AutoCodes – GMC – P0C85 GMC

P0C85 GMC Code - Hybrid/EV Battery Temperature Sensor 8 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: P0C85 GMC indicates Hybrid/EV Battery Temperature Sensor 8 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 308

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 P0C85 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 intermittent or has changed by 10°C (18°F) or greater for 4 out of 5 seconds.

OBDII Code P0C85 GMC - Hybrid/EV Battery Temperature Sensor 8 Circuit Erratic - AutoCodes.com — P0C85 GMC Code - Hybrid/EV Battery Temperature Sensor 8 Circuit Erratic

What does this mean?

What are the Possible Causes of the DTC P0C85 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 P0C85 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 P0C85 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 P0C85 GMC code?

Need more information on how to fix the P0C85 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P0C85 2014 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit Erratic
P0C85 2015 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit Erratic
P0C85 2016 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit Erratic
P0C85 2017 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 Circuit Erratic
P0C85 2018 GMC Sierra — Hybrid/EV Battery Temperature Sensor 8 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 P0C85 GMC Code

1. What does OBDII code P0C85 mean on a GMC vehicle?

Code P0C85 indicates an issue with the Hybrid/EV Battery Temperature Sensor 8 Circuit, specifically an erratic signal from the sensor.

2. What are the common symptoms of code P0C85 on a GMC?

Symptoms may include reduced hybrid or EV performance, warning lights on the dashboard, limited battery charging, or overheating of the hybrid/EV battery.

3. What causes code P0C85 on a GMC?

This code can be caused by a faulty temperature sensor, damaged wiring or connectors in the sensor circuit, or issues within the battery management system.

4. Can I drive my GMC with code P0C85?

Driving with this code is not recommended, as it may lead to battery overheating or reduced efficiency, potentially causing further damage to the hybrid or EV system.

5. How do I diagnose code P0C85 on a GMC?

Diagnosis typically involves inspecting the battery temperature sensor circuit for loose connections, damaged wiring, and testing the sensor for proper functionality using a multimeter.

6. How is code P0C85 fixed on a GMC?

Repairs may involve replacing the faulty temperature sensor, repairing damaged wiring or connectors, or recalibrating the battery management system.

7. Is code P0C85 specific to GMC hybrid or EV models?

Yes, this code is specific to GMC hybrid or EV models equipped with multiple battery temperature sensors.

8. What tools are needed to diagnose and fix code P0C85?

Common tools include an OBDII scanner, multimeter, and wiring diagrams specific to the vehicle model for troubleshooting the sensor circuit.

9. What is the cost of repairing code P0C85 on a GMC?

The repair cost varies depending on the issue but typically ranges from $150 to $500 for sensor replacement or wiring repairs.

10. Can a software update fix code P0C85 on a GMC?

In some cases, a software update for the battery management system may resolve the issue, but physical repairs are often required for sensor or wiring-related problems.