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GAP IID Tool Summary

Old Nov 13, 2025 | 09:44 AM
  #561  
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Originally Posted by manu
I have the same issue as you on my MY21 model using the larger screen upgrade.

I can get rid of the placeholder message by changing the CCF on EUCD-229 Model Year
 to anything above "2021 3/4" (when the larger touch screen was introduced) but that creates the emergency breaking fault.

I had to revert EUCD-229 Model Year 
2021.
Got it, was hoping OEM would work, it’s minimal but I don’t like having the missing images and the placeholder. Ended up ordering the WIMAFUN AliExpress kit to swap out the screen to retain all features and images. I will have the oem screen and powerfuluk bracket and harness adapter for sale shortly if anyone wants it with a 22 or newer I guess so it doesn’t have missing things.

Also got my matrix headlights in, will be fitting and coding them today and posted my factory premium LED headlights for sale. Really looking forward to the bending lamps as we’ve had in VW/Audi/Porsche vehicles, sounds insignificant but is such a huge help driving at night to illuminate around corners instead of straight ahead, that was probably one of the biggest letdowns the first time I drove the defender at night, I didn’t realize they didn’t have the option.



 
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Old Nov 14, 2025 | 10:02 PM
  #562  
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Finally took the plunge and got the G4 GAP tool. First thing I wanted was ACC so proceeded as per this thread. All went as expected, after making the update got the Emergency Braking disabled thing but after cycling a couple times it went away. So out and about I went to test it. Seemed to be working as expected when all of a sudden I got this message (full disclosure the photo is taken from a post by @nashvegas in another thread as I did not think about taking a picture!). After that it told me adaptive mode was not available. Stopped turned off engine got out and closed and waited a couple mins. Then jumped back in and started again. System was back working but after a little while same thing. This same routine happened a couple more times, so I put the GAP tool to good use and decided to read and log live values for the cruise control sensor state. The log shows that it starts as “sensor fully operational within specification” and then after about 90 seconds of the ACC being activated the message on the dash comes and the sensor status changes to “sensor blindness detected”. So seems to be a hardware issue.The car is pretty clean and there was no rain, snow or mud involved (also no warning or faults of any kind other than the one in the picture, and no warning for emergency braking which as I understand it uses the same module). I will throughly clean the badge and housing tomorrow and check for anything that could be obstructing it (I did do a winch installation a few months ago which implied removing the radar), but was curious if anyone experienced this. My guess is the issue has been there for a while but since I did not have ACC it wasn’t noticeable (though I still think Emergency Braking should be showing a warning if the module is having issues).

Related to this, I also figured it might be worthwhile doing a Radar calibration via the Service/Test function of GAP IID, but when I tried to do so I kept getting an “operation failed” error. Curious if anyone here has successfully performed a radar calibration with the tool (I was able to confirm via live values that the horizontal and vertical angles of the radar are within specification, but still think it would be good to perform a calibration since I had removed the radar).

With all this said I am so far pretty fascinated with the tool and what it enables.

 

Last edited by Juancl; Nov 14, 2025 at 10:46 PM.
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Old Nov 15, 2025 | 01:22 AM
  #563  
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I believe when I took that photo it was icy conditions when I was driving back from a ski town (?) and there was a ton of rain or slush on the front of the vehicle, although I could be wrong. Either way, since then, that is the only time it has happened. I too, btw, have a winch and associated setup on the front of mine although mine came from factory with ACC.

It does sound like the sensor behind that LR badge thinks it “can’t see” based on what you say, doesn’t it? You’re sure there’s not a wiring issue with that connector right? I bodged and had to re-pin my connector to that sensor (it was a complete nightmare actually) -- I broke the connector when unhooking it to install my winch, and one of the wires came out and was loose. A loose wire could cause the issue you’re having. That connector is to as easy as you’d think. Mine was very difficult to unseat properly. As a final question, do you have any kind of bull bar or lights up there? Just curious. ‘

BTW I have not recalibrated the radar sensor with Gaptool. Did not know you could do that. @CincyRovers said he had it done at the dealership - is that right?
 
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Old Nov 15, 2025 | 01:26 AM
  #564  
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Originally Posted by nashvegas
I believe when I took that photo it was icy conditions when I was driving back from a ski town (?) and there was a ton of rain or slush on the front of the vehicle, although I could be wrong. Either way, since then, that is the only time it has happened. I too, btw, have a winch and associated setup on the front of mine although mine came from factory with ACC.

It does sound like the sensor behind that LR badge thinks it “can’t see” based on what you say, doesn’t it? You’re sure there’s not a wiring issue with that connector right? I bodged and had to re-pin my connector to that sensor (it was a complete nightmare actually) -- I broke the connector when unhooking it to install my winch, and one of the wires came out and was loose. A loose wire could cause the issue you’re having. That connector is to as easy as you’d think. Mine was very difficult to unseat properly. As a final question, do you have any kind of bull bar or lights up there? Just curious. ‘

BTW I have not recalibrated the radar sensor with Gaptool. Did not know you could do that. @CincyRovers said he had it done at the dealership - is that right?
@nashvegas

i discovered the calibration steps in the shop manual the other day by pure chance looking at other stuff.

as far as I can tell all the steps to calibrate are GAP tool doable.
 
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Old Nov 15, 2025 | 06:00 AM
  #565  
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Originally Posted by GavinC
@nashvegas

i discovered the calibration steps in the shop manual the other day by pure chance looking at other stuff.

as far as I can tell all the steps to calibrate are GAP tool doable.
I found the radar calibration function in the GAP tool manual. The notes are identical as what is stated on the LR workshop manual.


 
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Old Nov 15, 2025 | 06:03 AM
  #566  
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Originally Posted by nashvegas
I believe when I took that photo it was icy conditions when I was driving back from a ski town (?) and there was a ton of rain or slush on the front of the vehicle, although I could be wrong. Either way, since then, that is the only time it has happened. I too, btw, have a winch and associated setup on the front of mine although mine came from factory with ACC.

It does sound like the sensor behind that LR badge thinks it “can’t see” based on what you say, doesn’t it? You’re sure there’s not a wiring issue with that connector right? I bodged and had to re-pin my connector to that sensor (it was a complete nightmare actually) -- I broke the connector when unhooking it to install my winch, and one of the wires came out and was loose. A loose wire could cause the issue you’re having. That connector is to as easy as you’d think. Mine was very difficult to unseat properly. As a final question, do you have any kind of bull bar or lights up there? Just curious. ‘

BTW I have not recalibrated the radar sensor with Gaptool. Did not know you could do that. @CincyRovers said he had it done at the dealership - is that right?
Yep, wiring is on my list of things to check. I do not recall having issues with that connector when I did the winch installation, but will be checking it anyway. no bull or light bars, just the OEM winch setup.

Will report back after spending some time on this over the weekend.
 

Last edited by Juancl; Nov 15, 2025 at 06:07 AM.
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Old Nov 15, 2025 | 03:59 PM
  #567  
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Hello fellow Defender owners who are more adventurous and smarter than me,
I have one question. So far, I'm enjoying all codings that GAP tool provides but I'm wondering if I can code off road cruise control (not adaptive cruise control) enable on my almost fully loaded 2023 P400 with all off road options (hill decent/air sus/TR). Please let me know if you know the answer. Thanks!

 

Last edited by isugoo; Nov 15, 2025 at 04:03 PM.
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Old Nov 17, 2025 | 09:09 AM
  #568  
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Originally Posted by isugoo
Hello fellow Defender owners who are more adventurous and smarter than me,
I have one question. So far, I'm enjoying all codings that GAP tool provides but I'm wondering if I can code off road cruise control (not adaptive cruise control) enable on my almost fully loaded 2023 P400 with all off road options (hill decent/air sus/TR). Please let me know if you know the answer. Thanks!
Maybe. It is a new feature in the LR world, and debuted on the L461 RRS, and new for the Defender for the 26MY. I highly doubt that there would be any new hardware required, but I'm not sure if GAP supports it, or if it is even available to activate in older models. Would be best to contact the good folks at GAP, as well as reaching out to Simon Jefferson at Powerful UK - he always seems to find the answer.
 
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Old Nov 17, 2025 | 09:55 AM
  #569  
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My Defender uses ATPC. It can be useful. This is part of the advanced off-road pack which is essentially TR2. That can be activated with GAP. In newer years they have broken the pack up AFAIK and now offer the ATPC or off-road CC as a stand alone option. I think it's simply new labeling. Maybe there is some slight software change. . This icon is not on mine. ATPC icon is green.

Activate TR2 and you'll have what you need. I'm not seeing what this does that ATPC does not.
 

Last edited by GavinC; Nov 17, 2025 at 09:57 AM.
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Old Nov 17, 2025 | 10:57 AM
  #570  
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Originally Posted by GavinC
My Defender uses ATPC. It can be useful. This is part of the advanced off-road pack which is essentially TR2. That can be activated with GAP. In newer years they have broken the pack up AFAIK and now offer the ATPC or off-road CC as a stand alone option. I think it's simply new labeling. Maybe there is some slight software change. . This icon is not on mine. ATPC icon is green.

Activate TR2 and you'll have what you need. I'm not seeing what this does that ATPC does not.
Off-road ACC is basically automatic ATPC. You set the speed, and if the car senses there is an obstacle or rough terrain ahead, it will automatically slow down, get through the obstacle, and speed back up to the selected speed. You can also turn the adaptive feature off, and it will act the same as ATPC. I tried it on the new RRS around a pre-set course and it worked astonishingly well. Better than ATPC.
 
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