2021-2023 Audi Gearbox Malfunction with DTC P17F900

Symptoms of a Gearbox Malfunction

Owners of 2021-2023 Audi A4, A5, A6, A7, and Q5 models equipped with the DL382 transmission may experience specific symptoms indicating a gearbox malfunction. These include a prominent "The gearbox malfunction message is on." displayed in the instrument cluster. Additionally, drivers might notice a significant loss of power, with the vehicle having "The vehicle has no drive."

Fault Codes / DTCs

When these symptoms occur, the Transmission Control Module (TCM), identified as -J217- (address word 0002), typically logs specific Diagnostic Trouble Codes (DTCs). These codes indicate the nature of the internal transmission issue. The Audi gearbox malfunction DTC P17F900 is a key indicator.

DTC Code	Description	Symptom Code
P17F900	"Parking lock Mechanical malfunction"	22345
P074700	"Solenoid valve 1 stuck operated"	20968
P077700	"Solenoid valve 2 stuck operated"	20969

These event memory entries can occur either individually or in combination, pointing to various issues within the DL382 transmission.

Diagnosis and Trigger Conditions

Audi Technical Service Bulletin (TSB) 2064312/7, dated December 13, 2024, addresses these transmission issues. This bulletin supersedes TSB Group 35 number 24-53 dated October 29, 2024. The underlying technical background for these DTCs is often related to loose bolts on the cover for high-pressure filter 2 within the transmission. Technicians will utilize Guided Fault Finding for initial diagnosis. If the test plan indicates replacement of the Parking Lock Solenoid N486, the repair procedure outlined in this TSB should be followed.

Repair Procedure Summary

The repair for the Audi gearbox malfunction DTC P17F900 and related codes involves a multi-step process. After confirming the DTCs, a technician will follow Guided Fault Finding. If prompted with "Is a TPI available for this error?", the response "No" must be selected to continue the analysis process. If Guided Fault Finding recommends a different repair, this TSB does not apply.

The general procedure involves:

1. Mechatronics Unit Removal: The Mechatronics unit is removed from the transmission according to the Elsa Repair Manual.
2. Inspection of Pressure Filter Bolts: The intake filter is removed to access and visually inspect the bolts for pressure filter 2. These are the three bolts attaching the smaller of the two canister filters to the Mechatronics unit.
3. Repair Options Based on Findings:
   • Option 1 (Loose Bolts): If one or more bolts are loose, the cover (with seal) and the bolts are replaced.
   • Option 2 (Broken/Missing Bolt Heads): If bolt heads are broken or missing, the cover for the high-pressure filter is removed. The technician attempts to remove any remaining bolt pieces by hand. If successful, a new cover and bolts are installed. If removal by hand is not possible, the entire Valve Body is replaced.
   • Option 3 (All Bolts Tight): If all three bolts are tight, the Parking Lock Solenoid N486 and the associated pressure pipe for the N486 are replaced.
4. Test Drive: After the repair is completed, a test drive is performed to confirm proper operation of the transmission.

Important Warnings for Owners and Technicians

• Technicians are advised to "Please read the entire work procedure before starting the actual work so the scope and number of the repair options are understood completely."
• During Guided Fault Finding, if the system prompts "Is a TPI available for this error?" the response "No" must be selected, as choosing otherwise will prevent the analysis process from continuing.
• "If Guided Fault Finding recommends a different repair this TSB does not apply." to the vehicle.
• For PHEV Models, a critical "NOTICE 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." must be observed.

Warranty Information

Warranty claims related to this TSB must be submitted in accordance with the Audi Warranty Policies and Procedures Manual. The Service Number for this repair is 3511, and the Damage Code is 0010. The claim comment should reference "As per TSB 2064312/7". It is important to note that "If the vehicle is outside any warranty, this Technical Service Bulletin is informational only."

NHTSA ID: 11012485