AutoCodes – GMC – C0306 2017 GMC Sierra

C0306 2017 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 2017 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 232

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 2017 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 2017 GMC Sierra - Range Actuator Control Circuit - AutoCodes.com — C0306 2017 GMC Sierra Code - Range Actuator Control Circuit

What does this mean?

What are the Possible Causes of the DTC C0306 2017 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 2017 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 2017 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 2017 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 2017 GMC Sierra Code

1. What does the OBDII code C0306 mean on a 2017 GMC Sierra?

C0306 indicates a problem with the Range Actuator Control Circuit, which is part of the transfer case system responsible for controlling drive modes like 4WD or AWD.

2. What are the symptoms of the C0306 code on a GMC Sierra?

Common symptoms include the â€œService 4WDâ€ message on the dashboard, inability to switch between drive modes, or unusual noises from the transfer case.

3. What causes the C0306 code to appear?

The code is typically triggered by a faulty range actuator motor, damaged wiring or connectors in the control circuit, or a malfunctioning transfer case control module (TCCM).

4. How can I diagnose the C0306 code on my 2017 GMC Sierra?

Start by inspecting the wiring and connectors related to the range actuator motor for damage or corrosion. Use a scan tool to monitor the actuatorâ€™s operation and test the circuit for proper voltage.

5. Can I drive my 2017 GMC Sierra with the C0306 code?

Driving with this code is possible but not recommended, as it may limit drivability in certain conditions and could cause further damage to the transfer case system.

6. How is the C0306 code fixed?

Repairs may involve replacing the faulty range actuator motor, repairing or replacing damaged wiring or connectors, or reprogramming the transfer case control module if necessary.

7. How much does it cost to repair the C0306 code on a GMC Sierra?

Repair costs vary but can range from $200 to $800 depending on whether the issue is with the actuator motor, wiring, or control module.

8. Can a software issue cause the C0306 code?

Yes, outdated or corrupted software in the transfer case control module can occasionally cause this code and may require reprogramming or updating.

9. What tools are needed to troubleshoot the C0306 code?

Youâ€™ll need an OBDII scan tool, a multimeter to test the circuit, and potentially a service manual for wiring diagrams specific to the 2017 GMC Sierra.

10. Will clearing the code fix the C0306 issue?

Clearing the code may temporarily remove it, but unless the underlying problem is resolved, the code will likely return.