2025 Audi A5/Q5/S5/SQ5 MIL On, DTC P050600

Audi has issued a Pending Service Solution (PSS) 2078915/1 concerning a specific engine issue affecting certain 2025 Audi A5, Q5, S5, and SQ5 models equipped with the EA839evo V6 TFSI engine. This communication addresses instances where the "MIL on" (Malfunction Indicator Lamp) light illuminates, accompanied by the diagnostic trouble code (DTC) P050600.

The issue stems from a software deviation within the engine control unit (ECM J623) and the HCP1 module. While a permanent solution is still under development, Audi is actively reviewing the matter and providing interim guidance to dealerships.

Symptoms You Might Notice

Owners of affected vehicles may observe one or both of the following conditions:

• The "MIL/exhaust warning lamp is on" in the instrument cluster after starting the engine. This is commonly known as the Check Engine Light.
• The engine speed may be noticeably low in isolated cases, though this is not always present.

Understanding DTC P050600

The primary diagnostic trouble code associated with this issue is P050600. This code specifically refers to "Idle Speed Control, RPM below spec value." It indicates that the engine's idle speed is not within the expected range. The symptom code 4008, indicating a static or intermittent fault, may also be stored.

Technical Background of the Issue

Audi has identified that the root cause of the Audi P050600 MIL on issue is a software deviation. This deviation affects the engine control unit (ECM J623) and the HCP1 module, leading to the incorrect storage of DTC P050600 in the engine control unit.

What Audi is Doing (Production Solution)

Audi is actively working on a permanent solution for this software deviation. The current bulletin, PSS 2078915/1, is a preliminary communication, and it will be updated once more information and a definitive fix are available. A solution is currently under development.

Important Warnings for Owners

Owners should be aware of specific advisories regarding this condition:

• Do not replace any components for this condition since this will not resolve the customer's concern. This is a critical warning, as replacing parts will not fix the underlying software issue.
• Audi advises that this matter is being reviewed, and customers will be advised if any action is determined to be needed. At this point, no repairs are necessary for this condition.
• The concern generally does not occur during normal vehicle operation. A low battery charge level, which can occur during extended stationary periods (e.g., during transportation or while the vehicle is at the workshop), might contribute to the issue.
• A result regarding a permanent fix is expected by the end of the 4th quarter of 2025, though this timeline is subject to change.

Interim Service Advice for Technicians

For vehicles exhibiting the Audi P050600 MIL on condition, technicians are instructed to:

1. Clear fault P050600 from the engine control unit.
2. Charge the vehicle's battery.
3. Create a PSS record in the Pending Service Solutions (PSS) application via AccessAudi. This helps Audi track the prevalence of the issue.

For vehicles still within the new model launch repair authorization period, workshops must also create a case with the Technical Assistance Center (TAC) and reference PSS 2078915/1 in the TAC case.

Warranty Information

For warranty claims related to this issue, the following codes are provided:

• Service Number: 2470
• Damage Code: 0055
• Labor Operations: GFF / Guided Functions (0150 0060 and 0150 0010).

If the vehicle is outside of warranty, this Technical Service Bulletin is for informational purposes only.

What This Means for You

If your 2025 Audi A5, Q5, S5, or SQ5 displays the "MIL on" light with DTC P050600, it indicates a known software issue that Audi is actively addressing. There is no immediate repair available, and component replacement is not recommended. You should monitor your vehicle and await further communication from Audi regarding a permanent solution. If you experience this Audi P050600 MIL on issue, it is advisable to have your dealership clear the fault and ensure your battery is adequately charged.

Source: NHTSA ID 11022687