AutoCodes – Subaru – C0044 Subaru

C0044 Subaru Code - TCM Communication Circuit

Quick Answer

The Control Area Network (CAN) communication failure of Transmission Control Module (TCM) Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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: C0044 Subaru indicates TCM Communication Circuit.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 5,885

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 May 02, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C0044 Subaru Description

The Control Area Network (CAN) communication failure of Transmission Control Module (TCM)

OBDII Code C0044 Subaru - TCM Communication Circuit - AutoCodes.com — C0044 Subaru Code - TCM Communication Circuit

What does this mean?

What are the Possible Causes of the DTC C0044 Subaru?

Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM) harness is open or shorted
Transmission Control Module (TCM) circuit poor electrical connection

How to Fix the DTC C0044 Subaru?

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 C0044 Subaru 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 C0044 Subaru code?

Need more information on how to fix the C0044 Subaru code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0044 Subaru code diagnosed by a professional: Find a repair shop in your area

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 C0044 Subaru Code

1. What are the common symptoms of OBDII code C0044 in a Subaru related to the TCM communication circuit?

The common symptoms include issues with shifting gears, transmission slipping, delayed engagement, and the transmission going into limp mode.

2. What are the possible causes of OBDII code C0044 in a Subaru?

Potential causes can include faulty wiring or connectors in the TCM communication circuit, a malfunctioning TCM module, or issues with the CAN bus communication network.

3. How can I diagnose the TCM communication circuit issue causing OBDII code C0044 in my Subaru?

Diagnosis typically involves checking the wiring and connectors for any damage or corrosion, testing the TCM module, and using a scan tool to analyze the communication signals within the TCM circuit.

4. Can a DIY enthusiast repair the TCM communication circuit problem associated with OBDII code C0044 in a Subaru?

While some basic checks like inspecting connections and wiring can be done by a DIY enthusiast, repairing the TCM module or more complex electrical issues may require professional expertise.

5. Is it safe to continue driving my Subaru with OBDII code C0044 related to the TCM communication circuit issue?

It is not recommended to drive the vehicle with this code present, as it can lead to further transmission problems and potential safety hazards. It is best to address the issue promptly.

6. How much does it typically cost to repair the TCM communication circuit problem causing OBDII code C0044 in a Subaru?

The cost of repair can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Can resetting the OBDII code C0044 in my Subaru make the problem go away temporarily?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue with the TCM communication circuit. The problem is likely to resurface until properly addressed.

8. Are there any preventative maintenance tips to avoid encountering OBDII code C0044 in a Subaru?

Regular inspection of wiring connections, keeping the transmission fluid at the recommended level, and addressing any transmission-related issues promptly can help prevent TCM communication circuit problems.

9. How long does it typically take to repair the TCM communication circuit issue causing OBDII code C0044 in a Subaru?

The repair time can vary based on the complexity of the problem and the availability of parts. It may take a few hours to a full day for the repair to be completed.

10. Will fixing OBDII code C0044 related to the TCM communication circuit improve the overall performance of my Subaru's transmission?

Correcting the TCM communication circuit issue can restore proper communication between the transmission control module and other components, leading to improved transmission performance and smoother operation of the vehicle.