AutoCodes – RAM – C149D RAM

C149D RAM Code - Clutch Calibration Not Learned

Quick Answer

The Drivetrain Control Module (DTCM) has detected that the transfer case clutch calibration is missing, invalid, or has not been learned. Common causes include Transfer case clutch relearn procedure. 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: C149D RAM indicates Clutch Calibration Not Learned.
Common causes: Common causes include Transfer case clutch relearn procedure.
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 26

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 Jun 01, 2026

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code C149D RAM Description

The Drivetrain Control Module (DTCM) has detected that the transfer case clutch calibration is missing, invalid, or has not been learned. This may occur after module programming, transfer case service, battery-related memory loss, or drivetrain control module replacement. The fault can cause a Service 4WD warning message and may require a transfer case clutch relearn procedure using a compatible diagnostic scan tool.

OBDII Code C149D RAM - Clutch Calibration Not Learned - AutoCodes.com — C149D RAM Code - Clutch Calibration Not Learned

What does this mean?

What are the Possible Causes of the DTC C149D RAM?

Transfer case clutch relearn procedure

How to Fix the DTC C149D RAM?

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

- C149D:54 - Clutch Calibration Not Learned – Missing Calibrations
- C149D:55 - Clutch Calibration Not Learned – Not Configured

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C149D RAM 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.