2019-2021 Audi Q7/Q8 MIL On DTC P148D00 P044200 TSB

Symptoms of the Audi Q7/Q8 MIL On DTC P148D00 P044200

Owners of 2019-2021 Audi Q7, Q8, SQ7, SQ8, and RS Q8 models may notice the Malfunction Indicator Lamp (MIL), commonly known as the check engine light, illuminated on their dashboard. This warning light often appears in conjunction with specific diagnostic trouble codes (DTCs).

When diagnosing the issue, technicians may find DTC P148D00, described as "Evaporative Emission System Leak Detection Pump implausible frequency," and/or DTC P044200, which indicates "EVAP Emission Control System (Small Leak) Leak Detected," stored in the Engine Control Module (ECM J623).

Diagnosing the Evaporative Emission System Fault

Audi Technical Service Bulletin (TSB) 2073032/2 highlights that these specific DTCs, P148D00 and P044200, can be stored in the ECM J623 due to a software issue, even if there are no actual leaks in the fuel tank system. For this TSB to apply, it is crucial that no other unrelated DTCs are logged in the system, indicating a software-specific problem rather than a broader mechanical failure.

Fault Codes (DTCs)

The following diagnostic trouble codes are associated with this issue:

Code	Description	Module
P148D00 (P148D)	"Evaporative Emission System Leak Detection Pump implausible frequency"	ECM J623
P044200 (P0442)	"EVAP Emission Control System (Small Leak) Leak Detected"	ECM J623

The Audi TSB 2073032/2 Repair Process

This issue stems from a software problem within the ECM J623 (address word 0001). The solution, as outlined in TSB 2073032/2, involves updating the software of this control module. This bulletin supersedes Technical Service Bulletin Group 20 number 24-67 dated March 8, 2024.

The repair procedure requires technicians to follow all instructions detailed in TSB 2011732, which covers Software Version Management (SVM) operating instructions. The ECM J623 is then updated using the specific SVM action code 01A255. After the software update, it is essential to confirm that there are no actual leaks present in the fuel system.

Required Software and Tools

To perform the software update for the Audi Q7/Q8 MIL On DTC P148D00 P044200, technicians will utilize SVM action code 01A255. This code facilitates the update of the ECM J623 to the latest software version. The process involves using Diagnostic over Internet Protocol (DoIP) for flashing the control module. Technicians should ensure DoIP is active by checking for a red LED on the VAS 6154(A) diagnostic tool.

The updated software part numbers for affected models are as follows:

• Q7: Old 4M0907559D (<0003) to New 4M0907559D (0004)
• Q7: Old 4M0907559L (<0002) to New 4M0907559L (0003)
• Q8: Old 4M8907557F (<0001) to New 4M8907557F (0002)
• Q8: Old 4M8907559M (<0002) to New 4M8907559M (0003)

Warranty Information

Warranty claims for this software update are covered under Claim Type 110 for up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, the claim type is G10, requiring verification of owner eligibility. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Important Warnings

Owners should be aware that if their vehicle is outside of its warranty period, this Technical Service Bulletin 2073032/2 is provided for informational purposes only. The repair may not be covered by Audi if the warranty has expired.

NHTSA ID: 11002219