Seat Leon gearbox faulty sign

Jul 25, 2025
1
0
Hello,

I recently bought a Seat Leon (DSG 2017) 4 months ago. 2 months into owning it I get a red cog saying gearbox faulty, with the lever stuck in park. After restarting the car multiple times the red cog went away but there was an engine management light. I took it back to the place I got it from, they stated it was a technical glitch , there's nothing wrong with it, the guy took it for a drive and cleared the codes. A few days ago, the sign comes up again, this time I plugged in my obd scanner (recent purchase) and these codes came up:

Engine Control Module:
P091900- Gear shift position control error - severe

Transmission Control module:
P173400- Starter enable from selector lever sensor - severe
U010300- Lost communication with Gear shift module- severe

Steering colum Electronics:
B116229- Selector lever park position lock switch range/performance

Gateway
U000900
High speed CAN communication Bus (-) shorted to Bus (+)

I've rang up gearbox specialists near me and they've said it sounds like a mechatronic unit issue, which will cost from 2k-4k. I was just wondering is that how much these cost to fix/replace? And is it possible there's a lesser issue at hand? I still have 2 months of warranty left with the garage I bought it from but these guys keep telling me there's nothing wrong with it. I'm planning on getting the issue diagnosed and then taking it to them.

Thanks.
 
Jul 13, 2025
17
13
Poland
A fairly well-known problem in DSG transmissions. There is probably a faulty selector sensor or its wiring harness. The sensor is located under the gearstick lever, this is where I would look for the problem in the first place.
 
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Walone

Active Member
Feb 10, 2016
1,722
509
Near Heathrow
Steering colum Electronics:
B116229- Selector lever park position lock switch range/performance.
As @Karollo says, I'm fairly sure that this is related to the 'park position sensor switch'.
 
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