2021-2025 Audi A4/A5/Q5 Camera Coded Incorrectly TSB

Symptoms

Owners of affected 2021-2025 Audi A4, A5, Q5, S4, S5, RS 5, and SQ5 models may experience a diagnostic trouble code (DTC) related to the Front Camera for Driver Assist Systems. Specifically, the vehicle's onboard diagnostic system may store DTC U101400, indicating that a control module has been coded incorrectly. This fault is typically found statically within the Front Camera for Driver Assist Systems -R242- control unit, which is identified by address word 00A5.

Fault Codes / DTCs

When diagnosing this issue, technicians will find the following DTC:

Code	Description	Module	Symptom Code
U101400	Control module coded incorrectly	Front Camera for Driver Assist Systems -R242- (address word 00A5)	646

Technical Background

Audi Technical Service Bulletin 2076008/1 explains that the workshop actions performed during a campaign can inadvertently reset the coding of the front camera to its factory default value. This reset can lead to the DTC U101400 being stored. The presence of this DTC suggests that the vehicle is receiving signals from control units that are not actually installed from the factory. Examples include signals from the trailer control unit, the lane change assist system, or the adaptive cruise control system.

Another potential cause for the Audi A5 camera U101400 fault is a deviating coding in other control units within the vehicle's network. This means that even if the front camera itself is correctly coded, an incorrect setting in a different module could trigger the U101400 DTC.

Diagnosis and Repair Procedure

To address the Audi A5 camera U101400 and related issues, technicians should follow a specific diagnostic and repair process:

1. Verify Vehicle Equipment: Check if the vehicle is equipped with features or equipment that are not listed in the vehicle data as shown in Elsa, Audi's electronic service information system. This helps identify any discrepancies between the vehicle's actual configuration and its documented build.
2. Inspect for Unexpected Modules: For example, technicians should check if the trailer control module (address word 0069) can be reached using ODIS (Offboard Diagnostic Information System), even if Elsa indicates that no trailer hitch is installed on the vehicle. The presence of such a module, even if physically absent, can contribute to the incorrect coding fault.
3. Check and Reset Control Module Coding: Review the coding in all other relevant control modules, such as the instrument cluster. If any discrepancies or incorrect coding are found, the coding should be reset using the "check control module configuration" test plan available in ODIS.

This procedure aims to ensure that all control units are correctly configured and that the Front Camera for Driver Assist Systems -R242- operates as intended, resolving the DTC U101400.

Important Warnings

Audi advises that non-OEM modifications or installations of products not available through the Audi Genuine Accessories program are not supported. Audi of America cannot provide assistance for such installations. If your vehicle has aftermarket modifications, you should contact the third party who performed the modification for support regarding any related issues.

Warranty Information

Audi Technical Service Bulletin 2076008/1 is provided for informational purposes only. This bulletin is not applicable to any Audi Warranty claims, meaning that any diagnostic or repair costs associated with this issue may not be covered under standard Audi warranty terms.

Owner Action

If you are experiencing the Audi A5 camera U101400 fault code or any related driver assist system warnings, it is recommended to schedule an appointment with an authorized Audi service center. They have the necessary diagnostic tools and training to properly identify and correct the coding issue in your vehicle's Front Camera for Driver Assist Systems -R242- and other related control units.

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Source: NHTSA ID: 11011305