2021 Audi V8 TFSI P030000 Misfire & Cylinder Corrosion

Symptoms

Owners of affected 2021 Audi V8 TFSI vehicles may notice several issues related to engine performance. The primary indicator is a 'MIL on' (Malfunction Indicator Lamp) illuminated on the dashboard. Additionally, the engine might 'run erratically or judder,' indicating an inconsistent power delivery or rough operation. Some owners may also report 'an engine oil consumption concern,' suggesting the engine is using more oil than expected.

When technicians examine the vehicle, they may find 'corrosion marks on the cylinder wall' of one or more cylinders. These physical marks are often accompanied by the diagnostic trouble code (DTC) P030000, which signifies 'Random/Multiple Cylinder Misfire detected' and is stored in the Engine Control Module (ECM), specifically J623 (address word 0001).

Fault Codes / DTCs

This Technical Service Bulletin specifically addresses the following diagnostic trouble code:

Diagnosis / Trigger Conditions

The TSB explains that the cylinder walls of the EA825 V8TFSI engine feature an Atmospheric Plasma Spraying (APS) coating. While 'partial, light corrosion observed on the surface of one or several cylinder walls' might be found, this condition does not inherently affect the APS coating or the overall operation of the engine. The presence of these corrosion marks alone is not considered the root cause of the 'MIL on' or other customer concerns, including the 2021 Audi V8 TFSI P030000 misfire.

Figures 1 and 2 in the original document illustrate these corrosion marks, showing them as superficial and not indicative of a deeper structural problem with the cylinder walls or their protective coating. Therefore, the TSB directs technicians to look beyond these marks when diagnosing the underlying cause of the reported symptoms.

Important Warnings

This Technical Service Bulletin 13 20 09 2060876/1 provides crucial guidance for both technicians and owners:

• Engine replacement is not justified: The TSB explicitly states that an engine replacement is not warranted solely due to the presence of these corrosion marks. This prevents unnecessary and costly repairs.
• Not applicable to any Audi Warranty: This TSB is informational. It does not authorize warranty claims for the conditions described, as the corrosion marks themselves are not considered a defect requiring repair.

Repair Procedure Summary

This TSB does not outline a specific repair procedure for the corrosion marks, as they are deemed normal and not the cause of the issue. Instead, it serves as an informational bulletin to prevent misdiagnosis. When a 2021 Audi V8 TFSI presents with a 'MIL on' and DTC P030000, along with engine judders or oil consumption, and corrosion marks are observed on the cylinder walls, technicians are instructed that 'the cause for the MIL or the customer concern needs further diagnosis.' This means the diagnostic process should continue to identify the actual fault causing the misfire or other symptoms, rather than attributing them to the benign cylinder wall corrosion.

Owner Action

If you own a 2021 Audi A6, A7, A8, Q7, Q8, S6, S7, S8, SQ7, SQ8, RS6 Avant, RS7, or RSQ8 with the V8 TFSI engine and are experiencing a 'MIL on' light, engine judders, or increased oil consumption, especially if accompanied by a P030000 fault code, you should schedule an appointment with an authorized Audi service center. Be aware that the presence of cylinder wall corrosion marks, as described in TSB 13 20 09 2060876/1, is considered normal and does not require engine replacement. Your technician will need to perform further diagnostic steps to pinpoint the actual cause of the 2021 Audi V8 TFSI P030000 misfire or other symptoms.

Source: NHTSA ID: 10181765