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Engine-Codes – Generic – U1102

U1102 Code - Invalid Or Missing Data For Primary Id

Quick Answer

The U1102 diagnostic trouble code (DTC) indicates that there is invalid or missing data for the primary ID in the vehicle's communication network. Common causes include Faulty wiring or connections in the CAN bus system, Corrosion or damage to connectors or terminals, Failed module or sensor causing data communication issues. 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
U1102 indicates Invalid Or Missing Data For Primary Id.
Common causes
Common causes include Faulty wiring or connections in the CAN bus system, Corrosion or damage to connectors or terminals, Failed module or sensor causing data communication issues.
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 Aug 30, 2024
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Code U1102 Description

The U1102 diagnostic trouble code (DTC) indicates that there is invalid or missing data for the primary ID in the vehicle's communication network. This code is commonly associated with issues in the Controller Area Network (CAN) bus system, which is responsible for communication between various modules and sensors in the vehicle. When this data is missing or incorrect, it can lead to communication errors between different components, affecting the overall performance of the vehicle.

OBDII Code U1102 - Invalid Or Missing Data For Primary Id
U1102 Code - Invalid Or Missing Data For Primary Id

Common Causes of U1102

  1. Faulty wiring or connections in the CAN bus system
  2. Corrosion or damage to connectors or terminals
  3. Failed module or sensor causing data communication issues
  4. Software glitches or bugs in the vehicle's electronic control modules
  5. Electrical interference from aftermarket accessories or modifications

Symptoms of U1102

  1. Check engine light illuminated on the dashboard
  2. Loss of communication with certain modules or sensors
  3. Erratic behavior of certain vehicle systems
  4. Difficulty starting the vehicle
  5. Reduced fuel efficiency

How to Fix U1102

  1. Begin by inspecting the wiring, connectors, and terminals in the CAN bus system for any signs of damage, corrosion, or loose connections.
  2. Use a diagnostic scanner to check for specific modules or sensors that may be causing the communication error and address any faults found.
  3. Update the software in the vehicle's electronic control modules to the latest version provided by the manufacturer to fix any software-related issues.
  4. Clear the DTC from the vehicle's computer system and perform a test drive to confirm that the issue has been resolved.
  5. If the problem persists, consult a professional mechanic or dealership for further diagnosis and repair.

Cost to Fix U1102

The typical repair costs for resolving a U1102 DTC can range from $100 to $500, depending on the specific cause of the issue and the necessary repairs. This estimate includes parts and labor, but actual costs may vary based on the location, vehicle make and model, and the required diagnostic time. It's recommended to consult with a trusted auto repair shop for a more accurate estimate based on your vehicle's needs.

What does this mean?

Tech Notes for U1102

This is typically an electrical wiring connection issue at one of the controllers being monitored by the manufacturer.
It can occur if:
Someone changes a battery while the ignition switch is left on, that is, left in the RUN position.
Someone flashes/upgrades their engine controller – other modules unable to communicate with PCM during this process – this will set U1102 at a multitude of controllers on the vehicle – all false codes. Erase and carry on.
May need to disconnect both battery cables and touch them together for 15 seconds. Reattach battery cables, positive first, then negative and see if a soft reset helps.

When is the Code Detected?

When the Powertrain Control Module (PCM) is unable to communicate with any other controller on the bus network at any time while the ignition switch is in the RUN position.

Need more information about the U1102 code?

Need more information on how to fix the U1102 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1102 code diagnosed by a professional: Find a repair shop in your area

Code U1102 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 U1102 Code

1. What are common symptoms of OBDII code U1102?

- Common symptoms include dashboard warning lights illuminated, rough idling, poor acceleration, and potential stalling of the vehicle.

2. What does the OBDII code U1102 "Invalid Or Missing Data For Primary Id" indicate?

- This code indicates that the vehicle's primary identification information is either missing or invalid in the communication network.

3. What are possible causes of code U1102?

- Potential causes include faulty wiring connections, issues with the vehicle's network communication system, or a malfunction in the electronic control module.

4. How can I diagnose OBDII code U1102?

- Diagnosing the code typically involves using a professional OBDII scanner to retrieve the specific error codes and checking the vehicle's network connections for any faults.

5. Can I still drive my vehicle with code U1102 present?

- It is not recommended to drive the vehicle with this code present, as it can lead to potential performance issues and further damage to the vehicle if left unaddressed.

6. How can I repair OBDII code U1102?

- Repairing this code may involve checking and repairing any damaged wiring connections, resetting the electronic control module, or seeking professional help to diagnose and fix the underlying issue.

7. Is it necessary to reset the code after repairing U1102?

- Yes, it is recommended to reset the code after repairing U1102 to clear the error from the system and ensure proper functioning of the vehicle.

8. Can a DIY enthusiast fix OBDII code U1102 at home?

- While some basic troubleshooting steps can be taken at home, diagnosing and repairing OBDII code U1102 may require professional assistance due to the complexity of the vehicle's network communication system.

9. How much does it cost to fix OBDII code U1102?

- The cost of fixing this code can vary depending on the underlying issue, the need for replacement parts, and labor costs. It is advisable to get a diagnosis from a professional to determine the exact cost.

10. Are there any preventative measures to avoid OBDII code U1102 in the future?

- Regular maintenance checks, ensuring proper wiring connections, and promptly addressing any warning signs can help prevent issues that may trigger OBDII code U1102.

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