AutoCodes – Audi – U1123 Audi

U1123 Audi 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 Audi 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 16,917

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

What does this mean?

What are the Possible Causes of the DTC U1123 Audi?

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 Audi?

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 Audi 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 U1123 Audi Code

1. What are the common symptoms of OBDII code U1123 in an Audi related to invalid or missing data for the odometer?

- The common symptoms include inaccurate odometer readings, malfunctioning trip meters, and issues with other vehicle data display functions.

2. What are the possible causes of OBDII code U1123 in an Audi indicating invalid or missing data for the odometer?

- Possible causes include a faulty instrument cluster, damaged wiring or connectors leading to the cluster, or a communication error between the cluster and other modules.

3. How can I diagnose the issue causing OBDII code U1123 in my Audi related to the odometer data problem?

- Diagnose the problem by checking the instrument cluster connections, inspecting the wiring harness for any damage, and using a diagnostic scanner to communicate with the cluster and other relevant modules.

4. Can OBDII code U1123 in an Audi be repaired by resetting the error code alone?

- Resetting the error code may temporarily clear the warning, but it will not solve the underlying issue causing the invalid or missing data for the odometer. Proper diagnosis and repair are necessary.

5. Are there any DIY repair tips for addressing OBDII code U1123 in an Audi due to incorrect odometer data?

- DIY repair tips include checking and cleaning the instrument cluster connections, inspecting the wiring for visible damage, and ensuring all modules are communicating properly through a diagnostic tool.

6. Is it safe to continue driving an Audi with OBDII code U1123 related to the odometer data issue?

- While the vehicle may still be operable, it is not recommended to ignore the issue as it may lead to inaccurate mileage tracking and potential complications with other vehicle systems in the long run.

7. How much does it typically cost to repair OBDII code U1123 in an Audi concerning invalid or missing data for the odometer?

- Repair costs can vary depending on the specific cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a software update fix OBDII code U1123 in an Audi associated with odometer data problems?

- In some cases, a software update provided by the manufacturer may address communication errors causing the odometer data issue, but it's essential to consult with a certified technician for guidance.

9. Will OBDII code U1123 in an Audi affect the vehicle's performance or safety?

- While the code itself may not impact performance or safety directly, addressing the underlying issue promptly is crucial to maintain accurate vehicle data and ensure proper functionality of related systems.

10. How long does it typically take to repair OBDII code U1123 in an Audi linked to invalid or missing data for the odometer?

- The repair time can vary based on the diagnosis complexity and availability of parts, but it may take a few hours to a full day for a qualified mechanic to address the issue effectively.