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P0C84 2018 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage

Quick Answer

The diagnostic trouble code P0C84 for a 2018 GMC Sierra indicates an issue with the Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage. Common causes include Faulty Temperature Sensor: A malfunctioning temperature sensor can send incorrect readings to the vehicle's computer system, triggering the high voltage circuit code, Wiring Issues: Damaged or corroded wiring connecting the sensor to the computer can disrupt the signal and cause the code to be set, Poor Connection: Loose or poor connections between the sensor and the circuit can lead to intermittent signals and trigger the code. 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 2018 GMC Sierra indicates Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage.
Common causes
Common causes include Faulty Temperature Sensor: A malfunctioning temperature sensor can send incorrect readings to the vehicle's computer system, triggering the high voltage circuit code, Wiring Issues: Damaged or corroded wiring connecting the sensor to the computer can disrupt the signal and cause the code to be set, Poor Connection: Loose or poor connections between the sensor and the circuit can lead to intermittent signals and trigger the code.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0C84 2018 GMC Sierra Description

The diagnostic trouble code P0C84 for a 2018 GMC Sierra indicates an issue with the Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage. This sensor is responsible for monitoring the temperature of the hybrid or electric vehicle battery pack. When the sensor detects a high voltage in the circuit, it triggers this code to alert the vehicle's onboard computer system of a potential problem.

OBDII Code P0C84 2018 GMC Sierra - Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage
P0C84 2018 GMC Sierra Code - Hybrid/EV Battery Temperature Sensor 8 Circuit High Voltage

Common Causes of P0C84 2018 GMC Sierra

  1. Faulty Temperature Sensor: A malfunctioning temperature sensor can send incorrect readings to the vehicle's computer system, triggering the high voltage circuit code.
  2. Wiring Issues: Damaged or corroded wiring connecting the sensor to the computer can disrupt the signal and cause the code to be set.
  3. Poor Connection: Loose or poor connections between the sensor and the circuit can lead to intermittent signals and trigger the code.
  4. Battery Pack Issues: Problems with the battery pack itself, such as overheating due to internal faults, can also cause the sensor to detect high voltage levels.

Symptoms of P0C84 2018 GMC Sierra

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Performance: The vehicle may experience a decrease in performance, such as reduced acceleration or power output.
  3. Battery Overheating Warning: Some vehicles may display a warning message indicating that the battery is overheating.
  4. Erratic Battery Charging: The hybrid or electric vehicle may exhibit erratic behavior in terms of battery charging, leading to inconsistent energy storage and usage.

How to Fix P0C84 2018 GMC Sierra

  1. Diagnostic Scan: Begin by performing a diagnostic scan to confirm the presence of the P0C84 code and identify any other related codes or issues.
  2. Inspect Sensor and Wiring: Check the condition of the temperature sensor and its wiring for any signs of damage, corrosion, or loose connections.
  3. Replace Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  4. Repair Wiring: Repair or replace any damaged wiring connecting the sensor to the vehicle's computer system.
  5. Clear Codes: After completing the repair, clear the diagnostic trouble codes from the vehicle's system and test to ensure the issue has been resolved.

Cost to Fix P0C84 2018 GMC Sierra

The typical repair costs for addressing the P0C84 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing the temperature sensor can range from $100 to $300, including parts and labor. If wiring repairs are necessary, additional costs may apply. It's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also impact the overall repair costs. For a more accurate estimate, it's recommended to consult with a local auto repair shop.

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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.

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