 | Home > Faults & Fixes (L663) > 25MY Defender Gearbox Engagement Delay |
 
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| Flinders Member Since: 17 Feb 2024 Location: West Yorkshire Posts: 85  
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‘has anyone with the rolling back or delay issue, had their Defender successfully repaired/updated and the issue sorted out?’
Yes I have ………… by rejecting and getting a replacement! I know not a useful answer but I am so glad I went down this route as they had no solutions and no idea how to resolve, despite my dealer trying so many times. The difference in the replacement D350 is honestly astounding! I now understand why people were raving about how well the defender drove! MY25.5 Defender 90 D350 X Dynamic HSE - Maximus MY25 Defender 90 D350 X Dynamic HSE - Boris - REJECTED 
MY18 Discovery 5 3.0ltr TD6 HSE Lux - Derek |
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30th Apr 2025 9:57am |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5107  
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Mine is a d350. So are you saying your old d350 did it and the new one does not? Mike
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30th Apr 2025 10:25pm |
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| Flinders Member Since: 17 Feb 2024 Location: West Yorkshire Posts: 85
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Yes that’s basically it. Old one - D350 rolled back, had rough, jerky gear changes, noisy and prolonged electric park brake noises, auto stop start never worked correctly and the ventilation system squealed like a pig! New replacement D350 has none of these faults. MY25.5 Defender 90 D350 X Dynamic HSE - Maximus
MY25 Defender 90 D350 X Dynamic HSE - Boris - REJECTED
MY18 Discovery 5 3.0ltr TD6 HSE Lux - Derek |
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30th Apr 2025 10:49pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5107
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Mine doesn’t have any of those faults but the 3 d350s all have the same engagement issues on the latest my Mike
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1st May 2025 6:36pm |
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| discobean Member Since: 06 Jan 2025 Location: Sydney Posts: 12 
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Yes my D350 makes the same hissing sound. Whenever I hear it I just want to burn the car what a piece of junk. |
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2nd May 2025 2:46am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 3232
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Hardly a "piece of junk" because of that. lf the engine blew up,
it would be more justifiable statement. l don't get any hissing noises from my D250 diesel though, maybe it's the air suspension making the noise (l don't have air suspension either) |
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2nd May 2025 5:14pm |
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| ruben Member Since: 04 Feb 2021 Location: ASTURIAS Posts: 349 
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I speak for myself, my D250 from MY 23.5 doesn’t make any kind of blowing or whistling noise, and it has air suspension…if you find yourself in a garage, or a tunnel, with no music and in absolute silence, windows down and close to a wall or another car, you can feel the slight action of the handbrake when it comes on, or the servo control of the gear change when you shift into D from N for example…and if you strain your ears really hard you can hear, or sense, the compressor in the distance if, in that state of silence, it decides to act…that said, I can say that all those elements were much more audible in my D3, by far, without going any further…so by no means, at all, would I define the Defender as a piece of junk… Defender 110 SE I6 D250 23MY
ExDiscovery 3 TDV6 SE |
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2nd May 2025 5:29pm |
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| discobean Member Since: 06 Jan 2025 Location: Sydney Posts: 12
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No the noise is the gearbox changing from neutral to drive. You can hear it in the video. You can even hear it when you shift from park to drive. It is nothing to do with the brakes etc.
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4th May 2025 9:46am |
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| Sockeye Member Since: 15 Feb 2023 Location: Brisbane Posts: 15
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I concur.
The hissing sound comes from the transmission selector area. It is minor and jenerally does not bother me too much. However, the acceleration jerk is  me off indeed. |
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4th May 2025 10:06am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 3232
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I've had two diesel vehicles from new. The Defender and a Ford van. Both vehicles suffered from a sudden surge of acceleration a couple of seconds after trying to start
from standstill. On the Ford van it was downright dangerous, you'd try to merge into a line of traffic and nothing would happen, then it was as if you'd been hit from behind it took off like a rocket. Over time the effect diminished but it took a few thousand miles. On my Defender it was around 4,000 miles before it became smoother. lt's fine now. |
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4th May 2025 8:57pm |
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| discobean Member Since: 06 Jan 2025 Location: Sydney Posts: 12
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Yes the hissing wouldn't bother me too if it didn't jerk and roll back.. The hissing is another reminder that there is this issue, and that's what I don't like about it the most. It wouldn't hiss if it wouldn't go into neutral. |
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5th May 2025 12:32am |
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| LandyLover1107 Member Since: 23 Dec 2024 Location: NA Posts: 13 
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Hi everyone.
Just thought I would provide an update/bump to this topic. It's currently a topic under "Faults & Fixes" with the most views and replies in a long time - indicating that this is definitely a widespread issue, at least in my opinion. It's interesting that Lightning states that the replacement car does not have the fault anymore. I drove a new 25.5MY Defender D350 recently that was PDI'd last week and it still has the exact same issues all of us are talking about. I am yet to drive a 25MY and later Defender that does not have the problem. If Lightning's car doesn't do it, this is good news but also confusing because why are all the others that are coming out still doing it? I'm also hearing increasing reports from owners of new Defenders booking their cars into the workshops to diagnose this. Surely JLR cannot be ignoring this anymore? There is absolutely no technical bulletin whatsoever on this matter. Either JLR engineers cannot find a fix for it, or they've determined the fix will be too costly and are ignoring the matter until the next models (26MY) arrive without the problem and the 25MY issue gets watered down over time. I don't want to believe the latter as it doesn't seem to be their style, but it's impossible that with the amount of chatter on this issue, it has not reached so far as JLR UK. Surely there must be at least 1 JLR employee with a company car or during testing or whatever that has picked it up and reported it. Anybody out there with a positive update? |
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23rd May 2025 12:39pm |
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| Sockeye Member Since: 15 Feb 2023 Location: Brisbane Posts: 15
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No update, but I can assure you that my dealer has forwarded my complain all the way up to the person in charge of the Defender division.
Plus, I went on to document with dealer this issue and overall sloppy performance of the transmission at low speeds on cruse control. It drives like , there is simply no other term to describe it. |
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23rd May 2025 12:48pm |
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| LandyLover1107 Member Since: 23 Dec 2024 Location: NA Posts: 13
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Good to know Sockeye. It does feel like the gearbox just isn't tuned correctly. Another thing that happens occasionally is right before coming to a complete standstill there would be an audible (and disturbing!) "clunk" from the driveshaft/gearbox. This is being talked about in another section of this website so I won't go into too much detail
Where is the quality control? I know some people don't even notice the roll back issue, but come on! JLR's highest trained and experienced techs and test drivers can't pick up on it? Nonsense. Drive one of the first D300's that came out back in 2021 and even the most recent 24MY - it is buttery-smooth and refined. Then jump into the 25MY and it just feels sloppy. They're going backwards (quite literally). |
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23rd May 2025 2:21pm |
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