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Title: 1.8t DQ250 conversation TCU Problem Post by: horon6155 on June 28, 2025, 12:56:42 PM Hello, Leuye. I installed a DQ250 from a MK5 GTI in my Golf MK4. I got the transmission very cheaply and now I know why.
At first, everything worked when it was cold. As soon as the transmission warms up, nothing works anymore. The lights flash. I then replaced all the selenoids and solenoid valves. It's much more pleasant when it shifts into R or D, but as soon as it warms up, the same thing happens again. Error codes 1815 and 1820. I then replaced the pressure sensors and changed the oil again. Now the same thing isn't happening. When I put the car in D while it's warm and accelerate, D starts flashing. As soon as I idle, it stops. Same thing with R. I then tried to do the basic settings, and since then I've been getting the error P1707 and everything is flashing again. I can't read the TCU with Autotuner or KESS3 either. I get errors. I think the TCU is defective. I want to get a new one, but they're extremely expensive. I thought I'd buy a DQ250 TDI transmission and simply transfer the TCU and install MK5 GTI software on it. Would that work, or are the mechatronics different? Title: Re: 1.8t DQ250 conversation TCU Problem Post by: _nameless on June 28, 2025, 09:16:51 PM Where are you located? I have a few mech units just chillin
Title: Re: 1.8t DQ250 conversation TCU Problem Post by: horon6155 on June 29, 2025, 03:44:44 AM I'm from Germany. What would you like for them? Are they functionally OK?
Title: Re: 1.8t DQ250 conversation TCU Problem Post by: _nameless on June 29, 2025, 01:02:34 PM I'm from Germany. What would you like for them? Are they functionally OK? Yeah Im in the states though. I have a few sitting in the trans still I can pull if needed Title: Re: 1.8t DQ250 conversation TCU Problem Post by: horon6155 on June 29, 2025, 03:14:19 PM Are they ones from the Golf MK5 GTI, or do all 02e TCUS fit together? Which one would you like?
Title: Re: 1.8t DQ250 conversation TCU Problem Post by: aef on June 30, 2025, 07:05:32 AM try to source a exx or fxx mechatronic instead of the old mk5 cxx mechatronic
Quote Here some informations about 02E Hardware Numbers assignment: GROUP "Cxx" EARLY UNITS all with analog inputs (for speed signal, shift paddles or reverse light control) (used moslty 2003-2004 some of them have additional pins in connector 02E927770 E 02E927770 G 02E927770 K 02E927770 L 02E927770 M 02E927770 AA GROUP "Cxx" (2004 - 2006) 02E927770 AD - replaces all EARLY analog units because can EMULATE analog inputs. 02E927770 AE - used only on cars from year 2004 which DO NOT use analog signals anymore. GROUP "Exx" (2007 - 2008) 02E927770 AJ - used as replacement for AE, CAN only, no K-Line anymore. 02E927770 AK - no information nor experiences til now. Very rare unit. GROUP "Fxx" (2008 - 2015) 02E927770 AL - replacement for AE, AJ 02E927770 AM - theoretically can be used on some cars which still needs AD, but special software versions are required. 02E927770 AT - replace AL IMMOBILIZED UNITS used on MQB cars with UDS diagnostic protokoll. Cannot replace NON-IMMO units, because of bootloader incompability. 02E927770 AN 02E927770 AQ 02E927770 AS Title: Re: 1.8t DQ250 conversation TCU Problem Post by: horon6155 on June 30, 2025, 09:15:13 AM And why? Are the exx or fxx better than the cxx? I don't even know which one I have. In any case, I know that the cxx has more pins, but mine only has the necessary pins for power, ground, can, and k-line, and two other pins, if I'm not mistaken. Actually, a cxx would be better for my golf mk4, if it fits, because it has a reverse gear signal, so I don't have to build a separate controller for it.
Title: Re: 1.8t DQ250 conversation TCU Problem Post by: aef on June 30, 2025, 01:09:23 PM its gambling.... you can buy another old cxx with more or less problems
or you can buy one of the latest fxx or mqb with less mileage Title: Re: 1.8t DQ250 conversation TCU Problem Post by: horon6155 on June 30, 2025, 01:54:19 PM Since the nameless guy isn't responding anymore, I'd like to return to my other question.
Can I use a 2.0 TDI TCU for my GTI transmission and install GTI software on it? Title: Re: 1.8t DQ250 conversation TCU Problem Post by: _nameless on June 30, 2025, 04:53:44 PM Are they ones from the Golf MK5 GTI, or do all 02e TCUS fit together? Which one would you like? Yeah its from a mk5. Since the nameless guy isn't responding anymore, I'd like to return to my other question.... LOL sorry I have a life outside this thread.Title: Re: 1.8t DQ250 conversation TCU Problem Post by: horon6155 on June 30, 2025, 11:39:07 PM I'm sorry, I didn't mean to offend you. Please don't misunderstand me. What kind of functioning TCU do you want? Ideally, an FXX TCU?
Title: Re: 1.8t DQ250 conversation TCU Problem Post by: _nameless on July 01, 2025, 01:32:40 AM I'm sorry, I didn't mean to offend you. Please don't misunderstand me. What kind of functioning TCU do you want? Ideally, an FXX TCU? The ones I have are CXX versions Title: Re: 1.8t DQ250 conversation TCU Problem Post by: horon6155 on July 02, 2025, 03:10:41 PM Hi. How much do you want for a mechatronics unit?
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