AutoCodes – Generic – C0306

C0306 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 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 14,904

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 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 - Range Actuator Control Circuit - AutoCodes.com — C0306 Code - Range Actuator Control Circuit

What does this mean?

What are the Possible Causes of the DTC C0306?

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?

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 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 code?

Need more information on how to fix the C0306 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0306 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0306 Buick — Range Actuator Control Circuit
C0306 Cadillac — Range Actuator Control Circuit
C0306 Chevrolet — Range Actuator Control Circuit
C0306 GMC — Range Actuator Control Circuit
C0306 Hummer — Range Actuator Control Circuit

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 Code

1. What are the common symptoms of OBDII code C0306 (Range Actuator Control Circuit)?

The common symptoms of OBDII code C0306 include erratic shifting behavior, difficulty changing gears, and in some cases, the vehicle may go into limp mode.

2. What are some possible causes of OBDII code C0306 (Range Actuator Control Circuit)?

Possible causes of OBDII code C0306 include a faulty range actuator control circuit, damaged wiring or connectors, a malfunctioning range actuator motor, or a problem with the transmission control module.

3. How can I diagnose OBDII code C0306 (Range Actuator Control Circuit)?

Diagnosing OBDII code C0306 typically involves using a scan tool to read the code, checking the transmission range sensor data, inspecting the wiring and connectors for damage, and testing the range actuator control circuit and motor for proper operation.

4. Can I still drive my vehicle with OBDII code C0306 (Range Actuator Control Circuit)?

It is not recommended to drive your vehicle with OBDII code C0306 present, as it can lead to further damage to the transmission system. It's best to address the issue promptly to avoid potential safety hazards.

5. How can I repair OBDII code C0306 (Range Actuator Control Circuit)?

Repairing OBDII code C0306 may involve replacing a faulty range actuator control circuit, repairing damaged wiring or connectors, replacing a malfunctioning range actuator motor, or addressing any issues with the transmission control module.

6. Is it possible to reset OBDII code C0306 (Range Actuator Control Circuit) without fixing the underlying issue?

While you can clear the error code using a scan tool, it is not recommended to reset OBDII code C0306 without addressing the root cause, as the issue will likely reoccur and potentially cause further damage.

7. Are there any DIY tips for troubleshooting OBDII code C0306 (Range Actuator Control Circuit)?

DIY tips for troubleshooting OBDII code C0306 include checking for loose or damaged wiring, ensuring proper connections, and inspecting the range actuator control circuit and motor for any visible issues before seeking professional help.

8. How much does it typically cost to repair OBDII code C0306 (Range Actuator Control Circuit)?

The cost of repairing OBDII code C0306 can vary depending on the specific cause of the issue, the extent of the damage, and labor costs. It's advisable to consult with a professional mechanic for an accurate estimate.

9. Can OBDII code C0306 (Range Actuator Control Circuit) cause other problems if left untreated?

If left untreated, OBDII code C0306 can potentially lead to further transmission issues, poor vehicle performance, and safety concerns. It's important to address the problem promptly to prevent additional complications.

10. How long does it typically take to repair OBDII code C0306 (Range Actuator Control Circuit)?

The time needed to repair OBDII code C0306 can vary based on the complexity of the issue, availability of parts, and the mechanic's expertise. In general, it may take a few hours to a full day to complete the repair process.