2021-2022 Audi Q7/Q8 Bank 2 Engine Misfire TSB

Audi has issued Technical Service Bulletin PSS 01 3.0TFSI (01 23 64 2054182/7) to address instances of Bank 2 engine misfires in certain 2021-2022 Audi Q7 and 2021 Audi Q8 models equipped with the DCBD engine. This bulletin, which supersedes Group 01 number 23-47 dated March 9, 2023, identifies a software calibration issue as the root cause of the problem.

This issue primarily occurs when operating the vehicle with winter blend fuel, which has a higher vapor pressure. Owners may notice symptoms such as the Malfunction Indicator Lamp (MIL) illuminating or flashing, or a general report of engine misfires.

Symptoms

Owners of affected Audi Q7 or Q8 vehicles may observe the following conditions related to an Audi Q8 engine misfire:

• The Malfunction Indicator Lamp (MIL) is illuminated or flashing.
• The customer reports engine misfires.
• Misfire Diagnostic Trouble Codes (DTCs) are stored for more than one cylinder on Bank 2 of the engine.
• DTC ambient conditions indicate misfires occurring at or near the same timestamp.
• Misfires are detected while the engine is operating at "Leerlauf" (idle).
• DTC ambient conditions show misfires when the vehicle speed is at or near 0 km/h.

It is important to note that this PSS only applies if the vehicle is not currently misfiring when examined in the workshop. If these specific criteria are not met, the vehicle should be diagnosed using the standard GFF process.

Fault Codes / DTCs

While the TSB provides examples, the issue is characterized by misfire DTCs on Bank 2. Examples of such codes include:

• P030500: Cyl.5 Misfire Detected
• P030600: Cyl.6 Misfire Detected

These codes indicate specific cylinder misfires within Bank 2 of the engine.

Technical Background

The underlying cause of the Audi Q8 engine misfire is a software calibration issue. This calibration problem leads to engine misfires under specific running conditions, particularly when using winter blend fuel, which has a higher vapor pressure. The condition is more prevalent during colder, winter months.

Audi is currently developing an improved software solution to address this issue. This production solution is anticipated to be released in the third quarter of 2023, though this timeline is subject to change.

Important Warnings

Owners and technicians should be aware of a critical advisory from Audi regarding this condition:

• "Do not replace any components for this condition since this will not resolve the customer's concern."

This means that replacing parts like spark plugs, ignition coils, or fuel injectors will not fix the underlying software problem and should not be performed.

Repair Procedure Summary

For vehicles exhibiting the symptoms and meeting the conditions outlined in Technical Service Bulletin PSS 01 3.0TFSI, the service procedure is as follows:

1. If the vehicle's condition matches the criteria in the PSS TSB, clear any stored Diagnostic Trouble Codes (DTCs).
2. Perform a test drive to confirm that no faults return after clearing the codes.
3. If no faults reappear, inform the customer that a permanent solution, in the form of updated software, is forthcoming in the third quarter of 2023. Emphasize that no physical repairs are necessary at this time, and no components should be replaced as this will not resolve the issue.
4. Create a PSS record in the PSS application via the Pending Service Solutions (PSS) link in Access Audi.

Owner Action

If your 2021-2022 Audi Q7 or 2021 Audi Q8 is experiencing an Audi Q8 engine misfire with the MIL light on or flashing, and especially if these symptoms occur at idle or low speeds, it is recommended to visit an authorized Audi dealership. The dealership will be able to confirm if your vehicle's symptoms align with this Technical Service Bulletin PSS 01 3.0TFSI (01 23 64 2054182/7).

At this time, no physical parts replacement is necessary or recommended. The fix will involve a software update once it becomes available. The TSB is for informational purposes and is not applicable to any Audi Warranty.

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Source: NHTSA ID: 10240143