8-Speed Automatic Transmission Assembly for 2011-2015 Audi & Volkswagen
Product Notes Read before buying
This is an 8-speed automatic transmission with code MHN. It fits vehicles with the 3.0L gasoline engine only. Please verify your vehicle's transmission code is MHN 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 |
|---|---|---|---|---|
| Base | SUV | 2011, 2013 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Elite | SUV | 2011 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Luxury | SUV | 2011 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Premium | SUV | 2011 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Premium Plus | SUV | 2011 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Prestige | SUV | 2011 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| S Line | SUV | 2011 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Sport | SUV | 2011 - 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Land of Quattro | SUV | 2014 | V6 3.0L Supercharged | AWD | Automatic |
| Progressiv | SUV | 2015 | V6 3.0L Supercharged | AWD | Automatic |
| Vorsprung | SUV | 2015 | V6 3.0L Supercharged | AWD | Automatic |
| 2012 |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| 2011 - 2012 |
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:
- Locate the vehicle data sticker in the trunk or service booklet and confirm the transmission code is MHN.
- Confirm the vehicle has the 3.0L V6 Supercharged Gasoline engine (not the 3.0L TDI Diesel).
- Physically inspect the metal tag on the bottom left side of the transmission case to verify MHN and part number 0C8300036Q.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- VAG-compatible diagnostic scanner (VCDS or ODIS)
- Transmission fluid fill adapter (M10x1.0 thread) and fluid pump
- Engine support bar
- Professional-grade transmission jack
- Triple-Square (XZN) sockets
Budget for these consumables at install:
- ATF meeting VW/Audi G 055 540 A2 (or G 060 162 A2 depending on exact transmission design)
- Internal filter (OEM Part #0C8325435) and pan gasket (OEM Part #0C8321371)
- Torque converter input shaft seal
- Transmission cooler line flush solvent
What your vehicle’s computers will need after the swap:
What’s involved: TCM Adaptive Relearn / Component Protection Removal
sources differ: Arm 1 states no programming is required if reusing the original external TCM (Aisin 0C8 design). Arm 2 states this is a ZF 8HP unit requiring dealer-level ODIS online programming to clear Component Protection. The safer position is to assume programming/dealer tools may be required depending on the exact design variant installed.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must click three times and seat fully to avoid crushing the internal oil pump gears upon bolting to the engine.
- The Green Level Straw: Ensure the plastic overflow tube inside the drain plug hole is present and undamaged to set the fluid level correctly.
- Strict Fluid-Leveling Procedure: Must be performed on a level lift, engine idling, with fluid temperature strictly between 35°C and 45°C (or 30-50°C) monitored via scan tool.
- Dowel Pin Alignment: Ensure metal alignment dowel sleeves on the back of the engine block are in place to prevent severe drivetrain vibrations.
Easy to get right once you know them:
- Buying the Wrong Fluid: Confusing Aisin G 055 540 A2 / Toyota WS spec fluid with ZF-spec fluid (or vice versa).
- Skipping the Adaptation Reset: Driving off without clearing the TCM's learned adaptation values, causing immediate clutch damage or harsh shifting.
- Misdiagnosing a Bad TCM or Wiring: Replacing the transmission when the issue is actually a water-damaged TCM under the passenger seat due to clogged sunroof drains.
- Reusing a Contaminated Cooler: Failing to flush the cooler and lines, which washes old metal shavings directly into the replacement unit's valve body.
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: Check connector for green corrosion; replace the switch and its sub-harness if present.
🔎 Recommended at install: Update software flash for the Transmission Control Module (TCM).
🔎 Recommended at install: Replace torque converter or repair valve body TCC limit valve bore.
🔎 Recommended at install: Regular fluid changes; replace solenoids or valve body if clogged.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-51839-1947758). 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
2011-2015 Audi Q7 & 2011-2012 VW Touareg Aisin TR-80SD / 0C8: Problems, Identification, and Used Replacement
Identify the exact MHN transmission code, diagnose common valve body and torque converter failures, and learn when to replace it with a quality 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: 0C8300036Q
Other: MHN
Fits Years: 2011 2012 2013 2014 2015
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Backed By The Selling Yard
This unit ships with the selling yard's 120-day warranty. Longer plans can be requested during checkout.
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