2021-2026 Audi Driver Assist System Fault DTC C12D5FA TSB

Owners of certain 2021-2026 Audi A6, A7, A8, Q7PA, Q8, and e-tron models may experience intermittent warnings related to their vehicle's driver assistance systems. These warnings, such as an Audi driver assist system fault C12D5FA, can appear in the instrument cluster, causing concern about the functionality of crucial safety features. Audi Technical Service Bulletin (TSB) 2076396/2 provides specific guidance for diagnosing and addressing this particular intermittent issue.

This TSB clarifies that despite initial diagnostic recommendations, replacing hardware components is not the correct fix for this sporadic fault. Instead, the resolution involves a specific software action to clear the diagnostic trouble code, ensuring owners avoid unnecessary repairs and costs.

Revision History

Audi TSB 2076396/2 has undergone revisions to ensure accuracy and include relevant model years:

• Revision 1 (December 17, 2024): Initial publication of the bulletin.
• Revision 2 (October 17, 2025): Revised header to add additional model years to the scope of the bulletin.

It's important to note the release date of October 17, 2025, for Revision 2, indicating future applicability or a pre-release for upcoming models.

Symptoms You Might Notice

If your Audi is affected by this issue, you might observe one or more of the following messages appearing intermittently in your instrument cluster. These messages indicate that the driver assist systems are unavailable or restricted:

• "Audi adaptive light: system fault."
• "Audi pre sense: system fault."
• "Adaptive cruise assist: restricted."
• "Adaptive cruise assist: predictive control currently restricted."

These warnings typically indicate that the driver assist systems are temporarily unavailable or restricted. A key characteristic of this particular fault is its intermittent nature; the messages often disappear after the ignition is switched off and back on, or after the vehicle enters a bus sleep cycle, with the systems becoming available again. This intermittent behavior is a crucial diagnostic clue for the Audi driver assist system fault C12D5FA.

Fault Codes and Diagnostic Information

When these symptoms occur, a diagnostic scan of your vehicle will likely reveal a specific diagnostic trouble code (DTC) stored in the system. The TSB identifies the following:

Diagnostic Address	Diagnostic Trouble Code	Fault Symptom	Storage State
00A5 - Front sensor for driver assistance systems	C12D5FA: Driver Assistance Systems Control Module Image processing processor not reacting (symptom number 221281)	Intermittent	Intermittent

This DTC C12D5FA indicates that the Driver Assistance Systems Control Module, specifically the -J1121- control unit (address word 00A5), is intermittently reporting that its image processing processor is not reacting. This is a sporadic fault, meaning it does not occur constantly and may resolve itself temporarily after an ignition cycle or bus sleep.

Diagnosis and Trigger Conditions

The primary diagnostic finding for this issue is the intermittent storage of DTC C12D5FA in the Driver assist systems control unit -J1121-. The fault is characterized by the image processing processor within the control module temporarily failing to react. Because the fault is intermittent and resolves itself after an ignition cycle or bus sleep, it points to a software or communication glitch rather than a permanent hardware failure. Guided Fault Finding (GFF) systems might initially recommend replacing the Driver assist systems control unit -J1121-, but this TSB explicitly overrides that recommendation for this specific intermittent condition.

Important Warnings for Owners and Technicians

Audi has issued critical warnings within TSB 2076396/2 to prevent incorrect and costly repairs. These warnings are crucial for both technicians and owners to understand:

• "This TSB does not apply in the event of an active/static issue. The TSB also does not apply if the DTC listed above is not stored." This means the bulletin is only relevant for intermittent occurrences of DTC C12D5FA, not for persistent, active faults or if a different diagnostic trouble code is present. If the fault is constant or a different code appears, further diagnosis beyond this TSB is required.
• "Do not replace any parts! Replacing parts will not remedy the customer complaint." This is a crucial instruction. Despite what a guided fault finding (GFF) system might initially suggest, replacing components like the Driver assist systems control unit -J1121- will not fix this specific intermittent Audi driver assist system fault C12D5FA.
• "Replacing parts or attempting repairs will not fix the problem. Unjustified labor/replacement parts will be debited." This warning emphasizes that any attempt to replace parts for this particular intermittent issue will be ineffective and could result in charges to the owner or dealership for unjustified work. This protects owners from being upsold unnecessary repairs.

Repair Procedure Summary

Contrary to what some diagnostic systems might suggest, the official repair procedure outlined in Audi TSB 2076396/2 for an intermittent Audi driver assist system fault C12D5FA is straightforward and does not involve replacing any hardware. The TSB explicitly states the following single step:

1. Delete the DTC "C12D5FA: Driver assistance systems control module Image processing processor not reacting” (symptom number 221281)".

This action clears the stored fault code from the control unit's memory. No parts replacement, software update (beyond clearing the code), or complex repair steps are required. The TSB highlights that attempting to replace parts will not resolve the underlying intermittent condition and will lead to unnecessary costs.

Warranty Information

For vehicles still under warranty, this repair should be covered. The TSB specifies the following details for warranty claims, which must be submitted in accordance with the Audi Warranty Policies and Procedures Manual:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 9093
• Damage Code: 0039
• Labor Operations:
  • Charge Battery: 2706 8950 (See SRT with associated operations)
  • GFF (Guided Fault Finding): 0150 0000 (Time stated on the diagnostic protocol)
• Claim Comment: As per TSB 2076396/2.

All warranty claims are subject to review or audit by Audi Warranty. If your vehicle is outside of its warranty period, this Technical Service Bulletin is informational only. However, understanding the correct procedure can help you avoid being charged for unnecessary parts replacement if you encounter this specific intermittent Audi driver assist system fault C12D5FA.

Additional Information

All part and service references provided in this TSB (2076396) are subject to change and/or removal. Audi advises technicians to always check with their Parts Department and/or ETKA for the latest information and parts bulletins. They should also consult the Repair Manual for fasteners, bolts, nuts, and screws that require replacement during any repair, though for this specific TSB, no parts replacement is indicated.

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Source: NHTSA ID 11025344