2021-2024 Audi EPC Light and Fuel Level Sensor DTC TSB

Symptoms

Owners of affected Audi vehicles may observe an "EPC warning" and a "fuel system warning" displayed in the instrument cluster. These warnings indicate an issue with the vehicle's engine power control or 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 (address word 0046):

• B10581B: Fuel level sensor 2 Resistance too high with symptom number 65698.
• B103E1B: Fuel level sensor 1 Resistance too high with symptom number 65694.

Diagnosis and Technical Background

Audi's technical background for TSB 2070211/2 explains that deposits can build up on the tank senders, causing inaccurate readings and triggering the EPC and fuel system warnings. A production solution involving an increased debounce time was implemented in week 50 of 2023 to mitigate this issue in newer vehicles.

Repair Procedure Summary

Addressing the "Audi Q8 EPC light" and related fuel sensor issues typically involves a multi-step process:

1. Software Update: First, technicians must follow the instructions in TSB 2011732 for Software Version Management (SVM) operating procedures. The J393 Comfort System Central Control Module (address 0046) then needs to be updated using SVM action code 46A033.
2. Sensor Replacement (if needed): After the software update, the complaint should be re-checked. If the issue persists:
   • For issues with tank sender 1 (DTC B103E1B), if the software update does not resolve the problem, tank sender 1 and potentially the entire fuel tank may need replacement.
   • For issues with tank sender 2 (DTC B10581B), if the software update does not resolve the problem, tank sender 2 should be replaced.

This Technical Service Bulletin (TSB) 2070211/2 supersedes TSB 23-59 dated May 4, 2023, and was revised on July 10, 2024, to include updated model years, conditions, technical background, product solutions, service directions, warranty information, and parts lists.

Required Parts and Tools

Technicians will need to consult ETKA (Electronic Parts Catalog) for the most current information regarding parts and fasteners. Specific parts that may be required include:

• Fuel level sender 1 (if needed)
• Fuel tank (if needed)
• Fasteners, bolts, nuts, and screws as needed per the repair manual.

Warranty Information

This repair is covered under Audi's warranty for up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, the G10 claim type applies, and ownership must be verified. If the vehicle is outside of its warranty period, this Technical Service Bulletin serves as informational guidance, and the repair costs would be the owner's responsibility. The service number for this bulletin is 2015, and the damage code is 0040. Labor operations include replacing the fuel tank (2010 55XX), software updates (0151 0060), and charging the battery (2706 8950).

What Owners Should Know

If your Audi is displaying an "EPC warning" or "fuel system warning" along with DTCs B10581B or B103E1B, it is recommended to have your vehicle inspected by an authorized Audi service center. They will be able to perform the necessary diagnostics and apply the software update or replace components as outlined in TSB 2070211/2 to resolve the "Audi Q8 EPC light" issue.

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Source: NHTSA ID: 11005860, TSB ID: 2070211/2