AutoCodes – Cadillac – C0310 Cadillac

C0310 Cadillac Code - Motor A/B Circuit Open

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: C0310 Cadillac indicates Motor A/B Circuit Open.
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 862

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 C0310 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.

OBDII Code C0310 Cadillac - Motor A/B Circuit Open - AutoCodes.com — C0310 Cadillac Code - Motor A/B Circuit Open

What does this mean?

What are the Possible Causes of the DTC C0310 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 C0310 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 C0310 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 C0310 Cadillac Code

1. What does OBDII code C0310 mean on a Cadillac?

Code C0310 indicates an open circuit in the Motor A or B circuit, which is linked to the transfer case motor or actuator in the vehicle's drivetrain system.

2. What are the common symptoms of code C0310 on a Cadillac?

Symptoms may include the Service 4WD light illuminating, failure to shift between 4WD and 2WD modes, odd noises from the transfer case, or reduced drivetrain functionality.

3. What causes the C0310 code to appear on a Cadillac?

The code can be triggered by damaged wiring, a faulty transfer case motor/actuator, corroded electrical connections, or a malfunctioning control module.

4. Can I drive my Cadillac with a C0310 code?

While the vehicle may still be drivable, you may lose 4WD functionality, which could affect handling in certain conditions. Itâ€™s best to address the issue promptly.

5. How do I diagnose the C0310 code on a Cadillac?

Start by inspecting the wiring and connectors for damage or corrosion. Use a multimeter to check for continuity in the Motor A/B circuit and scan for additional codes to identify related issues.

6. How is the C0310 code fixed on a Cadillac?

Repairs may involve replacing damaged wiring, cleaning corroded connectors, or replacing the transfer case motor/actuator if itâ€™s found to be faulty.

7. How much does it cost to fix a C0310 code on a Cadillac?

Repair costs vary depending on the issue. Wiring repairs might cost $100-$300, while replacing the transfer case motor can cost $500-$800, including parts and labor.

8. Can a faulty transfer case control module cause the C0310 code?

Yes, a malfunctioning transfer case control module can trigger the C0310 code, as it may fail to properly communicate with the motor circuits.

9. Will resetting the code clear the C0310 issue on a Cadillac?

Clearing the code without addressing the root cause will only temporarily remove the error. The problem will likely return until repairs are made.

10. What tools are needed to troubleshoot the C0310 code?

Common tools include an OBDII scanner, a multimeter for checking circuit continuity, and basic hand tools for inspecting and repairing wiring or components.