AutoCodes – Cadillac – C0307 Cadillac

C0307 Cadillac 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 Cadillac 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 740

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

What does this mean?

What are the Possible Causes of the DTC C0307 Cadillac?

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 Cadillac?

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 Cadillac 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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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 Cadillac Code

1. What are the common symptoms of OBDII code C0307 in a Cadillac?

- Common symptoms include rough engine idle, decreased engine performance, and potential stalling of the vehicle.

2. What are the possible causes of the OBDII code C0307 in a Cadillac?

- Possible causes include a faulty motor A/B circuit, damaged wiring or connectors, issues with the motor itself, or a problem with the control module.

3. How can I diagnose the OBDII code C0307 in my Cadillac?

- Diagnosis typically involves using a scan tool to retrieve the trouble code, followed by inspecting the motor A/B circuit, wiring, connectors, and related components for any signs of damage or malfunction.

4. Can I still drive my Cadillac with the OBDII code C0307 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage and potential safety issues. It's best to address the issue promptly.

5. What are some repair tips for fixing the OBDII code C0307 in a Cadillac?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the motor if necessary, and resetting the trouble code after completing the repairs.

6. Is it necessary to take my Cadillac to a professional mechanic for OBDII code C0307 repair?

- While some DIY enthusiasts may be able to address the issue themselves, it is generally recommended to consult a professional mechanic for an accurate diagnosis and proper repair of this code.

7. How much does it typically cost to repair the OBDII code C0307 in a Cadillac?

- The cost of repairs can vary depending on the specific cause of the code and the labor rates in your area. It's best to get a few quotes from different mechanics to compare prices.

8. Will resetting the trouble code make the OBDII code C0307 go away permanently?

- Simply resetting the trouble code may temporarily clear the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear.

9. Can extreme weather conditions affect the occurrence of the OBDII code C0307 in a Cadillac?

- Yes, extreme heat or cold can sometimes exacerbate electrical issues like those related to the motor A/B circuit, potentially leading to the triggering of this code.

10. How urgently should I address the OBDII code C0307 in my Cadillac?

- It is advisable to address the code as soon as possible to prevent any further damage to the engine or related components and ensure the vehicle operates safely and efficiently.