AutoCodes – Cadillac – C0315 Cadillac

C0315 Cadillac Code - Module Ground Circuit

Quick Answer

The transfer case motor is a bi-directional, permanent magnet, D.C. Common causes include Faulty Transfer Case Shift Control Module, Transfer Case Shift Control Module harness is open or shorted, Transfer Case Shift Control Module 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: C0315 Cadillac indicates Module Ground Circuit.
Common causes: Common causes include Faulty Transfer Case Shift Control Module, Transfer Case Shift Control Module harness is open or shorted, Transfer Case Shift Control Module 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 880

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0315 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 C0315 Cadillac - Module Ground Circuit - AutoCodes.com — C0315 Cadillac Code - Module Ground Circuit

What does this mean?

What are the Possible Causes of the DTC C0315 Cadillac?

Faulty Transfer Case Shift Control Module
Transfer Case Shift Control Module harness is open or shorted
Transfer Case Shift Control Module circuit poor electrical connection

How to Fix the DTC C0315 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 does this mean?

Code Tech Notes

Transfer Case Shift Control Module

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0315 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 C0315 Cadillac Code

1. What does the OBDII code C0315 mean on a Cadillac?

C0315 indicates a problem with the module ground circuit in the vehicleâ€™s transfer case control module, which can affect the functionality of the transfer case.

2. What are the symptoms of code C0315 in a Cadillac?

Symptoms may include the service 4WD light illuminating, issues with shifting into 4WD modes, or loss of transfer case functionality.

3. What causes the C0315 code to appear on a Cadillac?

Common causes include a poor ground connection, corroded or damaged wiring, loose ground screws, or a faulty transfer case control module.

4. How do I diagnose the C0315 code on my Cadillac?

Inspect the ground wiring and connectors for damage or corrosion, check for loose or broken ground screws, and test the transfer case control module for proper operation.

5. Can driving with a C0315 code cause further damage?

While it may not immediately damage the vehicle, ignoring the fault can lead to further electrical issues or loss of four-wheel drive functionality in critical situations.

6. How can I fix the C0315 code on my Cadillac?

Repair or replace damaged ground wires, clean corroded connections, tighten loose ground screws, and replace the transfer case control module if necessary.

7. Is the C0315 code specific to Cadillacs with four-wheel drive?

Yes, this code is typically associated with four-wheel-drive Cadillacs equipped with a transfer case control module.

8. How much does it cost to fix the C0315 code on a Cadillac?

Repair costs can vary depending on the issue but may range from $50 to $300 for wiring repairs or up to $600 for a replacement transfer case control module.

9. Can a weak battery trigger the C0315 code on a Cadillac?

While unlikely, a weak or failing battery can contribute to electrical issues, potentially exacerbating ground circuit problems.

10. Do I need special tools to fix the C0315 code on a Cadillac?

Basic tools like a multimeter for testing circuits and a wrench for tightening ground screws are typically sufficient, but a scan tool may be required to reset the code after repairs.