AutoCodes – GMC – P0C84 GMC

P0C84 GMC Code - Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage

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: P0C84 GMC indicates Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage.
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 254

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 P0C84 GMC 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 less than -69°C (-92°F).

OBDII Code P0C84 GMC - Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage - AutoCodes.com — P0C84 GMC Code - Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0C84 GMC?

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 P0C84 GMC?

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 P0C84 GMC 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 P0C84 GMC code?

Need more information on how to fix the P0C84 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P0C84 2014 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage
P0C84 2015 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage
P0C84 2016 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage
P0C84 2017 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage
P0C84 2018 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage

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 P0C84 GMC Code

1. What does the OBDII code P0C84 mean on a GMC vehicle?

P0C84 indicates a problem with the Hybrid/EV Battery Temperature Sensor 8 Circuit, specifically that the voltage is higher than expected.

2. What are the common symptoms of the P0C84 code?

Symptoms may include reduced hybrid/EV performance, warning lights on the dashboard, poor fuel efficiency, or the vehicle entering a limp mode.

3. What causes the P0C84 code to appear?

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

4. Can I drive my GMC vehicle with the P0C84 code?

While the vehicle may still be drivable, continuing to drive with this code can lead to further damage or decreased hybrid/EV system performance. It is best to address the issue promptly.

5. How is the P0C84 code diagnosed?

A technician will use a scan tool to read the code, inspect the temperature sensor wiring and connections, and test the sensor for proper function.

6. How do you fix the P0C84 code on a GMC vehicle?

Fixes may include replacing the faulty temperature sensor, repairing or replacing damaged wiring, or reprogramming or replacing the hybrid battery control module.

7. What tools are needed to troubleshoot the P0C84 code?

Tools include an OBDII scanner, a digital multimeter for testing voltage and continuity, and possibly a thermal imaging device to check for abnormal battery temperatures.

8. How much does it cost to repair the P0C84 code?

Repair costs vary based on the cause but typically range from $100 to $500, depending on whether just the sensor needs replacement or additional components are affected.

9. Can a software update fix the P0C84 code?

In some cases, a software update for the hybrid battery control module might resolve the issue, but this depends on the specific vehicle and situation.

10. What happens if the P0C84 code is ignored?

Ignoring this code can lead to further damage to the hybrid/EV battery system, decreased vehicle performance, and potentially costly repairs in the future.