2022-2025 Audi Q8 EPC Light On with DTC B10581B

Symptoms

Owners of affected Audi models may observe an "EPC warning" and a "fuel system warning" displayed in the instrument cluster. These warnings indicate a potential issue with the fuel delivery system.

Fault Codes / DTCs

When diagnosing this issue, technicians may find the following Diagnostic Trouble Codes (DTCs) stored in the Comfort System Central Control Module (J393, diagnostic address 0046):

Code	Description
B10581B	Fuel level sensor 2 Resistance too high (symptom number 65698)
B103E1B	Fuel level sensor 1 Resistance too high (symptom number 65694)

Diagnosis

The root cause of the "Audi Q8 EPC light B10581B" and related fuel system warnings is often the buildup of deposits on the tank senders. This buildup can lead to inaccurate resistance readings from the fuel level sensors, triggering the DTCs and warning lights. Audi implemented a production change with optimized software latency and debounce time (SVM 46A033) from week 50/2023 onward to address this.

Repair Procedure Summary

Audi Technical Service Bulletin 2070211/3 outlines a multi-step service procedure to resolve the EPC light and fuel level sender DTCs. The primary solution involves software updates and, if necessary, replacement of the affected fuel level senders.

1. Initial Steps: Technicians must follow instructions from TSB 2011732 for Software Version Management (SVM) operating procedures and TSB 2047812 for using the SD Creator to obtain software updates via MirrorServer.
2. J393 Control Module Update: The J393 control module (diagnostic address 0046) should be updated using the appropriate SVM action code.
3. Fuel Level Sender Software Update (SVM 46A033):
   • For vehicles from model years 2016-2020, 2021-2023, and 2024-2025, if a tank sender 1 or tank sender 2 issue is present, technicians should run SVM code 46A033. After the update, the complaint should be re-checked. If the issue persists, the tank sender 1 (or both tank and tank sender 1 for sender 2 issues) must be replaced.
4. Audi Virtual Cockpit Software Update (SVM 17A053):
   • Vehicles with Audi virtual cockpit (diagnostic address 0017) running software versions 0022, 0053, 0055, 0056, 0058, 0059, 0060, or 0063 require an update to software version 0065 using SVM code 17A053. Similarly, vehicles with software versions 0107, 0111, 0115, 0116, 0117, 0118, or 0119 need an update to software version 0122 using SVM code 17A053.
   • During the update process, the workshop tester may display messages such as "... please insert update medium with the following part number..." or "... Hold the vehicle key to the transponder...". Technicians must insert the USB stick into a vehicle USB port and hold the key as instructed until the update is complete.

Important Warnings

For 2021-2023 model year vehicles equipped with high-voltage components, it is crucial to unplug the high-voltage charging cable before entering the SVM code for a software update. Failure to do so can lead to damage to the high-voltage battery if it charges during the update process.

Required Tools or Parts

To perform the necessary repairs, the following items may be required:

• USB Stick: For updating the Audi virtual cockpit software, a USB stick with part number 8W6 906 961 AE is needed. This can be ordered or created using the SD creator tool.
• Fuel Level Sender 1: If the software update does not resolve the issue, a new fuel level sender 1 may be required.
• Fuel Tank: In cases where tank sender 2 is faulty and the software update is insufficient, both the tank and tank sender 1 may need replacement.
• Fasteners, Bolts, Nuts, and Screws: As needed for repair, per ETKA/ELSA.

Warranty Information

Warranty claims related to this issue, identified by TSB 2070211/3, should be submitted in accordance with the Audi Warranty Policies and Procedures Manual. The service number for claims is 2010, and the damage code is 0010. Labor operations may include replacing the fuel tank, removing and installing the fuel gauge sender, performing software updates (including DTC checks), and charging the battery.

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Source: NHTSA ID: 11017669