A damaged or chafed wire in the position sensor harness, often near a connector or where the loom flexes; Corrosion or poor pin tension inside the sensor connector, causing an intermittent connection; A failing position sensor itself, such as a cracked circuit board or worn internal contacts; Electrical interference from a nearby high-voltage cable or a poor ground connection; Loose or damaged motor housing ground strap, leading to a floating reference voltage; A faulty controller or inverter assembly that misreads an otherwise good sensor signal; Debris or metallic particles on the sensor pickup, disturbing the magnetic field

DTC codes / P0Cxx · Hybrid propulsion / P0C54

P0C54Drive Motor A Position Sensor Circuit A Circuit Intermittent/Erratic

P0C54 indicates that the controller for Drive Motor A has detected an intermittent or erratic signal from the position sensor circuit that reports the motor's rotor angle. The computer expects a smooth, continuous voltage or digital pattern as the motor turns, and it flags this code when that signal drops out, jumps, or becomes noisy in a way that does not match the motor's commanded speed.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaHybrid propulsion

Symptoms you may notice

Illumination of the hybrid or electric vehicle warning light, often with no other noticeable symptoms
Intermittent loss of propulsion or a sudden reduction in power while driving
Rough operation or shuddering from the drive motor during acceleration or deceleration
The vehicle may enter a limp-home mode or refuse to restart after a stop
Unusual noises or vibration from the motor area, though this is less common
A stored freeze-frame showing the fault occurred at a specific motor speed or temperature

Common causes, most likely first

A damaged or chafed wire in the position sensor harness, often near a connector or where the loom flexes
Corrosion or poor pin tension inside the sensor connector, causing an intermittent connection
A failing position sensor itself, such as a cracked circuit board or worn internal contacts
Electrical interference from a nearby high-voltage cable or a poor ground connection
Loose or damaged motor housing ground strap, leading to a floating reference voltage
A faulty controller or inverter assembly that misreads an otherwise good sensor signal
Debris or metallic particles on the sensor pickup, disturbing the magnetic field

How to diagnose and fix it

Inspect the position sensor harness and connector for chafing, corrosion, or loose pins, and repair as needed
Check the motor housing ground strap and all related ground points for tightness and cleanliness
Measure the sensor circuit resistance and voltage drop while wiggling the harness to catch intermittent faults
Use a scan tool to view live position sensor data and compare it with commanded motor speed for dropouts or spikes
Perform a continuity and short-to-ground test on each wire in the sensor circuit, including the shield if present
Replace the position sensor if the wiring and grounds are proven good but the signal remains erratic
If the sensor and wiring are confirmed good, diagnose the controller or inverter for internal signal processing faults

Intermittent faults hide in the harness

A common mistake is replacing the position sensor immediately, when a chafed wire or corroded connector pin is the actual cause in many cases.
The code can set from electrical noise rather than a hard failure, so a poor ground or a loose high-voltage cable shield may be the real culprit.
Freeze-frame data often shows the fault occurred at a specific motor speed or temperature, which can point to a mechanical or thermal issue rather than a wiring problem.
Some controllers log this code after a low-voltage event or a jump start, and clearing it after a full battery charge may prevent a unnecessary repair.
A failing sensor may still produce a plausible-looking signal on a basic scan tool, so oscilloscope testing of the waveform is often needed to catch erratic behavior.

Can I keep driving with P0C54?

It is not safe to ignore this code because an erratic position signal can cause a sudden loss of propulsion or a limp-home event. Avoid sustained highway driving and heavy acceleration until the fault is diagnosed, and have the vehicle checked promptly.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.