F55/F56/F57 Stock Problems/Issues Discussions related to warranty related issues and repairs, or other problems with the OEM parts and software for F55/F56 MINI Cooper AND Cooper S models.

Wiring diagram DCT transmission

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Old Feb 15, 2026 | 08:21 PM
  #1  
Czptp Px's Avatar
Czptp Px
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Wiring diagram DCT transmission

Would anyone have access to wiring diagram for the Getrag DCT automatic transmission (7dct300)? I have a short-circuit to B+ or line disconnect to the transmission pressure sensor 1. I'm trying to trace back to the short. Tested wire for ground. Signal and Reference line have same voltage, not 5V. Wiring loom appears intact. Might be another sensor on the same circuit drawing it down?

420C09 Pressure sensor 1: Short circuit to B+ or line disconnection signal
420C0A Pressure sensor 1: Signal exceeds upper threshold value

I have ISTA. I only got the diagram of the Sensor itself, missing the other things on the same line. If someone has the alldata Wiring diagram, that would be awesome.
 

Last edited by Czptp Px; Feb 19, 2026 at 07:07 PM.
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Old Feb 19, 2026 | 07:00 PM
  #2  
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Czptp Px
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With ignition on, engine off - supply line is 5.03V, Sensor is 4.88V and ground is 0. Both pressure sensor connectors measure the same. Thought of swapping the sensors physically but the good one is difficult to access, bad one is at the bottom of the car. Unfortunately, loom also won't reach to just swap connections as best I can tell although the lower line can reach the upper sensor.

Thought was to disconnect sensor 2 connector, plug in sensor 1 line
 

Last edited by Czptp Px; Feb 19, 2026 at 07:44 PM.
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Old Mar 4, 2026 | 03:55 AM
  #3  
67moris's Avatar
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Originally Posted by Czptp Px
Would anyone have access to wiring diagram for the Getrag DCT automatic transmission (7dct300)? I have a short-circuit to B+ or line disconnect to the transmission pressure sensor 1. I'm trying to trace back to the short. Tested wire for ground. Signal and Reference line have same voltage, not 5V. Wiring loom appears intact. Might be another sensor on the same circuit drawing it down?

420C09 Pressure sensor 1: Short circuit to B+ or line disconnection signal
420C0A Pressure sensor 1: Signal exceeds upper threshold value

I have ISTA. I only got the diagram of the Sensor itself, missing the other things on the same line. If someone has the alldata Wiring diagram, that would be awesome.
I’m having the same issues
 
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Old Mar 4, 2026 | 03:55 AM
  #4  
67moris's Avatar
67moris
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Originally Posted by Czptp Px
Would anyone have access to wiring diagram for the Getrag DCT automatic transmission (7dct300)? I have a short-circuit to B+ or line disconnect to the transmission pressure sensor 1. I'm trying to trace back to the short. Tested wire for ground. Signal and Reference line have same voltage, not 5V. Wiring loom appears intact. Might be another sensor on the same circuit drawing it down?

420C09 Pressure sensor 1: Short circuit to B+ or line disconnection signal
420C0A Pressure sensor 1: Signal exceeds upper threshold value

I have ISTA. I only got the diagram of the Sensor itself, missing the other things on the same line. If someone has the alldata Wiring diagram, that would be awesome.
Keep me posted thanks
 
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