AutoCodes – Generic – P0C4F

P0C4F Code - Drive Motor 'B' Position Exceeded Learning Limit

Quick Answer

The motor resolver is a type of sensor that detects the position of the magnetic poles, which are indispensable for ensuring the highly efficient control of the MG1 and MG2. Common causes include Faulty Hybrid vehicle motor, Hybrid vehicle motor harness is open or shorted, Hybrid vehicle motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0C4F indicates Drive Motor 'B' Position Exceeded Learning Limit.
Common causes: Common causes include Faulty Hybrid vehicle motor, Hybrid vehicle motor harness is open or shorted, Hybrid vehicle motor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 3,187

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0C4F Description

The motor resolver is a type of sensor that detects the position of the magnetic poles, which are indispensable for ensuring the highly efficient control of the MG1 and MG2.
The stator of the resolver contains an excitation coil and two detection coils. Because the rotor has an oval shape, the gap between the stator and the rotor changes as the rotor turns. An alternating current with a predetermined frequency flows through the excitation coil, and detection coils S and C output alternating currents in accordance with the position of the sensor rotor.
The HV control ECU detects the absolute position of the rotor in accordance with the phases of detection coils S and C and the height of their waveform. Furthermore, the CPU calculates the amount of change in the position within a predetermined length of time, in order to use the resolver as a speed sensor.

OBDII Code P0C4F - Drive Motor 'B' Position Exceeded Learning Limit - AutoCodes.com — P0C4F Code - Drive Motor 'B' Position Exceeded Learning Limit

What does this mean?

What are the Possible Causes of the DTC P0C4F?

Faulty Hybrid vehicle motor
Hybrid vehicle motor harness is open or shorted
Hybrid vehicle motor circuit poor electrical connection
Faulty HV control ECU

How to Fix the DTC P0C4F?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0C4F code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.