2021 Audi MIL On with Cylinder Misfire DTCs P0300-P0306

Audi has issued Technical Service Bulletin (TSB) 01 23 80 2069038/4 to address a condition where the Malfunction Indicator Lamp (MIL) illuminates due to cylinder misfires. This issue can affect various Audi models from 2019-2021, including the Q8, A6, A7, Q7, and A6 allroad. The TSB provides instructions for updating the engine control module (ECM) software to resolve the underlying cause of the misfires and prevent the MIL from coming on.

This TSB, dated October 2, 2023, supersedes an earlier bulletin, Group 01 number 23-61, which was dated July 17, 2023. It also replaces Pending Service Solution (PSS) TSB 2054182, which addressed PSS 01 3.0 TFSI Bank 2 engine misfires in Q8/Q7 (DCBD engine).

Revision History

This Technical Service Bulletin has undergone several revisions to improve its accuracy and scope:

• Revision 4 (October 2, 2023): Updated models in the header and revised warranty claim types.
• Revision 3 (July 17, 2023): Revised models in the header and added specific service instructions for the Q8.
• Revision 2 (January 6, 2023): Revised the header to update the filter criteria.

Symptoms

Owners may notice the following symptoms indicating a potential issue:

• The Malfunction Indicator Lamp (MIL) is illuminated on the dashboard.
• The vehicle may experience cylinder misfires.

Fault Codes / DTCs

When scanned, the vehicle's diagnostic system may store one or more of the following Diagnostic Trouble Codes (DTCs) in the engine control module (J623):

Code	Description
P0300	Random/Multiple Cylinder Misfire Detected
P0301	Cyl.1 Misfire Detected
P0302	Cyl.2 Misfire Detected
P0303	Cyl.3 Misfire Detected
P0304	Cyl.4 Misfire Detected
P0305	Cyl.5 Misfire Detected
P0306	Cyl.6 Misfire Detected

These codes specifically indicate a problem with engine combustion, leading to the 2021 Audi Q8 cylinder misfire P0300 and related issues.

Diagnosis / Trigger Conditions

The root cause of the cylinder misfires and the illuminated MIL is identified as an issue that can be corrected with a software update. The optimized software is designed to prevent misfires and ensure the MIL remains off. This update targets the control module -J623- (address word 0001), which is the engine control module (ECM).

Repair Procedure Summary

The repair for the 2021 Audi Q8 cylinder misfire P0300 and other related DTCs involves updating the ECM software. Technicians will follow instructions outlined in TSB 2011732, "00 Software Version Management (SVM), operating instructions." The process involves updating the ECM, J623 (address word 0001), using the SVM action code 01A255. The specific target data container numbers and versions vary by model year and vehicle type:

Model	Old Target Data Container Number	Old Target Data Container Version	New Target Data Container Number	New Target Data Container Version
MY19 A6/A7	4K0907559A	0007	4K0907559A	0008
MY21 A6/A7	4K0907559K	0001-0002	4K0907559K	0004
MY20 Q7	4M0907559D	0001-0003	4M0907559D	0004
MY21 Q7	4M0907559L	0001-0002	4M0907559L	0003
MY21 Q8	4M8907559M	0001-0002	4M8907559M	0003
MY19-20 Q8	4M8907559A	0001-0003	4M8907559A	0004

Required Tools and Warranty Information

To perform this software update, technicians require a VAS tester, specifically models VAS 6160 or VAS 6150, running the current version of ODIS (Windows 10).

For warranty claims related to TSB 01 23 80 2069038/4, the service number is 2470 and the damage code is 0039. The labor operation for the software update, which includes checking for DTCs, is 0151 0000, with a maximum time allowance of 50 time units (TU). Diagnostic Guided Fault Finding (GFF) has a labor operation of 0150 0000, with a maximum of 15 TU. Road tests before and after the service procedure have no allowance (0 TU).

This repair is covered under warranty for up to 48 months or 50,000 miles (Claim Type 110). For Certified Pre-Owned (CPO) vehicles, coverage falls under Claim Type G10, requiring owner verification.

Important Note for Out-of-Warranty Vehicles

If your vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only. In such cases, charges may apply for the diagnosis and software update procedure.

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Source: NHTSA ID 10246714