2021 Audi A6 Fuel Gauge Implausible TSB 2063377/1

Owners of certain 2021 Audi models may experience an Audi A6 fuel gauge implausible condition where the vehicle runs out of fuel despite the gauge indicating a quarter tank or more. This can also manifest as the vehicle juddering due to insufficient fuel supply. Audi Technical Service Bulletin (TSB) 2063377/1 addresses this specific problem.

Symptoms

If you own a 2021 Audi A6, A7, S6, S7, RS 6 Avant, or RS 7, you might observe the following symptoms:

• The vehicle stops due to a lack of fuel, even though the fuel gauge in the cluster still shows ¼ of a tank or more, and there are miles of range remaining.
• The vehicle experiences juddering or hesitation.
• The fuel level is implausible.

Fault Codes / DTCs

When diagnosing this Audi A6 fuel gauge implausible issue, technicians may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the Engine Control Module (ECM), J623 (address word 0001):

Code	Description
P008700	Fuel Rail/System Pressure – Too Low
P046100	Fuel Level Sensor “A” Circuit Range/Performance
P014800	Fuel Delivery Error
P102F00	Torque limitation due to fuel pressure
P310B00	Fuel low pressure regulation. Fuel pressure outside specification

Diagnosis / Trigger Conditions

The root cause of the Audi A6 fuel gauge implausible condition is the fuel gauge sender becoming caught on internal lines within the main chamber of the fuel tank. This mechanical interference prevents the sender from accurately reporting the fuel level, leading to incorrect readings displayed on the instrument cluster.

Important Warnings

During the repair procedure, it is critical to follow specific instructions to prevent further issues:

• DO NOT bundle the blue line into the cable tie with the suction jet pump supply and vent lines. This instruction is highlighted in the TSB to ensure proper function and avoid recurrence of the problem.

Repair Procedure Summary

The repair, as outlined in TSB 2063377/1, involves a simple but precise adjustment within the fuel tank:

1. The fuel pump flange is removed, and the inside of the fuel tank is inspected for fuel. If no fuel is present, the procedure continues.
2. A fuel-resistant cable tie is installed around the suction jet pump supply (green) and vent (red) lines inside the fuel tank. This cable tie must ensure a gap of no more than 5mm between these two internal lines (as shown in Figure 2 of the TSB).
3. The tail of the cable tie is carefully removed to prevent it from dropping into the fuel tank.

This adjustment secures the fuel gauge sender, preventing it from getting caught and ensuring accurate fuel level readings.

Required Parts and Tools

For this repair, technicians will typically require the following:

• Fuel Resistant Cable Tie: One (Shop Supply)
• Fuel flange seal: One (See ETKA for part number)
• Fasteners, Bolts, Nuts, and Screws: As needed per the Repair Manual (See ETKA/ELSA)

Warranty Information

This repair is covered under Audi's warranty program. For vehicles within the 48 Months/50,000 Miles new vehicle limited warranty, the repair will be performed free of charge. For Certified Pre-Owned (CPO) vehicles, the claim type is G10, requiring verification of owner eligibility. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only.

• Service Number: 2015
• Damage Code: 0010
• Labor Operations: Electric fuel pump removed + reinstalled (2066 1900), Install Cable Tie (2066 5999), Diagnostic Time (0150 0000), Road test after service procedure (0121 0004).

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Source: NHTSA ID: 10214456