Damaged, chafed or corroded wiring to the motor position sensor (resolver or encoder) circuit; Loose, contaminated or water-affected connector at the motor or control unit; Faulty drive motor position sensor; Electrical interference or poor shielding or earthing of the sensor signal wiring; Fault within the motor control unit or inverter; Mechanical problem at the motor affecting the sensor mounting or rotor alignment.

P0C5E

Drive Motor A Position Sensor Circuit B Intermittent/Erratic.

Generic
Powertrain
Generic code
High severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
C: AreaHybrid propulsion
5E: FaultThe specific fault in that area

What it means

P0C5E is a generic powertrain code meaning the control unit has detected an intermittent or erratic signal from the position sensor circuit B on drive motor A in a hybrid or electric vehicle. The motor control unit saw the rotor position signal drop out, jump or give implausible values compared with expected motor behaviour. The exact sensor type and which circuit is 'B' depend on the manufacturer and model.

Symptoms

Warning lights on the dashboard, such as a hybrid or EV system fault light or the general malfunction light
Reduced power or the car going into a limp-home mode
Jerky, hesitant or uneven acceleration
Whining, rough running or vibration from the drive motor
Intermittent loss of drive or the car failing to move off
Hybrid system shutting down or the engine starting more often than normal

Possible causes

Damaged, chafed or corroded wiring to the motor position sensor (resolver or encoder) circuitlikely
Loose, contaminated or water-affected connector at the motor or control unitlikely
Faulty drive motor position sensorpossible
Electrical interference or poor shielding or earthing of the sensor signal wiringpossible
Fault within the motor control unit or inverterrare
Mechanical problem at the motor affecting the sensor mounting or rotor alignmentrare

How to diagnose

Read all stored and pending codes and record freeze frame data, noting when the fault set and under what conditions
Check for related motor, inverter or high-voltage system codes, and for any manufacturer bulletins or calibration updates for the model
Inspect the position sensor wiring and connectors visually for chafing, corrosion, water ingress, bent pins and poor retention, following the manufacturer's high-voltage safety procedure
Wiggle test the harness with the system live on the scan tool and watch the position signal for dropouts or spikes
Check the sensor circuit for continuity, resistance and shorts to earth or voltage against the manufacturer's specification, with the system safely isolated
Check the sensor signal and supply values against specification, as the procedure varies by model
Inspect the sensor mounting and motor for mechanical damage or looseness, as per the model's procedure

How to fix

Repair or replace damaged wiring in the position sensor circuit
Clean, repair or replace faulty connectors and terminals and seal against water ingress
Replace the drive motor position sensor, or the motor assembly where the sensor is not serviceable separately
Restore proper shielding and earth connections on the sensor circuit
Replace or update the motor control unit or inverter only after the wiring and sensor are proven good, and apply any manufacturer calibration update if one is known to address the fault

Can I keep driving?

High severity

Limit driving and have it checked promptly, as the car may lose drive without warning or drop into limp mode, which can be unsafe in traffic. High-voltage work should only be done by someone trained to do it.

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