2021-2023 Audi Gearbox Malfunction DTC P17F900

Audi has issued Technical Service Bulletin (TSB) 2064312/6, superseding TSB 23-47, to address a common issue affecting various 2021-2023 Audi models equipped with the DL382 Transmission. Owners may experience a "Gearbox Malfunction" warning and a loss of drive. This TSB provides diagnostic and repair procedures for technicians to resolve the underlying cause, which is often related to loose bolts on the high-pressure filter cover.

Symptoms

Owners of affected Audi vehicles may observe the following symptoms:

• A warning message stating, "The gearbox malfunction message is on."
• A complete loss of vehicle propulsion, indicated by "The vehicle has no drive."

These symptoms suggest a critical issue within the transmission system that requires immediate attention.

Fault Codes / DTCs

When diagnosing the Audi gearbox malfunction DTC P17F900, technicians will typically find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the Transmission Control Module (TCM), J217 (address word 0002):

Code	Description	Symptom Code	Condition
P17F900	Parking lock Mechanical malfunction	22345	Active/static or passive/intermittent
P074700	Solenoid valve 1 stuck operated	20968	Active/static or passive/intermittent
P077700	Solenoid valve 2 stuck operated	20969	Active/static or passive/intermittent

These fault codes can appear individually or in combination, pointing towards mechanical or solenoid-related issues within the gearbox.

Diagnosis / Trigger Conditions

The root cause identified in the technical background is loose bolts on the cover for the high-pressure filter (pressure filter 2). When a customer reports a "Gearbox Malfunction" warning and the vehicle has no drive, technicians are instructed to perform Guided Fault Finding for the logged DTCs. If the diagnostic process recommends replacing the Parking Lock Solenoid N486, the repair outlined in TSB 2064312/6 applies. If a different repair is suggested, this specific bulletin is not applicable.

Important Warnings

For PHEV Models: If your vehicle is a Plug-in Hybrid Electric Vehicle (PHEV), the repair procedure requires transmission removal. This necessitates deactivating the High Voltage (HV) system. Technicians must strictly follow all steps and safety precautions detailed in the Elsa Repair Manual for HV system deactivation.

Repair Procedure Summary

The repair process involves several steps, starting with a thorough inspection:

1. Initial Diagnosis: Follow Guided Fault Finding. If it points to the Parking Lock Solenoid N486, proceed with this TSB. If not, this TSB does not apply.
2. Mechatronics Unit Removal: The Mechatronics unit must be removed from the transmission, following instructions in the Elsa Repair Manual.
3. Visual Inspection: After removing the Mechatronics unit, the intake filter (Figure 2, positions 8 and 9) is removed to gain access to the bolts for pressure filter 2 (Figure 2, positions 10 and 11). A visual inspection is then performed on these bolts.
4. Repair Options Based on Findings: Depending on the inspection results, one of three repair options is performed:
   • Option 1 (Loose Bolts): If one or more bolts are loose, or the securing ring is not flush to the valve body (Figure 4 shows loose bolts), the cover (with seal) and the bolts are replaced.
   • Option 2 (Broken Bolts): If one or more bolt heads are broken off or missing (Figure 5 shows a missing bolt head), technicians attempt to remove any remaining bolt pieces by hand. If successful, a new cover and bolts are installed. If pieces cannot be removed, the entire Valve Body must be replaced.
   • Option 3 (Tight Bolts): If all three bolts are found to be tight, the Parking Lock Solenoid N486 and its associated pressure pipe (Figure 4 illustrates the pressure pipe) are replaced.
5. Final Test Drive: After completing the repair, a test drive is performed to confirm proper operation of the gearbox.

Required Tools or Parts

Technicians will need to refer to the Elsa Repair Manual for detailed instructions on removing the Mechatronics unit, replacing components, and ensuring proper reassembly. Specific part numbers for covers, seals, bolts, and solenoids will be identified using ETKA and the workshop manager based on the chosen repair option.

Owner Action

If your 2021-2023 Audi A4, A4 allroad, A5, A5 Cabriolet, A5 Sportback, A6, A6 allroad, A7, Q5, or Q5 Sportback exhibits a "Gearbox Malfunction" warning or loss of drive, it is crucial to have your vehicle inspected by an authorized Audi service center. They will perform the necessary diagnostics and repairs as outlined in TSB 2064312/6. Repairs performed under warranty will be free of charge, as per Audi's warranty policies.

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Source: NHTSA ID 11009934