2021-2022 Audi A6 Gearbox Malfunction P17F900 TSB

Owners of certain 2021-2022 Audi A4, A5, A6, A7, and Q5 models equipped with the DL382 transmission may encounter a "Gearbox Malfunction" warning message. This issue is typically accompanied by the diagnostic trouble code (DTC) P17F900, indicating a "Parking lock Mechanical malfunction" with symptom code 22345, stored in the Transmission Control Module (TCM), J217. Audi Technical Service Bulletin (TSB) 35 21 39 2064312/1 provides detailed instructions for technicians to diagnose and resolve this specific Audi A6 gearbox malfunction P17F900.

Symptoms

Owners will primarily notice a warning message displayed on the instrument cluster. The most common symptom reported is:

• "The gearbox malfunction message is on."

This message signals a potential issue with the vehicle's transmission system. Technicians may also find other DTCs related to low hydraulic pressure.

Fault Codes / DTCs

The primary diagnostic trouble code associated with this gearbox malfunction is:

• DTC P17F900: Parking lock Mechanical malfunction (with symptom code 22345)

This code is stored in the Transmission Control Module (TCM), specifically J217 (address word 0002). The TSB specifies that this repair applies if DTC P17F900 with symptom code 22345 is stored as Active/Static.

Diagnosis and Trigger Conditions

Diagnosis begins with following the Guided Fault Finding procedure for DTC P17F900. If this diagnostic process recommends replacing the Parking Lock Solenoid N486, technicians should proceed with the TSB's repair steps. If a different repair is indicated by Guided Fault Finding, this TSB does not apply.

After removing the Mechatronics unit, a visual inspection is crucial. Technicians must check the installation of the bolts for pressure filter 2. This is the smaller of two canister filters installed in the Mechatronics unit, secured by three bolts. The condition of these bolts determines the specific repair path.

Repair Procedure Summary

TSB 35 21 39 2064312/1 outlines three distinct repair options based on the visual inspection findings:

Option 1: Loose Bolts

If one or more bolts securing pressure filter 2 are loose, or if the securing ring is not flush with the valve body, the repair involves replacing pressure filter 2 along with the associated bolts. This procedure is performed as described in the Workshop Manual.

Option 2: Broken or Missing Bolt Heads

Should any of the bolts have broken off or be missing, the Valve Body must be replaced. The Transmission Control Module (TCM) should be reused. If a new valve body is unavailable, the Mechatronics unit itself should be replaced, and this noted on the repair order.

Option 3: All Bolts Are Tight

If all three bolts are found to be tight, the repair requires replacing both the Parking Lock Solenoid N486 and its associated pressure pipe. This is done according to the Elsa Repair Manual.

After any of these repair options, a test drive is mandatory to confirm proper operation of the transmission and ensure the Audi A6 gearbox malfunction P17F900 is resolved.

Required Tools and Parts

Several parts are required for these repairs, with some common to all options and others specific to each. Always consult ETKA or the Parts Department for the latest information.

Common Parts for All Repair Options:

• N 10156207: Oval Hexagon socket head bolts (Pan Bolts) (25)
• 0CK325107F: Tube (01)
• 0CK321439A: Threaded plug (02)
• 0CK301191A: Gasket (01)
• N 10739402: Bolt, hex head with shoulder (07)
• 0CK325444: Gasket (01)
• 0CK325445: Gasket (01)
• 0CK325443: Gasket (01)
• 0CK325446: Gasket (01)
• 0CK927523: Gasket (01)
• 0CK321371A: Gasket (01)
• Various fasteners, bolts, nuts, and screws as needed per ETKA/ELSA.

Additional Parts for Repair Option #1 (Loose Bolts):

• 0CK325149D: Pressure Filter (01)
• 0CK325371D: Cover with seal (01)
• N 10787901: Round Head Screw (04)
• 0CK325421A: Suction Filter (01)
• N 10787701: Round Head Screw (02)

Additional Parts for Repair Option #2 (Broken/Missing Bolt Heads):

• Valve Body (01) (ordered by VIN)
• N 10701101: Hexagon socket flat (03)
• N 91127901: Hexalobular flange screw (04)

Additional Parts for Repair Option #3 (All Bolts Tight):

• 0CK325497H: Hydraulic control unit (N486) (01)
• 0CK301131B: Gasket (01)
• N 10710402: Oval hexagon socket head bolt (04)
• N 91126101: Hexagon socket flat head bolt (01)
• 0CK325319A: Tube (01)
• N 91173601: Hexalobular flange screw (01)

Important Warnings

Owners should be aware of the warranty coverage for this repair. The TSB states that warranty claims are covered for up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, coverage is under G10, but ownership must be verified. If the vehicle is outside any applicable warranty, this Technical Service Bulletin serves as informational guidance only, and repair costs may not be covered.

Owner Action

If your 2021-2022 Audi A4, A5, A6, A7, or Q5 displays a "Gearbox Malfunction" warning or you suspect an issue related to the Audi A6 gearbox malfunction P17F900, it is recommended to schedule an appointment with an authorized Audi service center. Provide them with the symptom details and mention Technical Service Bulletin 35 21 39 2064312/1. The technicians will perform the necessary diagnostics and repairs based on the TSB guidelines.

NHTSA ID: 10202586