2022-2024 Audi Q5 e, A7 e Drive System Fault P0A4000

Owners of certain 2022-2024 Audi Q5 e and A7 e plug-in hybrid electric vehicles (PHEV) may experience a "drive system fault" message in their instrument cluster or find that their vehicle cannot be started. Audi has released Technical Service Bulletin (TSB) 2074662/1 to provide diagnostic and repair procedures for this specific condition, which is often accompanied by diagnostic trouble code (DTC) P0A4000. This TSB, dated July 31, 2024, is crucial for resolving the Audi Q5 e drive system fault P0A4000.

Symptoms

Owners typically report one or both of the following issues:

• "A drive system fault is displayed in the instrument cluster."
• "The vehicle cannot be started."

These symptoms point to a deviation from normal operating conditions within the vehicle's drive system.

Fault Codes / DTCs

When diagnosing the issue, technicians will likely find the following event memory entry logged in the electric drive control unit J841 (diagnostic address 0051):

• P0A4000: Drive Motor "A" Position Sensor Circuit Range/Performance Implausible signal symptom 50954.

This specific DTC confirms the presence of an Audi Q5 e drive system fault P0A4000 related to the rotor position sensor.

Diagnosis / Trigger Conditions

The TSB indicates that the fault originates from an implausible signal symptom 50954 detected by the electric drive control unit J841. This suggests a problem with the drive motor's position sensor, which is critical for the proper operation of the hybrid drive system. The TSB advises technicians to reproduce the customer complaint to ensure accurate assignment to this bulletin.

Repair Procedure Summary

The repair procedure outlined in TSB 2074662/1 involves several steps, depending on the vehicle model:

1. For A7 TFSIe models only: Technicians must first verify if TSB 2066596 has been performed. If not, TSB 2066596 must be completed before proceeding with this bulletin.
2. If TSB 2066596 is already completed or for Q5 e models: If no other causes for the drive system fault can be detected, the primary repair involves replacing the drive motor rotor position sender 1 G713 (also known as the rotor position sensor) according to the Workshop Manual.

This replacement is a critical step in addressing the Audi Q5 e drive system fault P0A4000.

Required Tools or Parts

To perform this repair, technicians will need:

• Rotor position sender 1: Quantity 01.
• Fasteners, Bolts, Nuts, and Screws: As needed per the Repair Manual.

Specific part numbers for these items can be found in ETKA/ELSA, Audi's electronic parts catalog and service information system.

Important Warnings

Audi emphasizes the importance of careful installation for the rotor position sensor:

• "Please work with great care when installing the rotor position sensor so that the sensitive wires on the gearbox housing are positioned correctly."

This warning highlights the delicate nature of the component and the potential for improper installation to cause further issues. Additionally, the TSB states that the repair should only be carried out if all criteria (model, VIN, engine/motor, gearbox code, etc.) apply exactly, otherwise, the solution will not eliminate the problem.

Warranty Information

Warranty claims for this repair are processed under Service Number 9344 and Damage Code 0040. The labor operation for removing and installing the rotor position sensor is 9344 1950. Diagnostic time is listed as 0150 0060. Road tests before and after the service procedure are allocated 0 TU (time unit) and 10 TU, respectively. All claims must adhere to the Audi Warranty Policies and Procedures Manual, and are subject to review by Audi Warranty.

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Source: NHTSA ID: 11005941