2021-2022 Audi A6 / A7 Engine Misfires DTCs P0300-P0306

Audi has released Technical Service Bulletin (TSB) 2058038/4 to address instances of engine misfires and an illuminated Malfunction Indicator Lamp (MIL) in certain 2021-2022 Audi A6, A6 allroad, and A7 models. This condition is often accompanied by diagnostic trouble codes (DTCs) ranging from P0300 to P0306. The TSB highlights that a software calibration issue is the root cause of these engine misfires, often leading to an "Audi A6 engine misfires P0300" type of diagnostic scenario.

Symptoms

Owners of affected vehicles may notice their Malfunction Indicator Lamp (MIL) illuminated on the dashboard. This warning light signals that the engine control unit has detected a fault. The primary symptom is the occurrence of engine misfires, which can sometimes be felt as rough idling or hesitation during acceleration.

Fault Codes / DTCs

When scanned, the vehicle's diagnostic system may store one or more of the following Diagnostic Trouble Codes (DTCs) related to engine misfires:

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 that the engine control unit has detected a misfire in one or more cylinders, or a random misfire condition.

Technical Background

According to Audi's technical background for TSB 2058038/4, the engine misfires are attributed to a software calibration issue. This specific calibration can lead to misfires under certain running conditions, especially when the vehicle is operating with winter blend fuel. Winter blend fuels typically have a higher vapor pressure, which, combined with the software calibration, can trigger the misfire detection system. This issue is more prevalent during colder, winter months.

Important Warnings

Audi has issued crucial advisories regarding this specific condition:

• Do not replace components: Technicians are instructed not to replace any engine components, such as spark plugs or ignition coils, for this misfire condition. Replacing parts will not resolve the underlying software calibration issue.
• Warranty Coverage: This Technical Service Bulletin is for informational purposes only and is not applicable to any Audi warranty. Owners should be aware that this TSB does not guarantee warranty coverage for diagnosis or future repairs related to this specific issue.

What Owners Should Do

If your 2021-2022 Audi A6, A6 allroad, or A7 is experiencing engine misfires and has an illuminated MIL with DTCs like P0300, it's important to understand the current situation. Audi is developing an improved software solution for this issue, which is expected to be available by the end of the second quarter of 2023. At this time, no immediate repairs are necessary or recommended by the manufacturer.

Owners are advised to inform their Audi service center about the issue. The dealership will create a PSS (Pending Service Solutions) record in their system. This helps Audi track the prevalence of the problem and ensures that owners are notified once the permanent software solution is released. Do not authorize any component replacements for this specific misfire condition, as it will not resolve the problem.

TSB History and Related Information

This Technical Service Bulletin, 01 23 36 2058038/4, is a revision 4 of an earlier bulletin. It supersedes Technical Service Bulletin Group 01 number 21-02, which was dated April 7, 2021. The revisions primarily involved updating the production solution estimates and adjusting service steps. For 2019 model year A6 and A7 vehicles, a related issue is addressed under TSB 2069038/2, which may provide additional context for technicians.

Source: NHTSA ID: 10230581