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Old Aug 1st 2019, 11:34 PM   #1
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Question Help needed - problem with gear position sensor and DQS (Ducati V4 2018)

Hello fellow Ducatisti.

I have a Ducati V4 1103cc, 2018. The bike now has 1300 miles on it. It is an amazing bike. I use it as a track bike. The first impressions were amazing, and I had several track days without any problems.

However, after a recall, in which the dealer changed the radiator and the clutch cable, a strange problem manifested itself - the bike loses the gear position after 1/2 lap and disables the DQS and most of the rider aids.

The bike has been to the dealer twice since this happened. They said they have reset the ECU and that should fix the problem. However, the problem persists and it is really annoying, since I can establish that only once I am already at the circuit. What makes the problem even more bizarre is that while the bike is cold everything works normally, but once it gets hot (again - 1/2 lap) - no gear position info. After a 3-4 hour rest - the bike seems to find the gears, and again - when it gets hot - nothing.

What makes it even more bizarre is that I stripped a sensor from a friend's bike - it worked for a day, and afterwards it started to behave like my old sensor.

I checked the Service Manual, and it seems there are three cable running from the ECU to the gear position indicator - a 5V source (pin 18, which besides the gear position sensor also powers the side stand switch hall sensor and the quick shifter), signal cable (pin 59) and gear ground (pin 76). It seems that everything is intact with the 5V source signal. I do not know how to measure the signal (I would guess you need an oscilloscope for this).

I wrote to people working with Ducati parts, and there seems to be a part number change for the gear position sensor. The previous part number was 55243521A and the new part number is 55243522A. My bike seems to have the latter.

Now, after all this - does anyone have an idea what the problem might be or what to look for before ordering a new sensor?

Thanks guys!
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Old Aug 2nd 2019, 12:12 AM   #2
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Are you using a sidestand delete plug? Stock QS or aftermarket? If either or both, you need to eliminate these possibilities since they are on the same 5v circuit.
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Old Aug 2nd 2019, 06:36 AM   #3
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My 1199S did something similar with the brass sensor located on the transmission that feeds info to the computer for gear position. On the 1199 the sensor is right below the exhaust loop so heat is most likely the culprit.

On the V4 I am not sure but as GunMoto mentions, you should eliminate the potential source of interference by replacing/ checking the impact those connections potentially have on that circuit.
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Old Aug 2nd 2019, 02:41 PM   #4
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Originally Posted by GunMoto View Post
Are you using a sidestand delete plug? Stock QS or aftermarket? If either or both, you need to eliminate these possibilities since they are on the same 5v circuit.
Hello GunMoto. Thank you for your response. No, I am not using a side-stand delete - the stand is still there. The QS is the stock one. They are both working, so it seems it is not the circuit. Do you have any other ideas?

Originally Posted by JHTmcrider View Post
My 1199S did something similar with the brass sensor located on the transmission that feeds info to the computer for gear position. On the 1199 the sensor is right below the exhaust loop so heat is most likely the culprit.

On the V4 I am not sure but as GunMoto mentions, you should eliminate the potential source of interference by replacing/ checking the impact those connections potentially have on that circuit.
Hello JHTmcrider, thank you for your response. Yes, the problem seems to be exactly as on your 1199S - the ECU does not get gear information, and disables the DQS and the other rider aids. On the V4 the sensor is on the opposite side of the exhaust and is a hall-effect sensor. But while I was removing the second sensor from a friend's bike to try it I noticed two small spacers behind the sensor that were missing on my bike. I am almost ready to blame this for the possible sensor failure and buy a new sensor and fit spacers to let some of the heat dissipate between the sensor and the gearbox. I just wanted to check with you guys if anyone has had a similar issue and probably knows something more about the issue / possible problem with the bike.
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Old Aug 4th 2019, 04:30 PM   #5
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Iím having the exact same issue. Started after a HOT track day and when my mechanic reset everything it ran normally until I hit the track again. Once warmed up, the dash lit up, gear selector just showed a dash. It temporarily went back to normal when we changed some traction control settings and turned the key off/on a few times, but once I went back out on the track the dash lit right back up and the gear selector went away. The first couple of times my QS and autoblipper worked, but this most recent time, nothing worked. Please keep me posted. This is ridiculous.
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Old Aug 4th 2019, 04:54 PM   #6
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The 1299 has a gear teach procedure and likely the same in the V4. I believe in the procedure you need the engine casing to achieve a certain temperature. I found a forum thread showing the procedure but for the 1299:

Gear Teach procedure
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Old Aug 4th 2019, 06:33 PM   #7
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Originally Posted by airjawed View Post
The 1299 has a gear teach procedure and likely the same in the V4. I believe in the procedure you need the engine casing to achieve a certain temperature. I found a forum thread showing the procedure but for the 1299:

Gear Teach procedure
I hadnít heard of this. Was the gear teach procedure developed because of symptoms weíre experiencing?
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Old Aug 5th 2019, 07:06 AM   #8
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Originally Posted by Bai Mityo View Post
Hello GunMoto. Thank you for your response. No, I am not using a side-stand delete - the stand is still there. The QS is the stock one. They are both working, so it seems it is not the circuit. Do you have any other ideas?



Hello JHTmcrider, thank you for your response. Yes, the problem seems to be exactly as on your 1199S - the ECU does not get gear information, and disables the DQS and the other rider aids. On the V4 the sensor is on the opposite side of the exhaust and is a hall-effect sensor. But while I was removing the second sensor from a friend's bike to try it I noticed two small spacers behind the sensor that were missing on my bike. I am almost ready to blame this for the possible sensor failure and buy a new sensor and fit spacers to let some of the heat dissipate between the sensor and the gearbox. I just wanted to check with you guys if anyone has had a similar issue and probably knows something more about the issue / possible problem with the bike.
What model bike was your friend's with the spacers?
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Old Aug 7th 2019, 06:26 AM   #9
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Originally Posted by airjawed View Post
The 1299 has a gear teach procedure and likely the same in the V4. I believe in the procedure you need the engine casing to achieve a certain temperature. I found a forum thread showing

the procedure but for the 1299:

Gear Teach procedure
Thank you for this, airjawed. I have done the gear teach procedure, but I am not sure if I did it with the engine warmed up enough. The dealership definitely has not heard of this. I will try it and post

feedback.

Originally Posted by rja4z3 View Post
What model bike was your friend's with the spacers?
Hello, rja4z3. I am not 100% sure, but I will get this information and post it for reference when people keep searching for this.
Also, you having the same issue is somewhat soothing for me - that means that I am not the only one and there might be something from Ducati after all.

I was wondering - did you take it to the dealership? If so - what did they say?

I will keep the topic alive - hopefully with a solution.
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Old Aug 9th 2019, 10:06 AM   #10
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I’ve just had the same issues on my V4S,
Was out for a ride and the Side stand sensor went to shit, lost drive and wouldn’t drive in gear again as it thought the side stand was down when it wasn’t....
Next I know when it was sitting in the garage, I turned ignition on and the gear indicator on the dash has gone to shit and just showed ‘-‘
As above these sensors are on the 5v loop so maybe related issues?
Bike is currently at the dealer.
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