Drive Motor Position Sensor Circuit Low
The P0C5C code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the drive motor position sensor circuit. This sensor is critical for monitoring the rotor position of the electric drive motor, enabling precise control of motor torque and speed. A low voltage reading suggests a short to ground, open circuit, or faulty sensor, which can disrupt hybrid/electric vehicle operation.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced motor power or limp mode
- Hesitation or jerking during acceleration
- Hybrid system warning messages
2. Most Common Causes
- Faulty or misaligned traction motor position sensor A (resolver or Hall sensor)
- Short to ground in the sensor circuit B wiring
- Open circuit or excessive resistance in circuit B wiring or connectors
- Corroded, oxidized, or damaged pins in the sensor connector
- Internal failure of the inverter or drive motor control module (if sensor is integrated)
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to verify P0C5C and check for related codes.
Step 2: Visually inspect the sensor connector and wiring for damage, corrosion, or loose connections.
Step 3: Measure sensor reference voltage (typically 5V) and ground at the connector.
Step 4: Test sensor output signal voltage while rotating the motor manually (if accessible).
Step 5: If signal is out of range, replace the drive motor position sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not recommended. The vehicle may enter limp mode, reducing power and potentially causing unsafe driving conditions. Have it diagnosed promptly.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts (sensor) and labor. Diagnostic fees may add $50-$100.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.