2021-2022 Audi Gearbox Malfunction Warning P17F900 TSB

Audi Technical Service Bulletin (TSB) 2064312/3, issued on January 13, 2022, provides detailed instructions for diagnosing and repairing a specific gearbox malfunction. This bulletin supersedes TSB Group 35 number 21-40 dated December 22, 2021. It addresses instances where a "35 Gearbox Malfunction warning on" message appears and the diagnostic trouble code (DTC) P17F900 is stored in the Transmission Control Module (TCM).

This TSB is crucial for owners experiencing an Audi P17F900 gearbox malfunction, as it details the exact steps technicians should follow to resolve the underlying mechanical issue.

Symptoms

Owners of affected 2021-2022 Audi vehicles may notice the following symptom:

• A dashboard warning message stating: "The gearbox malfunction message is on."

Fault Codes / DTCs

When diagnosing this issue, technicians will find a specific diagnostic trouble code stored in the Transmission Control Module (TCM), also known as J217 (address word 0002). This TSB specifically applies when the following DTC is present:

Code	Description	Symptom Code
P17F900	Parking lock Mechanical malfunction	22345

Other related DTCs indicating low hydraulic pressure may also be present.

Diagnosis and Trigger Conditions

For this TSB to apply, the DTC P17F900 with symptom code 22345 must be stored as 'Active/Static' in the TCM. If the DTC is not active or static, or if the symptom code does not match, this TSB is not applicable.

Diagnosis begins with following the Guided Fault Finding (GFF) procedure for the DTC. The repair outlined in this bulletin is only to be performed if the GFF test plan specifically recommends replacing the Parking Lock Solenoid N486. If GFF suggests a different repair, this TSB does not apply.

Important Warnings

Owners and technicians should be aware of the following critical information:

• "If the DTC is not active/static and/or the symptom code does not match, this TSB does not apply."
• "If Guided Fault Finding recommends a different repair this TSB does not apply."
• "PHEV Models require transmission removal which requires the HV system to be deactivated. Read and follow all of the Elsa Repair Manual steps and safety precautions."

Repair Procedure Summary

The repair process for the Audi P17F900 gearbox malfunction involves several steps, starting with the removal of the Mechatronics unit. After removal, a visual inspection of the bolts for pressure filter 2 is performed. This filter is the smaller of two canister filters attached to the Mechatronics unit with three bolts.

Based on the inspection, one of three repair options will be followed:

Option 1: Loose Bolts

If one or more bolts are found to be loose, or if the securing ring is not flush with the valve body, the pressure filter 2 and its associated bolts are replaced.

Option 2: Broken Bolts

If any of the pressure filter bolts are found to have broken heads or are missing, the Valve Body is replaced. If a suitable valve body is not available for the specific vehicle, the entire Mechatronics unit is replaced instead.

Option 3: All Bolts Tight

If all three bolts are found to be tight and secure, the Parking Lock Solenoid N486 and its corresponding pressure pipe are replaced.

Following any of these repairs, a test drive is required to confirm proper operation of the gearbox.

Required Tools or Parts

All repair options necessitate the removal and installation of the Mechatronics unit, which involves various fasteners, bolts, nuts, and screws as detailed in the Elsa Repair Manual. Specific parts vary by repair option and transmission type (e.g., OCK, ODK, OCJ, OHL). Key components that may be replaced include:

• Common Parts: Oval Hexagon socket head bolts (N 10156207), Tubes (0CK325107F, 0CK325319A), Threaded plugs (0CK321439A), various Gaskets (e.g., 0CK301191A, 0DK321371, 0DK315380, 0CK325444 series, 0CK927523, 0CK321371A), O-Rings (0DK 301 302, WHT 009 273), Hex head bolts (N 10739402, N 10710402).
• Option 1 Specific: Pressure Filter (0CK325149D), Cover with seal (0CK325371D), Round Head Screws (N 10787901, N 10787701), Suction Filter (0CK325421A).
• Option 2 Specific: Valve Body (Order to VIN), Hexagon socket flat bolts (N 10801101), Hexalobular flange screws (N 91127901).
• Option 3 Specific: Hydraulic control unit (N486) (0CK325497H), Hexagon socket flat head bolt (N 91126101), Hexalobular flange screw (N 91173601).

For PHEV models, additional parts related to transmission removal and catalytic converter work may be required, such as clamps and gaskets.

Owner Action

If your 2021-2022 Audi A4, A5, A6, A7, or Q5 displays the "35 Gearbox Malfunction warning on" message or you suspect an Audi P17F900 gearbox malfunction, it is recommended to schedule an appointment with an authorized Audi dealer. They will perform the necessary diagnostics using Guided Fault Finding to confirm the presence of DTC P17F900 and determine the appropriate repair option.

Warranty coverage for this repair is typically available for vehicles up to 48 months or 50,000 miles, or for Audi Certified Pre-Owned (CPO) vehicles under program G10. If your vehicle is outside of warranty, this Technical Service Bulletin serves as informational guidance for the repair.

Revision History

This TSB has undergone several revisions:

• Revision 3: Updated labor operations for 3.0 TFSI models and added 3.0 TFSI model-specific parts to the required parts and tools list.
• Revision 2 (December 22, 2021): Revised the title, added notes for PHEV models regarding service and warranty, and updated required parts and tools for 0DK specific parts, including a correction to a part number.
• Revision 1 (October 20, 2021): Initial publication of the bulletin.

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Source: NHTSA ID: 10206944