fault—either the circuit has a short to ground, an open signal wire, or the sensor itself has faile...
The most common cause of P0C5C (Drive Motor "A" Position Sensor Circuit "B" Low) is: Short to ground in the circuit B signal wiring
Typical repair costs for P0C5C range from $300 to $1,800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Low signal on the primary drive motor position sensor circuit can cause motor miscommutation, potentially resulting in loss of motive power or uncontrolled torque. The vehicle will likely enter reduced power mode. Do not operate until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0C5C to identify the root cause.
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Quick Info
Category
Powertrain
System
Hybrid/EV Drive Motor System
Difficulty
Type
Generic (SAE)
Recommended Tools
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