AutoCodes – Generic – U1223

U1223 Code - Invalid Or Missing Data For Interior Lamps

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: U1223 indicates Invalid Or Missing Data For Interior Lamps.
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 7,255

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 May 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1223 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 U1223 - Invalid Or Missing Data For Interior Lamps - AutoCodes.com — U1223 Code - Invalid Or Missing Data For Interior Lamps

What does this mean?

What are the Possible Causes of the DTC U1223?

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

How to Fix the DTC U1223?

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 U1223 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.

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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 U1223 Code

1. What are common symptoms of OBDII code U1223 (Invalid Or Missing Data For Interior Lamps)?

The common symptoms include interior lights not working properly, flickering interior lights, or complete failure of interior lamps to illuminate.

2. What are the possible causes of OBDII code U1223?

The code U1223 can be triggered by issues such as a faulty interior lamp control module, damaged wiring or connectors related to the interior lamps, or a malfunctioning body control module.

3. How can I diagnose the cause of OBDII code U1223?

To diagnose the cause of U1223, you can start by checking the interior lamp fuse, inspecting the wiring harness for any visible damage, and using a diagnostic scan tool to retrieve additional fault codes and data related to the interior lamps.

4. Can a blown fuse cause OBDII code U1223?

Yes, a blown fuse related to the interior lamps can trigger code U1223. It is recommended to check and replace any blown fuses as part of the diagnosis process.

5. How can I repair OBDII code U1223?

Repairing code U1223 may involve replacing a faulty interior lamp control module, repairing damaged wiring or connectors, resetting the body control module, or addressing any other underlying issue causing the invalid or missing data for interior lamps.

6. Are there any DIY tips for fixing OBDII code U1223?

DIY tips for addressing code U1223 include checking and replacing fuses, inspecting and repairing damaged wiring, and ensuring all connectors related to the interior lamps are securely connected.

7. Is it safe to continue driving with OBDII code U1223?

It is generally safe to continue driving with code U1223, but it is important to address the issue promptly to prevent any potential safety hazards or further damage to the interior lamp system.

8. Can a loose connection trigger OBDII code U1223?

Yes, a loose or poor connection in the interior lamp system can potentially trigger code U1223. Make sure to check and secure all connections during the diagnostic process.

9. How do I reset OBDII code U1223?

You can reset code U1223 using a diagnostic scan tool capable of clearing trouble codes. Once the underlying issue is addressed, clearing the code should reset the system.

10. Will fixing OBDII code U1223 require professional assistance?

Depending on the cause of code U1223 and your level of automotive expertise, fixing the issue may require professional assistance, especially if it involves complex wiring repairs or module replacements.