AutoCodes – Generic – U1123

U1123 Code - Invalid Or Missing Data For Odometer

Quick Answer

This is a manufacturer specific fault code and can be used for several different faults, depending upon what the manufacturer wants to use it for. Common causes include Faulty / intermittent vehicle speed sensor / connections, J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground, Faulty / intermittent connection at the Powertrain Control Module (PCM). 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: U1123 indicates Invalid Or Missing Data For Odometer.
Common causes: Common causes include Faulty / intermittent vehicle speed sensor / connections, J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground, Faulty / intermittent connection at the Powertrain Control Module (PCM).
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 38,012

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1123 Description

This is a manufacturer specific fault code and can be used for several different faults, depending upon what the manufacturer wants to use it for. Controllers communicate over the Serial Communication Protocol (SCP) bus network, also known as J1850 bus, or Controller Area Network or CAN Bus. These bus communication systems may or may not be fault tolerant, which means any type of intermittent/loose connection between these controllers could cause communication to stop. When these controllers are unable to communicate with each other at any time while the ignition switch is turned on, code U1123 will set.

OBDII Code U1123 - Invalid Or Missing Data For Odometer - AutoCodes.com — U1123 Code - Invalid Or Missing Data For Odometer

What does this mean?

What are the Possible Causes of the DTC U1123?

Faulty / intermittent vehicle speed sensor / connections
J1850 / SCP / CAN Bus wiring intermittently open, shorted to power or ground
Faulty / intermittent connection at the Powertrain Control Module (PCM)
Faulty / intermittent connection at the Anti-Lock Brake Module (ABS)

How to Fix the DTC U1123?

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 does this mean?

Code Tech Notes

This is typically an electrical wiring connection issue, either at the engine controller or at the sensors being monitored by the manufacturer.
It can occur if the wiring to the vehicle speed sensor breaks or the sensor itself has issues.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1123 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 U1123 code?

Need more information on how to fix the U1123 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1123 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1123 Audi — Invalid Or Missing Data For Odometer
U1123 Volkswagen — Invalid Or Missing Data For Odometer

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 U1123 Code

1. What are the common symptoms of OBDII code U1123 (Invalid Or Missing Data For Odometer)?

- Common symptoms include inaccurate odometer readings, issues with the speedometer, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U1123?

- The code U1123 can be caused by a faulty instrument cluster, damaged wiring or connectors related to the odometer system, or issues with the vehicle's communication network.

3. How can I diagnose the OBDII code U1123?

- Diagnosing the code U1123 involves using a diagnostic scanner to retrieve the code and then checking the instrument cluster, wiring, and connectors for any visible damage or issues.

4. What are some repair tips for fixing OBDII code U1123?

- Repair tips may include checking and repairing any damaged wiring or connectors, resetting the instrument cluster, or seeking professional help to reprogram or replace the instrument cluster if necessary.

5. Can I drive my vehicle with the OBDII code U1123?

- It is generally safe to drive the vehicle with the U1123 code, but it is recommended to address the issue promptly to avoid any potential inaccuracies in odometer readings.

6. How much does it cost to repair OBDII code U1123?

- The cost of repairing the U1123 code can vary depending on the underlying cause and the extent of the repairs needed. It is advisable to consult a professional mechanic for an accurate estimate.

7. Will resetting the OBDII code U1123 make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue is not addressed, the code is likely to reappear. It is important to diagnose and fix the root cause of the problem.

8. Can a DIY enthusiast fix OBDII code U1123 at home?

- Depending on the DIYer's skill level and access to tools, some aspects of diagnosing and repairing the U1123 code may be possible at home. However, complex issues may require professional assistance.

9. How long does it take to repair OBDII code U1123?

- The repair time for the U1123 code can vary based on the complexity of the issue and the availability of parts. Simple fixes may take a few hours, while more involved repairs could take longer.

10. Is the OBDII code U1123 a common issue in vehicles?

- The U1123 code related to invalid or missing data for the odometer is not as common as some other OBDII codes, but it can still occur in vehicles with instrument cluster or communication system problems.