AutoCodes – Generic – U1087

U1087 Code - Invalid Or Missing Data For Primary Id

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Module that is not communicating, Module harness is open or shorted, Module 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: U1087 indicates Invalid Or Missing Data For Primary Id.
Common causes: Common causes include Faulty Module that is not communicating, Module harness is open or shorted, Module 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.

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Code Popularity 5,261

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1087 Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, the Diagnostic Trouble Code (DTC) is set.

OBDII Code U1087 - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1087 Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1087?

Faulty Module that is not communicating
Module harness is open or shorted
Module circuit poor electrical connection

How to Fix the DTC U1087?

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 U1087 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 U1087 code?

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Need Help with the Code?

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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 U1087 Code

1. What does the OBDII code U1087 mean?

U1087 indicates that the vehicle's control modules are unable to communicate properly due to invalid or missing data for the primary identifier.

2. What are the common symptoms of the U1087 code?

Symptoms may include illuminated warning lights (e.g., Check Engine Light), erratic instrument cluster behavior, poor vehicle performance, or failure of certain electronic systems.

3. What causes the U1087 code to appear?

The code can be triggered by faulty wiring, a malfunctioning control module, a failed data network connection, or interference in the Controller Area Network (CAN) system.

4. Can the U1087 code cause drivability issues?

Yes, depending on the affected system, it may result in reduced performance, improper transmission shifts, or loss of certain vehicle functions.

5. How is the U1087 code diagnosed?

A technician will use a scan tool to check for related codes, inspect the wiring and connectors, and test the communication network between the control modules.

6. Is the U1087 code serious?

While the severity depends on the affected system, unresolved communication errors can lead to further malfunctions and should be addressed promptly.

7. What repairs are typically needed for the U1087 code?

Repairs may include fixing damaged wiring, replacing faulty connectors, reprogramming or replacing a control module, or repairing the CAN bus system.

8. Can a dead battery cause the U1087 code?

Yes, a weak or dead battery can disrupt communication between control modules, potentially triggering the code.

9. Can I clear the U1087 code without fixing the issue?

Clearing the code without repairing the underlying issue may cause it to return and could lead to further complications.

10. How much does it cost to fix the U1087 code?

Repair costs vary depending on the issue but typically range from $100 for simple wiring repairs to $1,000 or more if a control module needs replacement.