8-Speed Automatic Transmission Assembly for 2012-2013 BMW 335i
Product Notes Read before buying
This is an 8-speed automatic transmission for Rear-Wheel Drive (RWD) models equipped with the 3.0L engine. Fitment is very specific to vehicles produced between March 2012 and August 2012. Please verify your vehicle's production date 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 | Convertible | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| Base | Coupe | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| Base | Sedan | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| Exclusive | Convertible | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| Exclusive | Coupe | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| Luxury | Sedan | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| M Sport | Sedan | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| Modern | Sedan | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
| Sport | Sedan | 2012 - 2013 | L6 3.0L Turbo | RWD | Automatic |
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:
- Verify the transmission model on the ID tag is GA8HP45Z (8HP45).
- Confirm the vehicle is Rear-Wheel Drive (RWD) and not xDrive (AWD).
- Confirm the engine is the 3.0L twin-scroll turbocharged inline-6 (N55).
- Verify the vehicle production date on the door jamb matches the application window.
What the install really takes — plan and budget with confidence:
Special tools this job needs:
- Professional-grade fluid transfer pump
- Diagnostic scan tool (e.g., BMW ISTA, INPA) capable of reading real-time fluid temperature
- Specialized BMW programming tool (e.g., Autel IM608, VVDI BIMTool, AutoHex II)
- Torx and E-Torx socket sets (including T40)
- Engine support bar
- Torque wrenches
Budget for these consumables at install:
- ZF Lifeguard 8 fluid (or Shell L12108 / BMW ATF 3+)
- New integrated plastic oil pan, gasket, filter, and single-use pan bolts
- Torque converter input shaft seal
- Transmission cooler line flush agent
- Exhaust gaskets and hardware
- Driveshaft Guibo (Flex Disc) and hardware (inspect/replace)
What your vehicle’s computers will need after the swap:
What’s involved: EGS ISN Reset / Virginization and VIN coding
The integrated EGS module is locked to the donor vehicle's security system (EWS4). It must be virginized and programmed to match the vehicle's VIN, or the original Mechatronic unit must be swapped into the replacement transmission.
Pro tips for a smooth first start-up — hand them to whoever does the install:
- Torque Converter Seating: Must be fully seated (three distinct clicks/drops) before bolting to the engine to avoid crushing the internal oil pump.
- Strict Fluid-Fill Temperature Window: Final fluid level check must be performed with the engine running and fluid temperature strictly between 30°C and 50°C (86°F to 122°F). Never open the fill plug with the engine off.
- Pan Bolt Torque Sequence: Plastic oil pan bolts are fragile and must be torqued in a specific sequence to exactly 10 Nm.
- Engine Alignment Dowels: Ensure alignment dowels are correctly positioned and not doubled up, which causes misalignment and severe vibrations.
Easy to get right once you know them:
- Assuming plug-and-play compatibility and skipping the mandatory EGS ISN security reset, leaving the transmission locked in Park.
- Ordering the wrong engine variant (e.g., 4-cylinder version) which has a different bellhousing bolt pattern.
- Improper fluid leveling, such as opening the fill plug with the engine turned off, leading to severe fluid starvation.
- Reusing single-use aluminum pan bolts, leading to broken bolts or fluid leaks.
- Failing to flush the transmission cooler, which recirculates debris from the failed unit into the replacement transmission.
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: Replace the rubber sealing sleeve for the main electrical connector.
🔎 Recommended at install: Perform software updates to address harsh shifting or delayed engagement.
🔎 Recommended at install: Replace the plastic oil pan assembly (which includes an integrated filter and gasket).
🔎 Recommended at install: Repair or replace the Mechatronic valve body/solenoids.
🔎 Recommended at install: Replace the torque converter and flush the system to prevent debris contamination.
🔎 Recommended at install: Replace the O-rings sealing the cooler lines to the transmission case.
Researched from factory recalls, TSBs and OEM service data (reference unit 400-62287-3168442). 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
2012-2013 BMW 335i ZF 8HP45 Transmission: Problems, Identification, and Used Replacement
Learn how to identify the GA8HP45Z 8-speed automatic, diagnose common Mechatronic and torque converter failures, and successfully install a used OEM replacement.
Read Full Guide →Related Trouble Codes (OBD-II)
6 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:
BMW: 24007643677, 7643677
ZF: GA8HP45Z
Fits Years: 2012 2013
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