If not, you likely have an issue in your wiring. Start the car and check if PRND at the gear lever is working.(new oil, sealings and filter) Beware when checking oil, it will instantly spill, if you open too wide! Even if not, it's likely a good idea to do a service when you're already on it. Often used transmissions are emptied at the scrapyard, so you need to fill them up. At this point you also may open the oil-filler screw slightly and check if there's even any fluid in there.If not, you likely have an issue with the wiring! It should instantly recognize your car now. Once the transmission is in place and wired, you can check for communication with xHP.Make sure the transmission comes with the matching torque converter! The one from the GM transmission will not match the ZF trans!īoth lists are not complete, but other HW# may have issues communicating and would need to be flashed before even P/R/N/D shifting is possible. They would need to be bench-flashed before they are able to communicate in their new environment.įor cars 2007 and above, those are safe to use: 7573661, 7591971 Those communicate on K-Line and you won't be able to reach them through the OBD port. Note: Do NOT use transmissions from X3 E83 or Z4 E85/E86 in your E87/E88 or E9x car. The program number can be found on a white sticker, at the driver-side of the transmission and is preceeded by "HW".įor 2005/2006 N52 cars, those are safe to use: 7563275, 7564645 There are many different program numbers out there and not all of them will work in your N52 car. It's pretty easy, to tell if you're looking at a 6HP19 or 21, cause it's stamped in the housing on the driver-side. How do I find the correct ZF for swapping? (this depends on the program variant used in the DME and TCU and even may stop to work after updating one of them, so don't do it). NOTE: Although TCU's from non-LCI cars can work in LCI vehicles, you may run into problems. As a rule of thumb search for a 6HP19 if your car is 2006 and before, all others are fine with a 6HP21. The 6HP came in 3 sizes and all cars that came with the GM 6L45 need a 6HP19 or 6HP21 for swapping. The safest way of course is to source a ZF trans that comes from the very same car and build date, but this isn't mandatory and sometimes not even possible when only GM was used in that period. However, you need to make sure your are getting a ZF that matches your car and has the correct TCU fitted. (Note: the parts cataloge ALWAYS spits out "6HP19Z", regardless if the car in question has a 6HP19 or 6HP21. TU stands for "Technische Uberarbeitung" and is kind of the LCI version of the 6HP. We did this swap on a 2009 130i (LCI), so the transmission to source was a 6HP21, sometimes called 6HPTU. However, some auxiliary things need to be changed and you need to make sure to source the right ZF transmission, which is where your journey should start. As both transmissions were used in production and OEM's always tend to do as little variants of certain parts as possible, this isn't surprising at all. It will bolt on the engine side and it will bolt to your driveline. Some might disagree, but even if not "xHP-ed" the ZF is superior to the GM in many aspects and despite there are some traps, it's easy to swap when being prepared with the right parts and knowledge.įirst of all, the correct ZF is a direct swap in any BMW with GM 6L45. We're not shy to say, you won't recognize your car again. (xHP only works for ZF) While it is out of scope for us, to redo our development for the few cars with GM unit, it's pretty easy to swap your GM unit for a ZF and take advantage of an immense performance and fun gain. xHP will also tell you "not supported" when a GM trans is in your car) This creates constant confusion among potential xHP customers, whether they can use xHP or not. (Hint: your BMW Dealer can, based on your VIN. Online part-catalogs aren't able to determine whether a certain N52 vehicle at a certain build date got fitted with a GM or ZF unit. (E8x) Do I have a GM or ZF in my N52 BMW? Most commonly the GM unit is found in the US-Versions of 325i and 330i (E9x) and the 125i/130i. However, BMW with N52 (and N43) engines were sometimes equipped with the GM unit. Usually all BMW with 6-Speed Auto were fitted with either the ZF 6HP19/21, ZF 6HP26/28 or ZF 6HP32/34.
Thanks to various circumstances, BMW had to fit a certain amount of vehicles in the period from roughly 2006 - 2010 with a 6-Speed GM Automatic Transmission, instead of the 6-Speed unit from ZF.
#GM 6 SPEED TRANSMISSION PROBLEMS HOW TO#
This guide covers everything you need to know to swap your BMW with N52 engine from GM to a ZF6HP transmission! It will not cover the general tasks how to remove your transmission from your car (which any mechanic can do) but the specifics you need to know for this particular swap.
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