2025 Audi A3 Check Engine Light DTCs P05A300 P05A000

Audi has issued an internal communication, TSB 2066297, titled "Audi On-car analysis list from March 11, 2025." This document provides guidance for technicians regarding specific diagnostic scenarios involving the check engine light on certain 2024-2025 Audi Q5 PHEV and 2025 Audi A3 models. It emphasizes the importance of contacting the Audi Helpline and Technical Assistance Center (TAC) for further direction before attempting repairs.

This TSB, also referred to by its program names V4P and vin4pin, serves as an informational bulletin to help dealerships address recurring issues efficiently. It highlights known conditions that trigger a check engine light and directs technicians to specialized support for complex diagnostics.

Identified Issues and Diagnostic Guidance

The TSB outlines two primary scenarios leading to a check engine light, affecting different models:

• 2024-2025 Audi Q5 PHEV (Plug-in Hybrid Electric Vehicle): Owners of these models might experience a "Check engine light after charging." Technicians are instructed to verify the customer's concern and check for the Diagnostic Trouble Code (DTC) P0E5E00, which specifically relates to the BATTERY CHARGER CONTROL MODULE PROCESSOR PERFORMANCE. If this DTC is stored in the 008C module, technicians must contact the Technical Assistance Center (TAC) for further guidance.

• 2025 Audi A3: For the 2025 Audi A3, a general "Check engine light" illumination is the reported topic. In this case, technicians should look for DTCs P05A300, P05A000, and/or U058500. The TSB notes that a possible on-site analysis might be required, and technicians are again directed to contact TAC for further direction. If your 2025 Audi A3 check engine light is on, this TSB applies.

Important Instructions for Technicians

The document explicitly states: "Please contact Audi Helpline before attempting repair." This underscores the complexity of these issues and the need for expert guidance. For both scenarios, the instruction "Contact TAC for further direction" is given, indicating that standard diagnostic procedures may not be sufficient and specialized support is required to properly address the root cause of the check engine light.

What This Means for Owners

If you own a 2024-2025 Audi Q5 PHEV and your "Check engine light after charging" illuminates, or if your 2025 Audi A3 check engine light comes on, it is crucial to schedule an appointment with an authorized Audi dealership. This TSB indicates that these are known issues requiring specific diagnostic and repair protocols that involve direct consultation with Audi's technical support. Do not attempt to diagnose or repair these issues yourself, as specialized tools and knowledge, along with guidance from Audi's Technical Assistance Center, are necessary. The dealership will follow the instructions in TSB 2066297 to properly evaluate your vehicle and address the underlying cause of the check engine light.

Fault Codes / DTCs

The following Diagnostic Trouble Codes (DTCs) are referenced in this communication:

• P0E5E00: Related to Battery Charger Control Module Processor Performance.
• P05A300: A general powertrain-related code.
• P05A000: Another general powertrain-related code.
• U058500: A network communication or module-related code.

These codes are critical indicators for technicians to follow the specific diagnostic paths outlined by Audi.

Source: NHTSA ID: 11030977, Manufacturer Communication TSB 2066297