AutoCodes – Volkswagen – U1123 Volkswagen

U1123 Volkswagen 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 Volkswagen 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 30,550

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

What does this mean?

What are the Possible Causes of the DTC U1123 Volkswagen?

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 Volkswagen?

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 Volkswagen 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 Volkswagen Code

1. What are the common symptoms of OBDII code U1123 (Volkswagen)?

The common symptoms of OBDII code U1123 in a Volkswagen are issues with the odometer display, incorrect mileage readings, or a complete loss of odometer data.

2. What does the OBDII code U1123 (Volkswagen) mean?

OBDII code U1123 in a Volkswagen indicates that there is invalid or missing data for the odometer, which can impact the accuracy of the mileage reading.

3. What are the possible causes of OBDII code U1123 (Volkswagen)?

Possible causes of OBDII code U1123 in a Volkswagen include a faulty odometer display unit, damaged wiring or connectors related to the odometer system, or a communication error between the odometer module and other vehicle modules.

4. How can I diagnose OBDII code U1123 (Volkswagen)?

Diagnosing OBDII code U1123 in a Volkswagen involves checking the connections to the odometer display, inspecting the wiring for any damage, and using a diagnostic tool to scan for communication errors between the modules.

5. Can I still drive my Volkswagen with OBDII code U1123?

It is generally safe to drive your Volkswagen with OBDII code U1123, but it is recommended to address the issue promptly to ensure the accuracy of your odometer readings.

6. How can I repair OBDII code U1123 (Volkswagen)?

To repair OBDII code U1123 in a Volkswagen, you may need to replace the faulty odometer display unit, repair any damaged wiring or connectors, or reprogram the odometer module to restore proper data communication.

7. Is OBDII code U1123 (Volkswagen) a serious problem?

OBDII code U1123 is not a serious safety concern, but it can affect the accuracy of your odometer readings and may lead to issues with tracking your vehicle's mileage.

8. Can I reset OBDII code U1123 (Volkswagen) with a simple reboot?

In some cases, resetting OBDII code U1123 in a Volkswagen by disconnecting the battery for a few minutes may clear the error temporarily, but it is important to address the root cause of the issue for a permanent fix.

9. How much does it cost to fix OBDII code U1123 (Volkswagen)?

The cost to fix OBDII code U1123 in a Volkswagen can vary depending on the exact cause of the issue, but it may involve replacing the odometer display unit, repairing wiring, or reprogramming the module, which can range from a few hundred to a thousand dollars.

10. Will OBDII code U1123 (Volkswagen) cause my vehicle to fail an emissions test?

OBDII code U1123 related to odometer data is unlikely to cause your Volkswagen to fail an emissions test, as it does not directly impact the vehicle's emissions control systems. However, it is still important to address the issue for accurate mileage tracking.