Automatic Transmission Assembly for 2005 Audi A6
Product Notes Read before buying
This automatic transmission is for vehicles with the specific transmission ID code 'HLL'. Please verify this code on your original transmission before ordering to ensure correct fitment.
Voice or type your vehicle details and Wrenchy will confirm fitment in seconds.
Vehicle Fitment Guide
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| 2005 |
Know This Transmission Before You Buy
The research behind our purchase interview — recalls, bulletins and real install economics for this transmission family:
A quick look at your own vehicle makes sure the right transmission shows up:
- Confirm transmission code is exactly HLL on the vehicle data sticker or the metal plate on the bottom front of the transmission case.
- Verify engine is the 4.2L V8 and the vehicle is a Quattro (AWD) model.
- Count the transmission oil pan bolts (13-bolt vs 23-bolt) to order the correct filter kit.
- Check current ATF color (green vs tan/gold) to determine the correct fluid specification.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- VCDS (Vag-Com) or ODIS diagnostic scan tool
- Transmission fluid fill pump with angled adapter
- Torx and triple-square socket sets
- Engine/transmission support fixture
- Transmission jack
Budget for these consumables at install:
- Automatic Transmission Fluid (ATF) - ZF Lifeguard 8 (Audi Spec G 060 162 A2, green) or ZF Lifeguard 6 (Audi Spec G 055 005 A2, tan/gold) depending on TCM software version. Do not mix.
- Filter & Pan Gasket Kit (Verify 13-bolt vs 23-bolt pan design)
- Torque Converter Input Shaft Seal
- Mechatronics Seals (Rubber bridge seal ZF P/N 0501215718 and four tubular sealing sleeves)
- Front Differential Fluid: SAE 75W90 synthetic gear oil (Audi Spec G 052 145 S2), approx. 1.1 liters
- Center Differential (Torsen) Fluid: Audi Spec G 055 145 A2 (with Sturaco modifier), approx. 0.55 liters
- Aerosol transmission cooler flush
- Single-use subframe stretch bolts (Audi P/N N-910-666-01)
What your vehicle’s computers will need after the swap:
What’s involved: Component Protection (CP) and Immobilizer re-marriage
The TCM is locked to the original vehicle's VIN. When swapped, it will lock into Safe Mode (limp mode) and display 'SAFE' on the cluster. Unlocking requires an authorized Audi dealer or specialist using ODIS with online GEKO access. Alternatively, physically swap your original mechatronics unit into the replacement transmission to bypass programming.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must be fully seated into the pump gears (two distinct drops) before bolting to the engine. Forcing it will crack the oil pump.
- Fluid Fill Temperature & Procedure: Must be filled from the bottom with the engine running, transmission in Park, and ATF temperature strictly between 35°C and 45°C monitored via scan tool.
- Subframe Crossmember Removal: Requires removing the subframe crossmember to access the pan, which uses single-use stretch bolts that must be replaced.
- Starter Removal: On the 4.2L V8, the starter must be removed to access and unbolt the torque converter from the flexplate.
Easy to get right once you know them:
- Ordering with the wrong transmission code (must be exactly HLL).
- Mixing ATF colors/types (Lifeguard 6 vs Lifeguard 8) without matching the TCM software version.
- Failing to replace the mechatronics bridge seal and sleeves during the swap.
- Stripping the soft Torx pan bolts.
- Ignoring Component Protection requirements and failing to plan for dealer programming or a mechatronics swap.
- Not fully seating the torque converter, leading to a broken front pump.
- Skipping the transmission cooler flush, which introduces old debris into the replacement unit.
Not issues with the units on this page — the manufacturer documented these for every transmission of this family, wherever you buy one. Handy for your installer:
🔎 Recommended at install: Flush system and replace fluid with updated green ATF (ZF Lifeguard 8 / G 060 162 A2) and perform a TCM software update.
🔎 Recommended at install: Update TCM software via Audi's Software Version Management (SVM) and perform a transmission adaptation drive.
🔎 Recommended at install: Replace the rubber adapter seal (bridge seal) and the four tubular sealing sleeves concurrently during the swap.
🔎 Recommended at install: Replace solenoids within the Mechatronic unit to resolve harsh downshifts, slipping, or failure to engage.
🔎 Recommended at install: Replace torque converter to prevent shuddering, RPM fluctuations, and fluid contamination.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-61893-948539). Unit-specific details — mileage, condition, warranty, freight — are covered in the checkout interview.
Policies, in plain English.
Shipping & Handling
- Ships by LTL freight on a pallet — a real freight truck, not a parcel van
- Your checkout freight quote covers delivery to your door (liftgate service included for residential addresses)
- The carrier calls ahead to schedule a delivery window — someone must be present to receive it
- Typically palletized and picked up within 2–3 business days; transit time depends on distance
120-Day Warranty
This part includes a 120-day warranty.
- If the part fails within the warranty window, we'll replace it or refund per the coverage terms
- Coverage is parts-only — installation labor is not included
- Warranty covers defects — not installation errors, misuse, or damage after installation
Your pre-purchase interview reviews these exact terms with you before anything is charged.
Returns (30 Days)
We accept returns of uninstalled parts within 30 days of delivery for this part.
- Defective parts: We will replace the part or issue a refund at our discretion
- Programming: "Needs to be programmed to my vehicle" is not a valid return reason. Many modules require dealer programming — we're happy to help connect you with resources if your dealer says it's not programmable
- Return shipping: This part ships by freight (LTL) — the part price is refundable per the terms above, but shipping costs are non-refundable and return freight follows the seller's return terms. Your pre-purchase interview walks through the exact numbers before you buy
- Parts must be returned in original packaging and unmodified condition
- Poorly packaged returns that arrive damaged will not be credited
Damaged in Shipping?
Freight damage is rare — and you're fully protected when you do two things at delivery:
- Inspect before you sign — you're allowed time to look the pallet over while the driver waits
- Write any damage on the delivery receipt before signing — that one line is what makes a freight claim succeed
- Severe damage? Refuse the delivery — it goes back at no cost to you and we make it right
- Photograph the pallet before unwrapping; report concealed damage within 24 hours of delivery
We handle the carrier claim — you just help document it. Your pre-purchase interview walks through this checklist too.
Order Cancellation
Cancel before shipment for a full refund. Once the pallet has been built, a preparation charge may apply — and once the freight carrier picks it up, shipping costs are non-refundable and standard return terms apply. Your pre-purchase interview shows the exact numbers before you pay.
Expert Guides
2005 Audi A6 4.2L V8 ZF 6HP: Problems, Identification, and Used Replacement
Identify the exact HLL transmission code, understand common Mechatronics failures, and learn when to replace it with a used OEM unit.
Read Full Guide →Related Trouble Codes (OBD-II)
1 matching guideIf your scan tool is showing one of these trouble codes, this part is a common fix. Each guide explains the code, how to diagnose it, and exactly what to replace.
Miscellaneous Information
OEM Part Numbers:
Audi: 09L300038B, 09L300038BX
Fits Years: 2005
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This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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