8-Speed Automatic Transmission Assembly for 2014-2015 Audi A6
Product Notes Read before buying
This is an 8-speed automatic transmission for 2.0L turbocharged gasoline engines with AWD (Quattro) only. Fitment is confirmed by the transmission ID 'QCU'. Please verify this ID on your original transmission before ordering.
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 |
|---|---|---|---|---|
| 2014 - 2015 |
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 the transmission code is QCU on the vehicle data sticker (found in the spare tire well or inside the owner's service book).
- Verify the physical metal identification plate on the underside of the current transmission case matches the QCU code and 0BK designation.
- Confirm the vehicle is a quattro (AWD) model with a 2.0L Turbo engine.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- VAG-compatible diagnostic scan tool (VCDS, OBDeleven, or ODIS)
- Fluid transfer pump with hook-style filler adapter (e.g., CTA 7411)
- Triple square (XZN) sockets (M10, M12)
- Torx bits (T45, T50)
- Engine support bar
- Transmission jack
Budget for these consumables at install:
- OE-Spec Transmission Fluid: ZF Lifeguard 8 (Audi Spec G 060 162 A2)
- Filter & Pan Gasket Kit (OEM Part Number: 0BK398009 / integrated plastic pan assembly)
- Torque Converter Seal
- Mechatronics connector sleeve O-ring
- One-time-use stretch bolts (subframe braces, transmission mounts, axle bolts, driveshaft bolts)
- Dedicated transmission cooler flush
What your vehicle’s computers will need after the swap:
What’s involved: VIN-specific programming, Immobilizer re-marriage (Component Protection), and TCM adaptive relearn.
The integrated TCM inside the mechatronic unit is locked under Audi's Component Protection anti-theft system. Once installed, the transmission will enter a restricted 'safe' or 'limp' mode until it is married to the vehicle's immobilizer. This must be cleared by an authorized Audi dealership or an independent specialist with online GEKO access to Audi's central database using ODIS. A basic settings and adaptation drive cycle must then be performed.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Ensure the torque converter is fully seated onto the input shaft and pump gears before bolting to the engine. If not fully seated, bolting the bellhousing down will permanently crack and destroy the internal oil pump.
- Fluid Fill Procedure & Temperature: Fluid level is extremely temperature-sensitive. The final level check must be performed only when fluid temperature is between 30°C and 50°C (ideally 35°C to 45°C) with the engine idling and after cycling through the gears.
- Subframe & X-Brace Removal: Front subframe must be dropped/loosened and the aluminum chassis support X-brace removed. The bolts are torque-to-yield (stretch bolts) and must be replaced with brand-new ones.
- Draining the Wrong Fluid: Do not mistake the transmission drain plug for the engine oil drain plug, which is a common error on this platform.
Easy to get right once you know them:
- Ignoring Component Protection: Assuming the transmission is plug-and-play and then finding it locked in limp mode or refusing to shift out of Park.
- Reusing Subframe / Mount Stretch Bolts: Reusing torque-to-yield bolts can lead to them snapping or backing out, causing severe structural noise or safety hazards.
- Incorrect Fluid Level Check: Checking the fluid level with the engine off, which causes several liters of fluid to pour out, leaving the transmission severely underfilled.
- Using Generic ATF: Using multi-vehicle ATF instead of ZF Lifeguard 8, causing immediate shift shudder and clutch slippage.
- Skipping the Cooler Flush: Allowing metallic debris from the previous failed unit to circulate into the replacement transmission, voiding the warranty.
- Shifting While Rolling: Shifting from Reverse to Drive (or vice-versa) while the car is still moving, causing pressure spikes and severe wear.
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: Audi released updated TCM software and optimized transmission fluid to address this clutch-grab concern.
🔎 Recommended at install: Update the TCM software calibration.
🔎 Recommended at install: Replace internal TCM/Mechatronics unit if electronic failure occurs due to extreme heat cycles.
🔎 Recommended at install: Address adaptation limits (counter 255) causing harsh upshifts from 1st to 2nd and 2nd to 3rd gears.
🔎 Recommended at install: Software update for the Transmission Control Module (TCM).
🔎 Recommended at install: Replace deformed plastic oil pan/gasket and the O-ring for the main electrical connector sleeve.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-63152-2625038). 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
2014-2015 Audi A6 2.0T Quattro ZF 8-Speed: Problems, Identification, and Used Replacement
Identify the exact QCU transmission variant, understand common mechatronics failures, and learn when to replace it with a used OEM unit.
Read Full Guide →Related Trouble Codes (OBD-II)
3 matching guidesIf 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: 0BK300040K, 0BK300040K001
Other: QCU
Fits Years: 2014 2015
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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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