AutoCodes – Chevrolet – C0307 Chevrolet

C0307 Chevrolet Code - Motor A/B Circuit Range/Performance

Quick Answer

The transfer case motor is a bi-directional, permanent magnet, D.C. Common causes include Faulty Transfer Case Motor, 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: C0307 Chevrolet indicates Motor A/B Circuit Range/Performance.
Common causes: Common causes include Faulty Transfer Case Motor, 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 1,778

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 Jun 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0307 Chevrolet Description

The transfer case motor is a bi-directional, permanent magnet, D.C. motor. When energized, (through Motor Control A or Motor Control B, the ground is provided by the opposing Motor Control circuit and then grounded through the transfer case shift control module ground circuit), the motor, through a series of gears, rotates a shaft which moves the mode and range forks to shift the transfer case between 4H, AUTO 4WD, 2H, N, and 4L ranges. While the transfer case motor is energized the transfer case shift control module also energizes the solenoid for the transfer case lock. The motor lock is disabled (locking action released) and free turning of the transfer case motor and sector shaft is then allowed.
This DTC detects a short to ground in Motor Control A or Motor Control B CKT.

OBDII Code C0307 Chevrolet - Motor A/B Circuit Range/Performance - AutoCodes.com — C0307 Chevrolet Code - Motor A/B Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC C0307 Chevrolet?

Faulty Transfer Case Motor
Transfer Case Motor harness is open or shorted
Transfer Case Motor circuit poor electrical connection

How to Fix the DTC C0307 Chevrolet?

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 C0307 Chevrolet 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.

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Need Help with the 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 C0307 Chevrolet Code

1. What does the OBDII code C0307 mean for a Chevrolet?

The C0307 code indicates an issue with the Motor A/B Circuit, specifically related to its range or performance, often linked to the transfer case encoder motor.

2. What are the common symptoms of the C0307 code in a Chevrolet?

Symptoms may include the Service 4WD light illuminating, failure to shift into or out of 4WD mode, and unusual noises from the transfer case.

3. What causes the C0307 code to appear in a Chevrolet?

Common causes include a faulty transfer case encoder motor, damaged wiring or connectors in the motor circuit, or issues with the transfer case control module.

4. Can I drive my Chevrolet with the C0307 code active?

Driving is possible but not recommended, as the 4WD system may not function properly, which could affect vehicle performance and safety, especially in off-road or poor weather conditions.

5. How is the C0307 code diagnosed on a Chevrolet?

A technician will typically use a scan tool to confirm the code, inspect the transfer case encoder motor and wiring, and test the circuit for proper voltage and continuity.

6. What repairs are commonly needed to fix the C0307 code in a Chevrolet?

Repairs may include replacing the transfer case encoder motor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the transfer case control module.

7. How much does it cost to fix the C0307 code on a Chevrolet?

Repair costs can range from $200 to $1,000 depending on whether the encoder motor, wiring, or control module needs replacement.

8. Can a bad transfer case encoder motor cause the C0307 code?

Yes, a malfunctioning transfer case encoder motor is one of the most common reasons for the C0307 code.

9. Can clearing the code fix the C0307 issue on a Chevrolet?

Clearing the code may temporarily turn off the warning light, but it wonâ€™t fix the underlying problem causing the code to appear.

10. How can I prevent the C0307 code from returning on my Chevrolet?

Regular maintenance, including inspecting the transfer case system, keeping electrical connections clean and secure, and addressing 4WD issues promptly, can help prevent the code.