AutoCodes – Generic – P0C3B

P0C3B Code - DC/DC Converter Temperature Sensor 'A' High

Quick Answer

The MG ECU detects the temperature of the boost converter using the temperature sensor built into the boost converter. Common causes include Faulty Inverter with converter assembly. 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: P0C3B indicates DC/DC Converter Temperature Sensor 'A' High.
Common causes: Common causes include Faulty Inverter with converter assembly.
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 1,704

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 P0C3B Description

The MG ECU detects the temperature of the boost converter using the temperature sensor built into the boost converter. The boost converter using the temperature sensor outputs voltage which changes between 0.5 and 4.5 V in response to a change in temperature. The higher the boost converter temperature, the lower the output voltage. Conversely, the lower the boost converter temperature, the higher the output voltage. The MG ECU limit load based on signals sent from the boost converter temperature sensor to help prevent overheating. The MG ECU also detects malfunctions in the boost converter temperature sensor and its wiring.

OBDII Code P0C3B - DC/DC Converter Temperature Sensor 'A' High - AutoCodes.com — P0C3B Code - DC/DC Converter Temperature Sensor 'A' High

What does this mean?

What are the Possible Causes of the DTC P0C3B?

Faulty Inverter with converter assembly

How to Fix the DTC P0C3B?

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 P0C3B 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.

Need more information about the P0C3B code?

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Information for Specific Makes

P0C3B Lexus — DC/DC Converter Temperature Sensor 'A' High
P0C3B Toyota — DC/DC Converter Temperature Sensor 'A' High

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.