AutoCodes – GMC – C0306 2018 GMC Sierra

C0306 2018 GMC Sierra Code - Range Actuator Control Circuit

Quick Answer

The Transfer Case Motor, also known as the transfer case range actuator, is a bi-directional, permanent magnet, DC motor. Common causes include Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator), Transfer Case Motor harness is open or shorted, Transfer Case Motor 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: C0306 2018 GMC Sierra indicates Range Actuator Control Circuit.
Common causes: Common causes include Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator), Transfer Case Motor harness is open or shorted, Transfer Case Motor 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 300

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 Jul 05, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0306 2018 GMC Sierra Description

The Transfer Case Motor, also known as the transfer case range actuator, is a bi-directional, permanent magnet, DC motor. When energized, through the transfer case clockwise circuit or transfer case counterclockwise circuit, the ground is provided by the opposing motor control circuit which becomes grounded through the transfer case control module ground circuit. The transfer case range actuator, through a series of gears, rotates the transfer case control actuator shaft which moves the transfer case two/four-wheel drive actuator cam and transfer case high/low shift fork in order to shift the transfer case between the following modes or ranges: 2WD, 4WD/AWD Automatic, 4WD High/Locked, 4WD Low and Neutral.

OBDII Code C0306 2018 GMC Sierra - Range Actuator Control Circuit - AutoCodes.com — C0306 2018 GMC Sierra Code - Range Actuator Control Circuit

What does this mean?

What are the Possible Causes of the DTC C0306 2018 GMC Sierra?

Faulty Transfer Case Motor (Transfer Case Two/Four Wheel Drive Actuator)
Transfer Case Motor harness is open or shorted
Transfer Case Motor circuit poor electrical connection
Faulty Transfer Case Control Module

How to Fix the DTC C0306 2018 GMC Sierra?

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 C0306 2018 GMC Sierra 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 C0306 2018 GMC Sierra code?

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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.

Frequently Asked Questions about C0306 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code C0306 in a 2018 GMC Sierra?

- Common symptoms include erratic shifting, poor vehicle performance, and potential difficulty in engaging certain gears.

2. What does the Range Actuator Control Circuit refer to in a 2018 GMC Sierra?

- The Range Actuator Control Circuit is a component that helps control the transmission range selection in the vehicle.

3. What are some possible causes of the C0306 code in a 2018 GMC Sierra?

- Potential causes include a faulty range actuator control circuit, damaged wiring or connectors, or issues with the transmission control module.

4. How should I diagnose the C0306 code in my 2018 GMC Sierra?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the wiring and connectors for damage, and testing the range actuator control circuit.

5. Can I continue driving my 2018 GMC Sierra with the C0306 code present?

- It is not recommended to continue driving the vehicle with the C0306 code, as it can lead to further transmission issues and potential safety hazards.

6. How can I repair the Range Actuator Control Circuit in my 2018 GMC Sierra?

- Repair methods may include replacing the faulty range actuator control circuit, repairing damaged wiring or connectors, or reprogramming the transmission control module.

7. Is it necessary to take my 2018 GMC Sierra to a dealership for C0306 code repair?

- While a dealership may have specialized knowledge and tools, an experienced mechanic or automotive technician can also diagnose and repair the issue effectively.

8. Can a DIY enthusiast fix the C0306 code in a 2018 GMC Sierra?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the C0306 code, especially if it involves basic wiring or component replacement.

9. How much does it typically cost to repair the C0306 code in a 2018 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the code and whether parts need to be replaced. It is advisable to obtain quotes from different repair shops.

10. How can I prevent the C0306 code from reoccurring in my 2018 GMC Sierra?

- Regular maintenance, such as checking the transmission system, keeping wiring connections secure, and addressing any warning signs promptly, can help prevent the code from reoccurring.