AutoCodes – Generic – U1093

U1093 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: U1093 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 12,051

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 U1093 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 U1093 - Invalid Or Missing Data For Primary Id - AutoCodes.com — U1093 Code - Invalid Or Missing Data For Primary Id

What does this mean?

What are the Possible Causes of the DTC U1093?

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

How to Fix the DTC U1093?

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 U1093 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 U1093 code?

Need more information on how to fix the U1093 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1093 code diagnosed by a professional: Find a repair shop in your area

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 U1093 Code

1. What are the common symptoms of OBDII code U1093?

- Common symptoms include the Check Engine light illuminating on the dashboard, issues with vehicle performance, and potential difficulty starting the vehicle.

2. What causes the OBDII code U1093 to trigger?

- The U1093 code is triggered when the primary ID data being transmitted between modules in the vehicle is either missing or invalid.

3. How serious is the OBDII code U1093?

- While the U1093 code itself may not directly impact the drivability of the vehicle, it is important to address it promptly as it indicates a communication issue between vehicle modules.

4. What are some possible repair tips for OBDII code U1093?

- Check and ensure all connections between modules are secure, inspect wiring for any damage, reset the code and see if it returns, and consider seeking professional diagnostics if needed.

5. Can a DIY enthusiast repair the OBDII code U1093?

- Depending on the root cause of the code, some DIY enthusiasts with experience in automotive repair and diagnostics may be able to address the U1093 code by following repair tips and using appropriate tools.

6. How can a mechanic diagnose the OBDII code U1093?

- Mechanics typically use a scan tool to read the code, check for related codes, inspect the wiring and connections, and perform further tests to identify the specific cause of the communication error.

7. Will driving with the OBDII code U1093 cause further damage to the vehicle?

- Continuing to drive with the U1093 code present may not cause immediate damage, but unresolved communication issues between modules can potentially lead to more serious problems over time.

8. Is it safe to clear the OBDII code U1093 and ignore it?

- Clearing the code may temporarily turn off the Check Engine light, but if the underlying issue causing the code is not addressed, it is likely to trigger the code again and should not be ignored.

9. How much does it cost to repair the OBDII code U1093 at a repair shop?

- The cost of repairing the U1093 code can vary depending on the specific cause, labor rates, and parts needed. It is advisable to consult with a repair shop for an accurate estimate.

10. Can weather or environmental factors trigger the OBDII code U1093?

- While rare, extreme weather conditions or environmental factors could potentially affect the communication between modules in a vehicle and lead to the U1093 code being triggered.