AutoCodes – Generic – P0C8C

P0C8C Code - Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic

Quick Answer

Hybrid/EV Battery Temperature Sensors are used to monitor the battery temperature. Common causes include Faulty Hybrid/EV Battery Assembly, Hybrid/EV Battery Assembly harness is open or shorted, Hybrid/EV Battery Assembly 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: P0C8C indicates Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic.
Common causes: Common causes include Faulty Hybrid/EV Battery Assembly, Hybrid/EV Battery Assembly harness is open or shorted, Hybrid/EV Battery Assembly 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 349

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 Mar 22, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0C8C Description

Hybrid/EV Battery Temperature Sensors are used to monitor the battery temperature. The non-serviceable battery temperature sensors are located within the battery sections. Two temperature sensors are located in each battery section. The temperature sensor is a variable resistor that measures the temperature of the battery cell group. The hybrid/EV interface control module supplies 5 V to the signal circuit and is a ground for the low reference circuit. The battery temperature sensor resistance changes with battery temperature. As the temperature decreases, the sensor resistance increases. As the temperature increases, the sensor resistance decreases.
Each Hybrid/EV Battery Interface Control Module communicates the temperature sensor values to the Hybrid/EV Powertrain Control Module via serial data.
The Hybrid/EV Powertrain Control Module uses the battery temperature sensors to determine the Hybrid/EV Battery Module temperature in order to control the battery cooling system operation.
The Diagnostic Trouble Code (DTC) will be set when the hybrid battery temperature sensor is intermittent or has changed by 10°C (18°F) or greater for 4 out of 5 seconds.

OBDII Code P0C8C - Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic - AutoCodes.com — P0C8C Code - Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic

What does this mean?

What are the Possible Causes of the DTC P0C8C?

Faulty Hybrid/EV Battery Assembly
Hybrid/EV Battery Assembly harness is open or shorted
Hybrid/EV Battery Assembly circuit poor electrical connection
Faulty Hybrid/EV Battery Interface Control Module

How to Fix the DTC P0C8C?

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 P0C8C 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 P0C8C code?

Need more information on how to fix the P0C8C code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P0C8C Buick — Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic
P0C8C Cadillac — Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic
P0C8C Chevrolet — Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic
P0C8C GMC — Hybrid/EV Battery Temperature Sensor 9 Circuit Erratic

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.

Frequently Asked Questions about P0C8C Code

1. What does the OBDII code P0C8C mean?

The P0C8C code indicates an issue with the Hybrid/EV Battery Temperature Sensor 9 circuit, specifically that its readings are erratic or inconsistent.

2. What are the common symptoms of the P0C8C code?

Symptoms may include an illuminated check engine light, reduced hybrid or EV performance, overheating of the battery, or the vehicle entering limp mode.

3. What causes the P0C8C code to appear?

Common causes include a faulty battery temperature sensor, damaged wiring or connectors, or a malfunctioning hybrid battery control module.

4. Can I drive my car with the P0C8C code?

Driving with this code is not recommended, as it could lead to battery overheating or reduced vehicle performance, potentially causing further damage.

5. How is the P0C8C code diagnosed?

A technician will use a scan tool to verify the code, inspect the temperature sensor and its wiring, and check for erratic signals or other related codes.

6. How can I fix the P0C8C code?

Repairs may involve replacing the faulty temperature sensor, repairing or replacing damaged wiring or connectors, or reprogramming the hybrid battery control module.

7. How much does it cost to repair the P0C8C code?

Repair costs can range from $150 to $500, depending on whether the issue lies with the sensor, wiring, or the control module.

8. Can a low hybrid battery charge cause the P0C8C code?

While a low charge generally doesn't trigger this code, it could exacerbate issues if the battery is overheating due to a faulty temperature sensor.

9. Is the P0C8C code specific to certain vehicle makes?

No, this code can appear in any hybrid or electric vehicle equipped with an OBDII system, though the specific sensor and repair procedures may vary by manufacturer.

10. Can I reset the P0C8C code without repairs?

While clearing the code with a scan tool might temporarily turn off the warning light, the issue will likely return unless the underlying problem is resolved.