2021-2024 Audi A6 Gearbox Mode$0A Error TSB

Owners of certain 2021-2024 Audi vehicles, including the Audi A6, may encounter issues related to persistent diagnostic trouble codes (DTCs) in their gearbox control unit or an illuminated gearbox warning lamp. This is often referred to as a "Mode$0A error" when found in the permanent DTC memory during an inspection or emissions test. Audi Technical Service Bulletin (TSB) 2076084/1 provides a solution for these issues, specifically targeting DL501, DL382/DL382E, and DQ500 gearboxes. This TSB, dated December 2, 2024, outlines the necessary software updates to resolve these persistent fault entries.

Symptoms

Owners typically notice one of two primary symptoms related to the Audi A6 gearbox Mode$0A error:

• During an I/M Inspection or Emissions Test, the Permanent DTC memory is read out, and a "Mode$0A entry" is found in the gearbox control unit, indicating one or more specific DTCs.
• The "gearbox warning lamp lights up in the instrument cluster", signaling a potential issue with the transmission system.

Fault Codes / DTCs

TSB 2076084/1 identifies several DTCs that may be stored in the gearbox control unit (diagnostic address 0002), depending on the specific gearbox series. These codes often relate to clutch slippage or gear actuator engagement issues, and are logged as static or intermittent event memory entries.

For Gearbox Series DL382/382E

DTC	Symptom Code	Name of Diagnosis Function
P081100	20870	Clutch 1 excessive clutch slippage
P081E00	20872	Clutch 2 excessive clutch slippage
P288200	20954	Clutch 0 excessive clutch slippage (PHEV only)
P187A00	22331	Gear actuator 1, engagement process not successful
P187B00	22335	Gear actuator 2, engagement process not successful
P187C00	22334	Gear actuator 3, engagement process not successful
P187D00	22333	Gear actuator 4, engagement process not successful

For Gearbox Series DL501

DTC	Symptom Code	Name of Diagnosis Function
P17CF00	18444	Clutch 1 slip too high
P17CF00	8958	Clutch 1 slip too high
P17D000	18446	Clutch 2 slip too high
P17D000	8963	Clutch 2 slip too high
P284D00	23683	Shift Fork "A" Unrequested Movement
P284E00	23682	Shift Fork "B" Unrequested Movement
P284F00	23685	Shift Fork "C" Unrequested Movement
P285000	23684	Shift Fork "D" Unrequested Movement

For Gearbox Series DQ500

DTC	Symptom Code	Name of Diagnosis Function
P081100	10895	Clutch 1 excessive clutch slippage
P081E00	10896	Clutch 2 excessive clutch slippage

Important Warnings for Owners

Audi has issued critical advisories regarding this TSB 2076084/1 that owners should be aware of:

• The software update for the 0002 control unit should only be performed after all mechanical repairs addressing the root cause of the DTC have been completed. Any underlying mechanical issue causing these DTCs is not covered under this TSB or the U750 Warranty Extension Program.
• If non-genuine retrofits or modifications have been made to the vehicle by third parties (e.g., tuning), neither Audi of America nor its authorized service providers will accept liability for any damage that may result from updating the software or failing to do so. It is crucial to make a note of any such modifications on the job order.
• Customers who have not failed an I/M inspection are generally unlikely to be affected by this specific issue.
• Only the flashing procedure itself may be billed under warranty. Other diagnostic or repair work on the gearbox is not part of this TSB and therefore cannot be billed here.

Repair Procedure Summary

The primary repair for the Audi A6 gearbox Mode$0A error involves updating the software of the gearbox control unit (diagnostic address 0002). This procedure must be carried out by a qualified technician using specific SVM (Software Version Management) codes. All flashing procedures must be performed using the corresponding SVM code, ensuring the correct gearbox is selected and the software version is accurate.

1. Preliminary Check: Before performing any work, technicians must check whether there are any other relevant TSBs for the event memory entries and complete those first.
2. Mechanical Repairs: Ensure any mechanical issues causing the DTCs are resolved before the software update.
3. Software Update for DL382/382E Gearboxes: The software for DL382 and DL382E gearboxes is updated using SVM code 02A231. Only one SVM code is necessary for these gearbox types.
4. Software Update for DL501 Gearboxes: For DL501 gearboxes, a reverse update to a lower software version may be necessary before installing the target version. If the current software version is already low, a single flashing procedure using SVM code 02A233 is sufficient. Otherwise, a reverse update using SVM code 02A232 is performed first, followed by the target update with SVM code 02A233. Specific software part numbers requiring this two-step process include:
   • 4G0 927 166 F (Software version 7)
   • 4G1 927 156 S (Software version 14)
   • 4G9 927 156 C (Software version 7)
   • 8K0 927 156 M (Software version 12)
   • 8K1 927 156 AD (Software version 6)
   • 8K1 927 156 C (Software version 2)
   • 8K1 927 156 K (Software version 13)
   • 8K1 927 156 S (Software version 7)
   • 8K2 927 156 M (Software version 12)
   • 8K2 927 156 S (Software version 4)
   • 8K5 927 156 D (Software version 5)
   • 8K5 927 156 J (Software version 9)
   • 8K5 927 156 R (Software version 2)
   • 8K9 927 156 A (Software version 2)
   • 8T0 927 156 D (Software version 7)
   • 8T0 927 156 F (Software version 12)
   • 8T0 927 156 H (Software version 6)
   • 8T0 927 156 P (Software version 4)
5. Software Update for DQ500 Gearboxes: For the DQ500 gearbox, a reverse update to a lower version is always necessary first. This is done using SVM code 02A232, followed by the target update with SVM code 02A233. The specific software part number mentioned is 0DL 906 558 L (Software version 0562).
6. Post-Update Configuration: After the software update, various control units must be reconfigured to ensure correct function and compatibility with other vehicle systems.

Warranty Information

For eligible vehicles, Audi provides specific guidelines for warranty claims related to this TSB 2076084/1:

• Claim Type: Informational only if the vehicle is outside of any warranty. Please refer to AWA-24-13 for more information.
• Service Number: 3730
• Damage Code: 0039
• Manufacturer Code: AUN
• Labor Operations:
  • Software Update: 0151 0010 (Refer to SRT with associated operations)
  • Software Update: 0151 0060 (Labor according to diagnostic log)
• Claim Comment: "As per TSB 2076084/1"
• All warranty claims must comply with the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty.

Owner Action

If you are experiencing a "Mode$0A entry" or the "gearbox warning lamp lights up in the instrument cluster" in your affected Audi, particularly an Audi A6 gearbox Mode$0A error, it is recommended to schedule an appointment with an authorized Audi service center. Be prepared to inform the technician about any aftermarket modifications or non-genuine components installed in your vehicle, as this may impact warranty coverage for the software update.

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Source: NHTSA ID: 10255850