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C0044 Subaru Code - TCM Communication Circuit

Quick Answer

The C0044 diagnostic trouble code (DTC) for Subaru vehicles refers to a problem with the Transmission Control Module (TCM) communication circuit. Common causes include Faulty TCM module, Loose or corroded wiring connections, Defective transmission control relay. 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 TCM module, Loose or corroded wiring connections, Defective transmission control relay.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code C0044 Subaru Description

The C0044 diagnostic trouble code (DTC) for Subaru vehicles refers to a problem with the Transmission Control Module (TCM) communication circuit. The TCM is a crucial component of the vehicle's transmission system, responsible for controlling the shifting of gears and ensuring smooth operation. When there is an issue with the communication circuit, it can lead to a range of performance problems and potentially even cause the vehicle to become undrivable.

OBDII Code C0044 Subaru - TCM Communication Circuit
C0044 Subaru Code - TCM Communication Circuit

Common Causes of C0044 Subaru

  1. Faulty TCM module
  2. Loose or corroded wiring connections
  3. Defective transmission control relay
  4. Water damage to TCM or wiring
  5. Malfunctioning CAN bus communication system

Symptoms of C0044 Subaru

  1. Erratic shifting of gears
  2. Delayed or harsh gear shifts
  3. Transmission slipping
  4. Illuminated Check Engine Light
  5. Vehicle going into limp mode

How to Fix C0044 Subaru

  1. Begin by conducting a thorough inspection of the TCM and related wiring connections to identify any visible damage or corrosion.
  2. Test the transmission control relay and replace it if found to be faulty.
  3. Check for any water damage to the TCM or wiring and address any issues found.
  4. Use a diagnostic scanner to reset the DTC and re-establish communication between the TCM and other modules.
  5. If the issue persists, consider replacing the TCM module with a new or remanufactured unit.

Cost to Fix C0044 Subaru

The cost of repairing a TCM communication circuit issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the cost of parts for this repair can range from $200 to $500, with labor costs adding another $100 to $300. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to get a detailed estimate from a trusted mechanic before proceeding with the repair.

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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 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.

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