2021 Audi A6 Transmission Malfunction DTC P071800 TSB

Owners of certain 2018-2021 Audi models, including the 2021 Audi A6, may experience transmission-related issues accompanied by warning messages or abnormal shifting behavior. This Technical Service Bulletin, identified as 34 22 56 2060242/3, provides diagnostic and repair instructions for technicians when the Diagnostic Trouble Code (DTC) P071800 is stored in the Transmission Control Module (TCM).

This bulletin, dated April 8, 2022, supersedes a previous TSB, Group 34 number 22-54, from March 17, 2022. Revisions included updates to the title and condition, removal of DTC P081100, expanded model codes, and added parts, tools, and warranty information for ODK transmissions.

Symptoms

Owners might notice one or more of the following indicators of a transmission issue:

• The message "Transmission Malfunction" is displayed in the instrument cluster.
• The vehicle has no drive.
• The vehicle temporarily does not shift gears up or down.
• The message "Transmission Malfunction" with "Journey can be continued with restrictions" is displayed in the instrument cluster.
• The vehicle is in emergency operation.
• The message "Reverse gear not available" is displayed in the instrument cluster.

Fault Codes / DTCs

When these symptoms occur, a workshop diagnosis may reveal the following DTC stored in the Transmission Control Module (TCM), J217 (address word 0002):

Code	Description	Symptom Code	Status
P071800	Input/Turbine Speed Sensor "A" Circuit Intermittent	20736	passive/sporadic
P071800	Input/Turbine Speed Sensor "A" Circuit Intermittent	20736	active/static

Other related faults may also be stored alongside the primary DTC P071800.

Diagnosis / Trigger Conditions

The diagnostic approach depends on the status of the DTC P071800:

• If DTC P071800 is active/static: If the DTC "P071800 sender 1 for gearbox input speed, interruption" is stored as active/static, the repair procedure outlined in this TSB does not apply. Technicians must complete the Guided Fault Finding test plan thoroughly and accurately. An Audi Technical Assistance Center (TAC) case should then be opened with the test plan attached or uploaded via GFF paperless for further assistance.
• If DTC P071800 is passive/sporadic: If the DTC "P071800 sender 1 for gearbox input speed, interruption" is stored as passive/sporadic, the recommended repair involves replacing specific components.

Repair Procedure Summary

For vehicles exhibiting the Audi A6 DTC P071800 as passive/sporadic, the repair involves replacing key transmission components. The procedure, referencing the Elsa repair manual, includes:

1. Component Replacement: Replacing the gear actuator module and the Transmission Control Module (TCM), J217.
2. Control Module Adaptation: After replacement, technicians must perform the "control module replacing" test plan using a scan tool to ensure proper adaptation and calibration.
3. Verification: A test drive is required to confirm the effectiveness of the repair and ensure the transmission operates correctly.

Required Tools or Parts

Performing the repair for the Audi A6 DTC P071800 requires specific parts and specialized tools. Technicians should always consult their Parts Department and/or ETKA for the latest information and parts bulletins. Key items include:

Parts

• Fasteners, Bolts, Nuts, and Screws (as needed per Repair Manual)
• Shift selector (Quantity: 1)
• O-Ring (for accumulator) (Part Number: WHT006777, Quantity: 1)
• Oiling Tray (Part Number: 0CK301378A, Quantity: 1)
• Hex socket head bolt (combi) –M6X30- (Part Number: N 91043601, Quantity: 11 or 25 depending on position)
• Hex socket head bolt M8X40 (Part Number: WHT002459, Quantity: 6)
• Hexagon socket head bolt -M8X40- (Quantity: 20)
• Gasket for housing (Part Number: 0CK301463A, Quantity: 1)
• Lock Ring (Must remove and measure original to order correct part, Quantity: 1)
• Gasket Multi-plate clutch (Part Number: 0CK301461, Quantity: 1)
• Gasket (Part Numbers: 0CK301164, 0CK301215, 0CK301166, 0CK325446, 0CK325444, 0CK325445, 0CK325443, 0CK301191A, OCK 301 164, OCK 301 215, OCK 301 166, ODK 301 166A, Quantity: 1 each)
• Control Unit for Automatic Gearbox (Quantity: 1)
• Hexagon socket flat head bolt (Part Number: N 10801101, Quantity: 3)
• Hexalobular flange screw M6X25 (Part Number: N 91127901, Quantity: 4 or 3 depending on position)
• Gasket for oil pan (Quantity: 1)
• Tube (Quantity: 1)
• Threaded plug (Quantity: 1 each for various positions)
• Hexalobular flange screw M6X22 (Part Number: N 91173601, Quantity: 4)
• Bolt, hex head with shoulder M6X90X70 (mechatronics bolts) (Part Number: N 10739402, Quantity: 7)
• Dual Clutch Gearbox Oil ATF (Automatic Transmission Fluid) (Part Number: G 055529A2, Quantity: 5 liters)
• Transmission oil MTF (Manual Transmission Fluid) (Part Number: G 052549A2, Quantity: 4 liters)
• Sealing Cap (Part Number: 0CK301257A, Quantity: 1)
• Radial shaft seal (Quantity: 1)
• Gasket for (Part Number: ODK 315 380, Quantity: 1)
• O-Ring (Part Numbers: WHT 009 273, WHT 003 379 C, WHT 006 741, Quantity: 1 or 2)
• Coolant adaptor with seal (Part Number: ODK 121 131 A, Quantity: 1)
• Bolt, with polygon socket hd. (Part Number: N 91104601, Quantity: 12)
• Double Grommet (Part Number: ODK 972 921, Quantity: 1)

Tools

• VAS6100 (Shop Crane)
• T40123A with T40123/2 (Dual Clutch Lifting Device with sleeve)
• T40099 (Pressure Stand)
• T40100 (Ruler)
• VAS6087 (Digital Depth Gauge)
• T40288 (Guide Pins - Gearbox -)
• 10-222A/2 (Engine Support Bridge - Additional Hooks)
• T40323 (Press Tool)
• VW771 (Slide Hammer Set)
• T40155 (Retaining Strap)
• 10-222A/12 (Engine/Gearbox Support Shackle)
• VW637/2 (Puller - Grease Cap)
• VAS1978/14A (Hot Air Blower)
• T40321 (Support)
• T40322A (Cover)
• T40305 (Assembly Tool)
• T40199 (Oil Sump Assembly Pin)
• VAS6122 (Engine Bung Set)

Tools only required for ODK transmission (PHEV):

• T40412 (Assembly Tool)
• T40410 (Lifting Device)

Owner Action

If your 2021 Audi A6 or other affected model exhibits the described symptoms or you suspect an Audi A6 DTC P071800, it is recommended to visit an authorized Audi dealer. The repair is covered under warranty for up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, the repair is also covered. If your vehicle is outside of these warranty periods, this Technical Service Bulletin serves as informational guidance.

NHTSA ID: 10210235