AutoCodes – Generic – U1203

U1203 Code - Invalid Or Missing Data For Windows

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: U1203 indicates Invalid Or Missing Data For Windows.
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 6,514

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 03, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1203 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 U1203 - Invalid Or Missing Data For Windows - AutoCodes.com — U1203 Code - Invalid Or Missing Data For Windows

What does this mean?

What are the Possible Causes of the DTC U1203?

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

How to Fix the DTC U1203?

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 U1203 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 U1203 code?

Need more information on how to fix the U1203 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1203 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 U1203 Code

1. What are common symptoms associated with OBDII code U1203?

- Common symptoms include power window malfunctions, unresponsive window controls, and issues with window automation features.

2. What causes the U1203 code to be triggered?

- The U1203 code is usually triggered when there is invalid or missing data communication between the power window control module and the vehicle's main computer.

3. How can I diagnose the U1203 code related to invalid or missing data for windows?

- Diagnosing the U1203 code involves using a diagnostic scanner to retrieve the code, checking the power window fuses, inspecting the wiring harness for any damage, and testing the power window control module.

4. Are there any simple repair tips for resolving the U1203 code?

- Simple repair tips for resolving the U1203 code include checking and replacing any blown fuses, ensuring the wiring connections are secure, and resetting the power window control module.

5. Can a DIY enthusiast fix the U1203 code issue at home?

- While some basic troubleshooting steps can be done at home, fixing the U1203 code may require specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

6. Is it safe to continue driving with the U1203 code present?

- It is generally not recommended to continue driving with the U1203 code present, as power window malfunctions can compromise safety and convenience while operating the vehicle.

7. How much does it typically cost to repair the U1203 code issue?

- The cost of repairing the U1203 code can vary depending on the extent of the issue, parts needed for replacement, and labor charges. It is advisable to obtain quotes from auto repair shops for an accurate estimate.

8. Can a faulty power window motor trigger the U1203 code?

- While a faulty power window motor itself may not trigger the U1203 code, it can contribute to power window issues that may lead to communication errors between the control module and the main computer.

9. Will resetting the vehicle's computer system clear the U1203 code?

- Resetting the vehicle's computer system may temporarily clear the U1203 code, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is crucial to diagnose and fix the root cause of the problem.

10. Are there any recalls or technical service bulletins related to the U1203 code?

- It is advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to the U1203 code to see if there are known issues or solutions available.