Damaged wiring or poor connector contact in the position sensor circuit, such as chafing, corrosion or a loose pin; Open circuit or short to earth in the circuit C signal wire; Faulty drive motor position sensor (resolver or equivalent); Fault inside the motor control unit or inverter that reads or supplies the sensor signal; Moisture or coolant ingress into the sensor connector or motor housing; Mechanical damage or misalignment of the sensor or its rotor target after previous repair work.

P0CDC

Drive Motor A Position Sensor Circuit C Low.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
DC: FaultThe specific fault in that area

What it means

P0CDC means the control unit for the hybrid or electric drive system has detected a low signal on circuit C of the position sensor for drive motor A. This sensor, often a resolver or similar rotor position sensor, tells the controller the exact rotor angle so it can time the motor current correctly. The code sets when the voltage or signal on that circuit stays below the expected range. Which wire or signal is 'circuit C' depends on the model, so check the manufacturer's data.

Symptoms

Hybrid or EV system warning light, or malfunction indicator lamp on
Reduced power or limp-home mode
Car refuses to enter Ready mode or will not move
Rough, jerky or juddering drive from the motor
Engine starts and stops erratically on a hybrid, or the motor cuts out suddenly

Possible causes

Damaged wiring or poor connector contact in the position sensor circuit, such as chafing, corrosion or a loose pinlikely
Open circuit or short to earth in the circuit C signal wirelikely
Faulty drive motor position sensor (resolver or equivalent)possible
Fault inside the motor control unit or inverter that reads or supplies the sensor signalpossible
Moisture or coolant ingress into the sensor connector or motor housingpossible
Mechanical damage or misalignment of the sensor or its rotor target after previous repair workrare

How to diagnose

Read all stored codes and freeze frame data, and note any other drive motor, inverter or communication codes
Check for known manufacturer service information or software updates for this model and code
Make sure the high-voltage system is made safe by a suitably trained person before any work near orange cables or the motor
Visually inspect the sensor wiring and connectors for chafing, corrosion, water, bent or pushed-out pins
Check the sensor circuit for continuity, short to earth and short to other wires, using the wiring diagram for the model
Measure the sensor winding resistance and compare it with the manufacturer's specification
Review live data for motor position or speed signals while turning the motor, if the model allows it
Clear the code after repair and road test to confirm it does not return

How to fix

Repair or replace damaged wiring and renew corroded or damaged connectors
Fix the short to earth or open circuit found in circuit C
Replace the drive motor position sensor if it is out of specification, and set it up as the manufacturer requires
Repair or replace the motor control unit or inverter only once the wiring and sensor are proven good
Dry out and seal the connector area and fix the source of any water or coolant ingress

Can I keep driving?

High severity

Avoid driving the car. A fault in the motor position signal can cause sudden loss of drive power or erratic motor behaviour, so have it recovered or inspected by a technician trained in hybrid and electric systems.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.