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Engine-Codes – Generic – C1135

C1135 Code - CAN Communication Line Or TCM

Quick Answer

The C1135 code indicates a problem with the Controller Area Network (CAN) communication line or the Transmission Control Module (TCM). Common causes include Faulty TCM, Wiring or connection issues in the CAN communication line, Faulty transmission sensors. 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
C1135 indicates CAN Communication Line Or TCM.
Common causes
Common causes include Faulty TCM, Wiring or connection issues in the CAN communication line, Faulty transmission sensors.
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 06, 2024
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Code C1135 Description

The C1135 code indicates a problem with the Controller Area Network (CAN) communication line or the Transmission Control Module (TCM). The CAN communication line is responsible for transmitting data between various modules in the vehicle, while the TCM controls the transmission operation. When this code appears, it typically means there is a communication issue between the TCM and other modules, potentially leading to transmission problems. This can affect the vehicle's performance, causing issues such as shifting delays, harsh shifting, or even the transmission going into limp mode. If left unaddressed, it could result in further transmission damage or complete transmission failure.

OBDII Code C1135 - CAN Communication Line Or TCM
C1135 Code - CAN Communication Line Or TCM

Common Causes of C1135

  1. Faulty TCM
  2. Wiring or connection issues in the CAN communication line
  3. Faulty transmission sensors
  4. Software glitches or updates needed
  5. Electrical interference or shorts

Symptoms of C1135

  1. Delayed or harsh shifting
  2. Transmission slipping
  3. Limp mode activation
  4. Check engine light illuminated
  5. Loss of power or acceleration

How to Fix C1135

  1. Diagnose the specific cause of the communication issue using a diagnostic scanner.
  2. Check the wiring and connections in the CAN communication line for any damage or corrosion.
  3. Test the TCM for proper functionality and replace if necessary.
  4. Inspect and replace any faulty transmission sensors.
  5. Reset the codes and perform a test drive to ensure the issue is resolved.

Cost to Fix C1135

The cost of repairing a CAN communication line issue or TCM problem can vary depending on the exact cause of the fault. On average, you can expect to pay anywhere from $200 to $800 for parts and labor. Keep in mind that diagnosis time and labor rates can vary, so it's best to consult with a local auto repair shop for a more accurate estimate.

What does this mean?

Tech Notes for C1135

Control Area Network (CAN) Communication Line or Transmission Control Module (TCM). The code means that the ABS Control Module has lost or at some point lost communications with the TCM.

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Code C1135 Information for Specific Makes

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 C1135 Code

What does OBDII code C1135 mean?

OBDII code C1135 indicates a problem with the CAN communication line or the Transmission Control Module (TCM), often signaling communication issues between the TCM and other control modules.

What are common symptoms of the C1135 code?

Common symptoms include transmission performance issues, such as erratic shifting, the check engine light illuminating, and potentially other warning lights related to the transmission.

What can cause the C1135 code to trigger?

Causes can include a faulty TCM, damaged wiring or connectors in the CAN communication line, or issues with other control modules that affect communication.

How can I diagnose the C1135 code?

Begin by scanning the vehicle with an OBDII scanner to confirm the code. Then, inspect the wiring and connectors for damage, check the TCM for proper function, and ensure all control modules are communicating properly.

What repairs are typically needed for a C1135 code?

Repairs may involve fixing or replacing damaged wiring or connectors, reprogramming or replacing the TCM, or addressing issues in other related control modules.

Can I drive my vehicle with the C1135 code?

While it may be possible to drive the vehicle, it's not recommended as it could lead to further transmission issues and potentially unsafe driving conditions.

How do I clear the C1135 code after repairs?

You can clear the code using an OBDII scanner. After repairs, erase the code and take the vehicle for a test drive to see if it returns.

Is the C1135 code specific to certain vehicle makes or models?

While the C1135 code is standardized, specific symptoms and causes may vary by make and model, so it’s important to consult the vehicle’s service manual for detailed information.

What should I do if the C1135 code keeps returning?

If the code persists after repairs, further diagnostic testing may be necessary to identify underlying issues, such as additional faults in the CAN communication line or a defective control module.

Discuss the causes and fixes for C1135 OBDII Code

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