2023-2026 Audi Models Fuel Cap Seal Leak TSB (P045600)

Symptoms

Owners of affected Audi vehicles may notice the 'Check Engine' light or exhaust emission warning light illuminating on the dashboard. This indicates a potential issue within the vehicle's emission control system.

Fault Codes / DTCs

When a 'Check Engine' light appears due to an Audi fuel cap seal leak, the Engine Control Module (ECM J623) may store specific diagnostic trouble codes (DTCs). These codes point to an EVAP system leak.

Diagnosis

If your Audi's 'Check Engine' light is on, a technician will typically scan the vehicle for stored DTCs. The presence of P045600, P00EF00, or P044200 strongly suggests an issue with the fuel tank detection system, often related to the fuel cap seal.

Repair Procedure Summary

The repair for an Audi fuel cap seal leak is straightforward and does not typically require replacing components or conducting a smoke test. The primary step involves inspecting the fuel tank cap for a twisted seal.

If the seal is found to be twisted, the technician will correctly reposition it. This simple adjustment is often sufficient to resolve the EVAP system leak and clear the associated fault codes.

Owner Action

If your 2023-2026 Audi displays a 'Check Engine' light, especially with the symptoms or DTCs mentioned, it is recommended to visit an authorized Audi service center. Inform them about the illuminated warning light and any specific fault codes you may have observed.

The repair, which involves modifying the fuel cap seal, is a quick procedure. If your vehicle is still under warranty, this service may be covered. The labor operation for this fix is identified as 'Modify Seal Cap' (2005 4999) with a damage code of 0050.

Source: NHTSA ID 11025354