2025 Audi A5/Q5 Gearbox Functional Issue TSB 2078831/1

Audi has issued Technical Service Bulletin (TSB) 2078831/1 to address a functional issue within the gearbox of certain 2025 Audi A5, S5, Q5, and SQ5 models. This bulletin provides guidance for technicians on diagnosing and rectifying problems that can lead to various symptoms, including difficulty engaging the parking lock and specific warning messages appearing in the instrument cluster or driver information system. Owners experiencing a 2025 Audi A5 gearbox functional issue should be aware of the potential causes and the recommended repair procedures.

This TSB specifically targets vehicles equipped with DL382 and DL552 transmissions, which are integral to the vehicle's powertrain. The issues described can impact the safe and proper operation of the transmission, making it crucial for owners to understand the symptoms and the necessary steps for resolution.

Symptoms Owners May Experience

Owners of affected 2025 Audi A5, S5, Q5, or SQ5 vehicles may observe several distinct symptoms related to the gearbox functional issue. These symptoms often indicate a problem with the transmission's ability to engage the parking lock or a general malfunction requiring attention.

One primary concern is the inability to select transmission position 'P' (parking lock). When this occurs, the vehicle cannot be properly secured, which can pose a safety risk. This condition is often accompanied by a prominent warning message on the dashboard.

Another common indicator is the illumination of the gearbox warning lamp in the instrument cluster. This lamp serves as a general alert that a fault has been detected within the transmission system, prompting the driver to seek service.

Furthermore, drivers may encounter specific warning messages displayed in the instrument cluster or the driver information system (DIS, MFI, MMI). These verbatim messages are critical for identifying the issue:

• "P cannot be selected. Vehicle may roll away! Please contact workshop": This urgent message directly warns the driver of a critical safety concern related to the parking lock and advises immediate professional assistance.
• "message: drive malfunction please service vehicle": This general malfunction message indicates a broader issue within the drive system, which can include the gearbox.

These symptoms, particularly the inability to select 'P' and the associated warning, highlight the importance of addressing the 2025 Audi A5 gearbox functional issue promptly to ensure vehicle safety and operational integrity.

Diagnostic Trouble Codes (DTCs)

When a gearbox functional issue occurs, the vehicle's transmission control module (-J217-, address word 0002) typically logs specific Diagnostic Trouble Codes (DTCs). These codes help technicians pinpoint the exact nature of the fault. TSB 2078831/1 identifies several key DTCs associated with this problem:

• P187C00: Gear actuator 3 Engaging process not successful: This is a primary DTC, indicating a failure in the third gear actuator's ability to engage properly. This code can be logged as either static (persistent) or intermittent, suggesting varying degrees of the fault. The symptom code associated with this is 20828.

Other DTCs that may also be logged in conjunction with or as a result of the primary issue include:

• P270800: Solenoid Valve 6 is sticking on: This code points to a malfunction with solenoid valve 6, which plays a crucial role in transmission fluid flow and gear engagement. A sticking solenoid can disrupt the precise hydraulic control required for smooth gear changes. The symptom code for this is 20859.
• P086900: Transmission Oil Pressure Too High: This DTC indicates an issue with the transmission's hydraulic system, specifically an excessively high oil pressure. Incorrect oil pressure can lead to shifting problems, component wear, and overall transmission malfunction. The symptom code associated with this is 43034.

The presence of any of these DTCs, especially P187C00, confirms the presence of a 2025 Audi A5 gearbox functional issue and guides the technician toward the appropriate diagnostic and repair steps.

Diagnosis and Trigger Conditions

Diagnosing the 2025 Audi A5 gearbox functional issue involves a combination of observing customer-reported symptoms and analyzing the DTCs stored in the transmission control module. Technicians will typically begin by verifying the customer's complaint, such as the inability to select 'P' or the appearance of specific warning messages.

Upon connecting a diagnostic tool, the presence of DTC P187C00, P086900, or P270800 in the transmission control module (-J217-, address word 0002) confirms the fault. The TSB specifies that if P187C00 is logged as active/static, a particular set of initial steps is required. If P187C00 is logged as active/static or passive/sporadic, Guided Fault Finding is the next step.

Guided Fault Finding is a systematic diagnostic process integrated into Audi's workshop software. It leads technicians through a series of tests and checks to identify the root cause of a fault code. This process ensures that all potential contributing factors are considered before proceeding with a repair. For example, if P086900 or P270800 are logged, Guided Fault Finding is used to address those specific entries.

Repair Procedure Summary

The repair procedure for the 2025 Audi A5 gearbox functional issue varies slightly depending on the specific DTCs present and their status (active/static or passive/sporadic). The TSB outlines distinct steps to address the problem effectively.

Initial Steps for Active/Static DTC P187C00

If DTC P187C00 is logged as active or static, the following sequence of actions is required:

1. Ignition Cycle: The technician must switch off the ignition. It is crucial to wait until the transmission position display in the instrument cluster and on the selector lever goes out completely. This ensures the transmission control module fully resets.
2. Waiting Period: After turning off the ignition, a minimum waiting period of three minutes is necessary. During this time, the vehicle should not be operated; this includes not opening any doors or interacting with the MMI system. This allows internal system processes to complete.
3. Drive Cycle: The vehicle must then be started in combustion mode. The technician will drive the vehicle forward approximately 20 inches in transmission position 'S' (Sport) and then reverse approximately 20 inches in transmission position 'R' (Reverse). This sequence can also be performed in the opposite order. This maneuver helps to cycle the transmission components and potentially clear a mechanical hang-up.
4. Parking Lock Engagement: Finally, the 'P' button on the selector lever must be pressed to attempt engagement of the parking lock.

General Repair for DTC P187C00

Regardless of whether DTC P187C00 is active/static or passive/sporadic, the primary repair involves utilizing Guided Fault Finding to resolve the issue. This comprehensive diagnostic process helps identify the underlying cause of the gear actuator malfunction.

Improving Shift Quality (If Guided Fault Finding is Inconclusive)

If Guided Fault Finding does not determine a clear cause for the fault, or if the objective is to improve overall shift quality, a specific calibration routine is performed:

1. Calibration Selection: The technician will navigate through the diagnostic system to select: Guided Function -> 0002 - Analysis functions transmission -> 2- Calibration of Gear Position Distance Sensors -G487- to -G490- as a control measurement. This function is designed to recalibrate the sensors that monitor gear positions.
2. Repetitive Calibration: The calibration of the gear position distance sensors must be successfully repeated a total of 10 times. This repetitive process ensures the sensors are accurately aligned, leading to improved shift quality and potentially resolving intermittent engagement issues.

Additionally, if DTCs P086900 or P270800 are logged in the event memory, technicians are instructed to use Guided Fault Finding to work through those specific entries, ensuring all related issues are addressed.

Important Warnings and Owner Information

Audi's TSB 2078831/1 includes several critical pieces of information for both technicians and vehicle owners. These warnings and advisories ensure proper handling of the issue and manage customer expectations.

Firstly, for vehicles still within the new model launch repair authorization period, workshops are advised to create a case with the Technical Assistance Center (TAC) for repair authorization. This ensures that new model issues are tracked and managed appropriately, with the TSB number referenced in the TAC case.

Owners should also be informed that the electronic parking brake (EPB) will continue to function normally and can be used to park the vehicle, even if the primary parking lock mechanism is experiencing issues. This provides a crucial safety backup.

Technicians are also reminded to read out all transmission measured values from address word 0002 and upload them to GFF paperless. This data collection is vital for comprehensive diagnosis and for Audi's ongoing analysis of vehicle performance and issues.

Warranty Information

This Technical Service Bulletin provides specific details regarding warranty claims for the 2025 Audi A5 gearbox functional issue. It's important for owners to understand how these claims are processed.

• Claim Type: The TSB states that if the vehicle is outside of any warranty, this Technical Service Bulletin is for informational purposes only. This means that repairs for out-of-warranty vehicles may not be covered by Audi and could incur costs for the owner.
• Service Number: The designated service number for this procedure is 3410.
• Damage Code: The damage code associated with this issue is 0010.
• Labor Operations: Specific labor operations are provided for warranty claims:
  • 0150 0010: GFF / Guided Functions (referencing SRT for associated operations).
  • 0150 0060: GFF / Guided Functions (time stated on the diagnostic protocol).
  • 3410 0599: Check and adjust gear lever housing (referencing SRT for associated operations).
• Claim Comment: All warranty claims related to this TSB should include the comment "As per TSB 2078831/1" to ensure proper processing.

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty. Owners should consult their Audi dealer to confirm warranty coverage for any repairs related to this 2025 Audi A5 gearbox functional issue.

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Source: NHTSA ID: 11022700