AutoCodes – Generic – C038D

C038D Code - Range Actuator Position Not Learned

Quick Answer

This is an internal programming fault detection of the transfer case control module. Common causes include Perform Range Actuator Learn 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: C038D indicates Range Actuator Position Not Learned.
Common causes: Common causes include Perform Range Actuator Learn 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 7,365

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 Jul 11, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C038D Description

This is an internal programming fault detection of the transfer case control module. No external circuits are involved.
This Diagnostic Trouble Code (DTC) is set anytime a transfer case control module is replaced or reprogrammed. The Range Actuator Learn procedure must be performed in order for the transfer case control module to learn current clutch tolerance based on clutch stack up and accumulated clutch wear.

OBDII Code C038D - Range Actuator Position Not Learned - AutoCodes.com — C038D Code - Range Actuator Position Not Learned

What does this mean?

What are the Possible Causes of the DTC C038D?

Perform Range Actuator Learn Procedure

How to Fix the DTC C038D?

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 C038D 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.

Need more information about the C038D code?

Need more information on how to fix the C038D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C038D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C038D Buick — Range Actuator Position Not Learned
C038D Cadillac — Range Actuator Position Not Learned
C038D Chevrolet — Range Actuator Position Not Learned
C038D GMC — Range Actuator Position Not Learned

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 C038D Code

1. What are common symptoms of OBDII code C038D (Range Actuator Position Not Learned)?

- Common symptoms include erratic shifting, transmission slippage, and difficulty engaging gears.

2. What causes the OBDII code C038D to trigger?

- The code is typically triggered when the transmission range actuator position has not been properly learned by the vehicle's computer.

3. How can I diagnose the issue related to OBDII code C038D?

- A professional diagnostic tool can be used to access the transmission control module (TCM) to determine if the range actuator position has been learned correctly.

4. Can I reset the OBDII code C038D myself?

- It is recommended to have a professional mechanic reset the code after ensuring that the range actuator position has been properly learned.

5. What are the repair options for OBDII code C038D?

- Repair options may include relearning the range actuator position using a diagnostic tool, checking for any loose connections, or replacing the range actuator if necessary.

6. Is it safe to continue driving with OBDII code C038D present?

- It is not recommended to continue driving with this code present, as it can lead to further transmission issues and potential safety hazards.

7. How can I prevent OBDII code C038D from recurring?

- Regular maintenance and ensuring proper transmission system function can help prevent the recurrence of this code.

8. Can a DIY enthusiast attempt to fix OBDII code C038D?

- While some basic checks like inspecting connections can be done by a DIY enthusiast, diagnosing and repairing the root cause of the code is best left to a professional mechanic.

9. Does OBDII code C038D affect vehicle performance?

- Yes, this code can significantly impact the performance of the transmission system, leading to issues with shifting and overall drivability.

10. How long does it typically take to repair OBDII code C038D?

- The repair time can vary depending on the underlying cause, but it may take a few hours to relearn the range actuator position or longer if component replacement is necessary.