AutoCodes – Cadillac – C0397 Cadillac

C0397 Cadillac Code - Transfer Case Clutch

Quick Answer

In 4WD/AWD Automatic range, the Transfer Case Control Module monitors the front and rear wheel speed sensors for slip. 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: C0397 Cadillac indicates Transfer Case Clutch.
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 1,392

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jul 11, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0397 Cadillac Description

In 4WD/AWD Automatic range, the Transfer Case Control Module monitors the front and rear wheel speed sensors for slip. If the Transfer Case Control Module detects slip and is unable to correct for a difference between the front and rear speed sensors, it will command the transfer case to apply the clutch. In addition, the Transfer Case Control Module tests for clutch pack wear by performing a high side kiss point check at power down and comparing it to the transfer case range actuator position sensor reading.

OBDII Code C0397 Cadillac - Transfer Case Clutch - AutoCodes.com — C0397 Cadillac Code - Transfer Case Clutch

What does this mean?

What are the Possible Causes of the DTC C0397 Cadillac?

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 C0397 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

C0397:54 Transfer Case Clutch High Temperature
C0397:58 Transfer Case Clutch Performance
C0397:4B (if equipped) Transfer Case Clutch Calibration Not Learned
C0397:F3 Transfer Case Clutch Worn Out Clutch
C0397:F4 Transfer Case Range Position Sensor Over Travel

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0397 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 C0397 Cadillac Code

1. What does OBDII code C0397 mean on a Cadillac?

C0397 indicates an issue with the transfer case clutch system, which is responsible for distributing power between the front and rear wheels in an all-wheel or four-wheel-drive system.

2. What are common symptoms of a C0397 code in a Cadillac?

Symptoms may include difficulty engaging all-wheel or four-wheel drive, unusual noises from the transfer case, or the all-wheel-drive warning light appearing on the dashboard.

3. What causes the C0397 code to appear?

Common causes include a faulty transfer case clutch, wiring issues, a malfunctioning transfer case control module, or low transfer case fluid.

4. Can driving with the C0397 code damage my Cadillac?

Driving with this code might lead to further damage to the transfer case system or reduced traction in slippery conditions, so itâ€™s best to address it promptly.

5. How do I diagnose the C0397 code on my Cadillac?

Diagnosis typically involves scanning for additional codes, inspecting the transfer case clutch and wiring for damage, checking fluid levels, and testing the control module.

6. Is the C0397 code related to transfer case fluid levels?

Yes, low or contaminated transfer case fluid can cause the C0397 code since proper lubrication is vital for the clutch's operation.

7. How do I fix the C0397 code on a Cadillac?

Repairs may include replacing the transfer case clutch, repairing or replacing damaged wiring, updating or reprogramming the control module, or replenishing and flushing the transfer case fluid.

8. What tools are needed to troubleshoot the C0397 code?

Youâ€™ll need an OBDII scanner, basic hand tools, a multimeter for electrical tests, and possibly a service manual for your specific Cadillac model.

9. Can a C0397 code be cleared without repairs?

Clearing the code without addressing the root cause may temporarily remove it, but it will likely return until the underlying issue is resolved.

10. How much does it cost to repair a C0397 code on a Cadillac?

Repair costs vary widely based on the specific issue but can range from $150 for a fluid service to over $1,000 for transfer case component replacements.