Lagging accel pedal?

Discussion in 'Discovery 5' started by Groucho123, Oct 27, 2018.

  1. Groucho123

    Groucho123 Member

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    I've read about this common problem (I have it too) and I have seen people take theirs in for some sort of software update. To be clear, my issue is when I slow down and then accelerate (before coming to a complete stop), my accelerator is very slow to respond. Did this fix completely resolve the issue or only make it slightly better?
     
  2. Groucho123

    Groucho123 Member

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    FYI to those who have the issue, I learned from another forum...There IS a service bulletin on this, and there is a software fix due early next year. They are testing to comply with emisions reg's in the US
     
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  3. PaulLR3

    PaulLR3 Full Access Member

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    ZF transmissions have had this issue for years. If you do a rolling stop you catch the transmission doing a second to first gear downshift. Then you suddenly ask it to go and there is that delay.
     
  4. remember5

    remember5 Full Access Member

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    My LR3 does that same lag thing and I was just about to replace the accelerator position sensor to see if it improves throttle response. I had no idea it was the transmission. Thanks!
     
  5. toddjb122

    toddjb122 Full Access Member

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    This is hysterical! My LR3 did this, my LR4 does this (but not as bad)... it's very annoying. I have found if I put either of those in Sport mode, it goes away for the most part. There is much less of a throttle lag. Actually, I'm not sure if my LR4 does this or not... I always drive in Sport mode because I like the throttle response much better.

    I'm not sure if you are talking about the same thing, but it sounds exactly like it. Vehicle slows down, but doesn't stop... you hit the gas, there's a second or two delay and then BAM, it catches the downshift with a thud.

    Try Sport mode and let us know if it goes away.
     
  6. Groucho123

    Groucho123 Member

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    I don't think it is a shift issue, It would def be 1st. gear...going from a rolling 1 or 2 mph to normal drive it is an engine lag....However someone else on another forum wrote this....
    Reference
    SSM73409
    Discovery / L462
    LR3 / L319
    Range Rover / L322 Range Rover / L405 Range Rover Sport / L494
    Land Rover 8 Speed Automatic Transmission
    Driveline
    21-Mar-2018 00:00:00
    503000 Automatic Transmission Engagement Concerns
    Issue:
    Powertrain Transmission Module Learn Adaption routine has been instated on SDD/Pathfinder.
    Cause:
    The routines have been installed after enhancements were made to each, following feedback from the market, as of Version 152 Patch 2
    Action:
    Should a customer contact a retailer regarding Automatic Transmission shift quality on 8 Speed variants, please follow the routine below in the first instance after fully understanding and confirming the customer concern.
    1.Ensure Transmission and other relevant Powertrain control modules are at the latest software level available.
    2.If there are any DTC’s read by the diagnostic tool, resolve them, before proceeding.
    3.Using the routine, “Powertrain – Transmission control module adaptions”, ensure that all the clutches have at least 3
    adaption counts.
    4.If any of the clutches have less than 3 adaption counts, carry out an adaption drive cycle using, “Powertrain Transmission Module Learn Adaption” to achieve a minimum of 3 counts on each clutch.
    5. If the shift quality concern is still present carry out an adaption drive cycle using, “Powertrain Transmission Module Pulse Adaption” routine to achieve a minimum count of 3 on each.
    5.If all the clutches have at least 3 adaption counts and all Powertrain modules have the latest software, should there still be a shift quality concern, raise a TA, with a screen shot of your adaption status. The TA will advise further help in order to resolve the issue
    You may also be asked to provide the session file detailing
    “Powertrain – Transmission control module adaption” routine.
    Models
     
  7. NoBo Disco

    NoBo Disco New Member

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    So, has anyone successfully gotten the acceleration lag issue corrected?
     
  8. GM99

    GM99 New Member

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    I am interested in knowing as well. It is a little unsettling when you go to change lanes and don't have any power when pressing the gas until a few seconds later. It would be nice to know if there is a fix before taking it in to the dealer.
     

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