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Engine-Codes – Generic – U0101:87

U0101:87 Code - Lost Communication With Transmission Control Module Missing Message

Quick Answer

The U0101 code indicates that the vehicle has lost communication with the Transmission Control Module (TCM). Common causes include Faulty wiring or connectors leading to TCM, TCM software malfunction, TCM hardware failure. 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
U0101:87 indicates Lost Communication With Transmission Control Module Missing Message.
Common causes
Common causes include Faulty wiring or connectors leading to TCM, TCM software malfunction, TCM hardware failure.
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 U0101:87 Description

The U0101 code indicates that the vehicle has lost communication with the Transmission Control Module (TCM). The TCM is responsible for controlling the transmission system, including shifting gears and managing the clutch. When communication is lost with the TCM, it can lead to issues with the transmission's performance, potentially causing it to shift erratically or not at all. This can result in poor vehicle performance, reduced fuel efficiency, and potential safety hazards.

OBDII Code U0101:87 - Lost Communication With Transmission Control Module Missing Message
U0101:87 Code - Lost Communication With Transmission Control Module Missing Message

Common Causes of U0101:87

  1. Faulty wiring or connectors leading to TCM
  2. TCM software malfunction
  3. TCM hardware failure
  4. Corrosion or water damage to TCM
  5. Electrical interference or short circuits

Symptoms of U0101:87

  1. Erratic shifting or failure to shift gears
  2. Transmission slipping
  3. Harsh or delayed shifting
  4. Check Engine Light illuminated
  5. Vehicle going into "limp mode" where it operates at reduced power

How to Fix U0101:87

  1. Inspect and repair any damaged wiring or connectors related to the TCM.
  2. Check and update TCM software, if applicable.
  3. Replace the TCM if it is determined to be faulty.
  4. Ensure proper grounding and connections for the TCM.
  5. Perform a thorough diagnostic to ensure all related components are functioning correctly.

Cost to Fix U0101:87

The cost of repairing a U0101 code can vary depending on the specific cause and the vehicle's make and model. On average, the repair cost for this issue can range from $200 to $800, including parts and labor. However, it is important to note that the exact cost can be higher or lower based on individual circumstances. It is recommended to consult with a trusted mechanic or dealership to get an accurate estimate for your vehicle.

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Code U0101:87 Information for Specific Makes

  • U0101:87 Lexus — Lost Communication With Transmission Control Module Missing Message
  • U0101:87 Toyota — Lost Communication With Transmission Control Module Missing Message
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 U0101:87 Code

1. What are the common symptoms of OBDII code U0101:87 - Lost Communication With Transmission Control Module Missing Message?

- Common symptoms include the transmission shifting erratically, the vehicle going into limp mode, and the dashboard displaying warning lights related to the transmission system.

2. What are the possible causes of OBDII code U0101:87?

- The code U0101:87 can be triggered by issues such as a faulty transmission control module, damaged wiring connections, a malfunctioning CAN bus system, or a software glitch in the vehicle's computer system.

3. How can I diagnose the cause of OBDII code U0101:87?

- Diagnosing the cause of U0101:87 may involve using a diagnostic scanner to retrieve the code, checking the transmission control module for any physical damage, inspecting the wiring for loose connections or fraying, and testing the CAN bus system for proper functionality.

4. What are some repair tips for resolving OBDII code U0101:87?

- Repair tips may include repairing or replacing damaged wiring connections, resetting the transmission control module, updating the vehicle's software, or replacing the transmission control module if it is faulty.

5. Can I continue driving my vehicle with OBDII code U0101:87 present?

- It is not recommended to drive your vehicle with U0101:87 as it can lead to further transmission issues and potential safety hazards. It's best to address the problem promptly to avoid any long-term damage.

6. How much does it typically cost to repair OBDII code U0101:87?

- The cost of repairing U0101:87 can vary depending on the root cause of the issue. Simple fixes like repairing wiring connections may be relatively inexpensive, while replacing a faulty transmission control module can be more costly.

7. Will resetting the trouble code make OBDII code U0101:87 go away permanently?

- Resetting the trouble code may temporarily clear the warning lights, but if the underlying issue causing U0101:87 is not addressed, the code is likely to reappear once the system detects the problem again.

8. Are there any recalls or technical service bulletins related to OBDII code U0101:87?

- It's recommended to check with your vehicle manufacturer or authorized dealership for any recalls or technical service bulletins related to U0101:87, as they may provide valuable information or potential solutions for the issue.

9. Can a DIY enthusiast fix OBDII code U0101:87 on their own?

- Depending on the specific cause, a DIY enthusiast with the necessary tools and knowledge may be able to diagnose and repair U0101:87. However, complex issues like internal transmission control module failures may require professional expertise.

10. How long does it typically take to repair OBDII code U0101:87?

- The repair time for U0101:87 can vary based on the complexity of the issue and the availability of parts. Simple fixes may take a few hours, while more involved repairs could require a day or more, especially if parts need to be ordered.

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