2025-2026 Audi A5/S5/Q5/SQ5 P-Lock & Engine Warning TSB

Owners of 2025-2026 Audi A5, S5, Q5, and SQ5 models may encounter a concerning issue where the transmission's parking lock (P) cannot be selected, potentially preventing the vehicle from being securely locked. This problem is frequently accompanied by a yellow engine warning lamp illuminating on the instrument cluster, displaying a "Drive system: fault" message. Audi has issued Technical Service Bulletin (TSB) 2080044/3 to provide a comprehensive solution for this specific condition.

This TSB, identified as 2080044/3, outlines the diagnostic steps and the necessary repair procedure, primarily involving a software update. The underlying cause is often linked to specific diagnostic trouble codes (DTCs) that indicate a malfunction within the parking lock system. Addressing this issue promptly is crucial for vehicle safety and functionality.

Symptoms of the Parking Lock and Engine Warning Issue

Owners typically first notice this problem through clear indicators in the vehicle's instrument cluster or a direct inability to engage the parking gear. The primary symptoms include:

• Inability to select transmission position P (parking lock): This means the vehicle cannot be properly secured, posing a safety risk as it may not be able to be locked.
• Yellow warning lamp illumination: The instrument cluster displays a yellow engine warning light.
• Verbatim warning message: The instrument cluster may show the explicit message: "Drive system: fault".
• Critical safety warning: In some cases, the instrument cluster will display a more urgent message: "P cannot be selected. Vehicle may roll away! Please contact workshop". This message highlights the severe safety implications of the fault.

These symptoms indicate a malfunction that requires immediate attention from an authorized Audi service center to ensure the vehicle's safe operation and proper parking functionality.

Associated Diagnostic Trouble Codes (DTCs)

When diagnosing the issue of the Audi A5 P-Lock DTC P288B00 or the inability to select the parking position, technicians may find specific diagnostic trouble codes (DTCs) logged in the main control unit for the drive system and running gear systems (diagnostic address 812C). These codes pinpoint the nature of the electronic fault:

DTC Code	Description	Symptom Code
P1D4700	"Parking lock Time exceeded for display"	262145
P288B00	"Park Lock/Pawl Actuator Circuit Performance"	401414

These DTCs provide critical information for technicians to accurately diagnose the problem and confirm that the vehicle's symptoms align with the conditions described in TSB 2080044/3.

What Audi Dealers Will Do

To resolve the parking lock and engine warning light issues, Audi dealerships will perform a software update. This update is detailed in a separate Technical Service Bulletin, TSB 2079690, titled "00 Combined software update 03.10.00/C (28.13.01) KD2." This TSB 2080044/3 specifically supersedes PSS TSB 2078844, indicating a revised or updated procedure for addressing this concern.

The repair process involves several key steps after the software update is completed:

1. Ignition Cycle: The technician will switch off the ignition and wait for the instrument cluster and the transmission position display on the selector lever to turn off completely. This ensures a proper system reset.
2. System Initialization: A waiting period of three minutes is required without operating the vehicle, such as opening doors or using the MMI. This allows the vehicle's control modules to enter a bus sleep cycle and properly initialize.
3. Transmission Calibration Drive: The vehicle must be started in combustion mode. The technician will then drive forward approximately 20 inches in transmission position S, followed by reversing approximately 20 inches in transmission position R. This specific maneuver helps to calibrate the transmission and engage/disengage the parking pawl mechanism.
4. Parking Lock Engagement: Finally, the P button on the selector lever will be pressed to confirm that the parking lock can now be successfully engaged.

This precise sequence of actions ensures the new software is correctly integrated and the parking lock system functions as intended, resolving the Audi A5 P-Lock DTC P288B00 and related symptoms.

Important Information for Owners

Audi has provided specific guidance for owners regarding this issue and the repair process:

• Electronic Parking Brake (EPB) Functionality: Owners should be informed that the electronic parking brake (EPB) will continue to function normally and can be used to park the vehicle, even if the transmission's P position cannot be selected. This provides a temporary safety measure until the repair is completed.
• Warranty Coverage: If your vehicle is outside of its warranty period, this Technical Service Bulletin is considered informational only. This means the repair costs may not be covered by Audi.
• Reproducing the Complaint: It is important for the customer complaint to be clearly reproducible and assigned to this TSB. The repair should only be carried out if all specified criteria (model, chassis number, software version, etc.) are met. Otherwise, the solution may not resolve the problem, and warranty claims could be rejected.

Warranty Information

For vehicles covered under warranty, specific codes are used for claiming the repair related to TSB 2080044/3:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 3410
• Damage Code: KD02

Labor Operations:

Labor Operation	Description	Time Units (TU)
0151 0010	Software update, including connecting battery charger	See SRT with associated operations
0151 0040	Fixed rate for software update, including all required preliminary and follow-up work (including bus sleep cycle, calibration drives, and additional work)	130 TU
0150 9999	In the case of additional attempts, an additional lump sum of 50 time units is possible per flash	50 TU
3410 0199	Check gear lever housing (per each documented attempt)	10 TU

When performing the combined software update, time stamps are not required for billing under warranty. This allows for flexibility in the workshop, and the update can even be performed by non-productive personnel.

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Source: NHTSA ID: 11028473