AutoCodes – Generic – P0C4B

P0C4B Code - Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open

Quick Answer

The Engine Control Module (ECM) monitors the Hybrid Battery Pack Coolant Pump. Common causes include Faulty Hybrid Battery Pack Coolant Pump, Hybrid Battery Pack Coolant Pump harness is open or shorted, Hybrid Battery Pack Coolant Pump 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: P0C4B indicates Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open.
Common causes: Common causes include Faulty Hybrid Battery Pack Coolant Pump, Hybrid Battery Pack Coolant Pump harness is open or shorted, Hybrid Battery Pack Coolant Pump 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 1,494

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 P0C4B Description

The Engine Control Module (ECM) monitors the Hybrid Battery Pack Coolant Pump. The ECM sets the OBDII code when the Hybrid Battery Pack Coolant Pump is not to factory specifications.

OBDII Code P0C4B - Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open - AutoCodes.com — P0C4B Code - Hybrid Battery Pack Coolant Pump Supply Voltage Circuit/Open

What does this mean?

What are the Possible Causes of the DTC P0C4B?

Faulty Hybrid Battery Pack Coolant Pump
Hybrid Battery Pack Coolant Pump harness is open or shorted
Hybrid Battery Pack Coolant Pump circuit poor electrical connection

How to Fix the DTC P0C4B?

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 P0C4B 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.