New Year Service Overdue Bug

[RY-Journeyman]

The dealer said it needed to be plugged for it to be fixed, but gave no other details. It could just be a small code change. Mine was booked for several fixes, and it also included two bulletin actions. A software update: IAMWO004241-SP1 UPDATE NAFTA & EU and IAMWO004200 STARTER MOTOR CABLE GASOLINE. The reset in my settings could well have come from that software update.

That software update is an older one -

• Purpose: The update optimizes vehicle software for a specific, small percentage of affected vehicles.
• Intelligent Speed Assistance (ISA): Fixes an issue where the "over speed warning" could be switched off once and stay off after an ignition cycle (applies to North America and Mexico only).
• Fuel System: Resolves a "fuel plausibility issue" where refueling the vehicle could incorrectly trigger the engine warning light.

Nothing about a software fix on the forums yet so at this stage no confirmation yet as to whether Ineos are just resetting the service indicator date or fixing the underlying issue with software.

 

[Clark Kent]

I expect it will be something like this:

https://static.nhtsa.gov/odi/tsbs/2026/MC-11028299-0001.pdf

It did seem to be specific to 1st January 2026 in which case there is no need for a code fix per-se just a one-time value correction.

It's worth keeping an eye on the NHTSA page for Grenadier here:

Vehicle Detail Search - 2024 INEOS GRENADIER | NHTSA

www.nhtsa.gov

 

[Eric]

Do you know if it is simply a service indicator reset or is it a software update to fix the service Indicator error permanently? The email indicates software update but less than 30 minutes seems a bit short for that to occur based on past experience of Ineos updates.

Resetting the service indicator on a rountine oil change only takes a few minutes. My head software update took less than 30 minutes, so a 30 minute update may just be a limited patch and not a full install.

 

[Bayford]

Is this just UK that I received this morning from Ineos or has it been more widely circulated?

SERVICE-UPDATE​

Hi Thomas,​

We would like to sincerely apologise for an issue that occurred at the beginning of the year, when a service warning light appeared on the display of some INEOS Grenadiers showing an incorrect overdue service message. The message was caused by a software bug that incorrectly recalculated the service interval on 1 January 2026, which resulted in the warning being displayed on the console. We would like to emphasise that this is not a recall and does not indicate any fault or safety issue with your vehicle.

In some cases, vehicles were not affected:

• If you have not seen this message: No action is required; please disregard this email. • If you have seen this message: Please contact your retailer to arrange a software update.

The update takes no longer than 30 minutes. To avoid delays, please book your slot in advance rather than arriving without an appointment.

As a thank you for your patience, if you bring your vehicle in for the update between 13th February and 31st May, you are eligible for the following exclusive accessory bundles:

• The Protection & Utility Bundle: Your price: £624 (Includes Rock Sliders or Side Steps, Rubber Floor Mats, Front & Rear Seat Covers, and a Picnic Table - RRP: £2393). • The Essentials Bundle: Your price: £374 (Includes Rubber Floor Mats, Front & Rear Seat Covers, and a Picnic Table - RRP: £1274). • Full Length Roof Rack: Upgrade your storage with a Full-Length Roof Rack for £599 - RRP: £2150.

​

Thank you for your understanding and continued support.

CONTACT A RETAILER ​

 

[Fürst]

Is this just UK that I received this morning from Ineos or has it been more widely circulated?

​

SERVICE-UPDATE​

Hi Thomas,​

We would like to sincerely apologise for an issue that occurred at the beginning of the year, when a service warning light appeared on the display of some INEOS Grenadiers showing an incorrect overdue service message. The message was caused by a software bug that incorrectly recalculated the service interval on 1 January 2026, which resulted in the warning being displayed on the console. We would like to emphasise that this is not a recall and does not indicate any fault or safety issue with your vehicle.

In some cases, vehicles were not affected:

• If you have not seen this message: No action is required; please disregard this email. • If you have seen this message: Please contact your retailer to arrange a software update.

The update takes no longer than 30 minutes. To avoid delays, please book your slot in advance rather than arriving without an appointment.

As a thank you for your patience, if you bring your vehicle in for the update between 13th February and 31st May, you are eligible for the following exclusive accessory bundles:

• The Protection & Utility Bundle: Your price: £624 (Includes Rock Sliders or Side Steps, Rubber Floor Mats, Front & Rear Seat Covers, and a Picnic Table - RRP: £2393). • The Essentials Bundle: Your price: £374 (Includes Rubber Floor Mats, Front & Rear Seat Covers, and a Picnic Table - RRP: £1274). • Full Length Roof Rack: Upgrade your storage with a Full-Length Roof Rack for £599 - RRP: £2150.

​

Thank you for your understanding and continued support.

​ CONTACT A RETAILER ​

Hi! Yes, I received the same in Germany for my IG 2025.

 

[Eric]

Resetting the service indicator on a rountine oil change only takes a few minutes. My head software update took less than 30 minutes, so a 30 minute update may just be a limited patch and not a full install.

Update, just spoke to the dealer, it is only resetting the service indicator, 5 minute job. IA haven't come up with a software update. Reading between the lines looks like they don't know what the issue is/ was or convinced it wouldn't happen next year.

 

[Shippa]

I spoke with the new and only service agent in Western Australia today and booked mine in for the fix for NY26 bug. I was told that it was a software update not just a service interval reset and that it takes about 30 min to install this update.

 

[Eric]

I spoke with the new and only service agent in Western Australia today and booked mine in for the fix for NY26 bug. I was told that it was a software update not just a service interval reset and that it takes about 30 min to install this update.

Calling in on my dealer later today, see if they can clarify what exactly it is. Reset or update

 

[DoubleDoom]

The dealer said it needed to be plugged for it to be fixed, but gave no other details. It could just be a small code change. Mine was booked for several fixes, and it also included two bulletin actions. A software update: IAMWO004241-SP1 UPDATE NAFTA & EU and IAMWO004200 STARTER MOTOR CABLE GASOLINE. The reset in my settings could well have come from that software update.

Strangely, I am getting some different behaviour this morning following the update. I am assuming it is linked to the SP1 update rather than the service bug. When I get in the car now, and turn the key, I get an amber alert: Engage "D", "N" or "R". Never had that before (coming up to two years of owning it). It is repeating on each engine restart. I also had a power socket reset amber message as well as it was completing an update on those. - just mentioning, given we have mixed info on whether it is just a service reset or a software update and whether this is from the SP1 update or something included with the "potential" software update.

 

[Michael H.]

Strangely, I am getting some different behaviour this morning following the update. I am assuming it is linked to the SP1 update rather than the service bug. When I get in the car now, and turn the key, I get an amber alert: Engage "D", "N" or "R". Never had that before (coming up to two years of owning it). It is repeating on each engine restart. I also had a power socket reset amber message as well as it was completing an update on those. - just mentioning, given we have mixed info on whether it is just a service reset or a software update and whether this is from the SP1 update or something included with the "potential" software update.

Have you checked that your EXT-4 overhead switched hasn’t been turned on by mistake?

 

[Eric]

So

Calling in on my dealer later today, see if they can clarify what exactly it is. Reset or update

Sorted, just a matter of semantics. My dealer doesn't see it as an update as such, just a reset of the calculation.

 

[DoubleDoom]

Have you checked that your EXT-4 overhead switched hasn’t been turned on by mistake?

Good call. Just popped out and checked and EXT-4 was on. Thank you.

 

[OkGo]

Just checked and not had any email from Ineos. Did you guys have a fault recorded with them previously on this issue?

 

[Eric]

Just checked and not had any email from Ineos. Did you guys have a fault recorded with them previously on this issue?

No, hadn't been in contact with IA nor the dealer. As soon as the issue hit the forums I just waited. Ineos emailed me direct with notification to contact dealer. Are you registered with Ineos as the original owner or was your vehicle purchased as used, in which case the original owner may have received the email.

 

[Blackwolf]

Just checked and not had any email from Ineos. Did you guys have a fault recorded with them previously on this issue?

I was wondering the same thing. I guess IA know I own mine because I have access to the manuals but, having said that, they keep inviting me to have a test drive.

If I've heard nothing in a week or so I'll contact my dealer.

 

[Grumpy]

I was wondering the same thing. I guess IA know I own mine because I have access to the manuals but, having said that, they keep inviting me to have a test drive.

If I've heard nothing in a week or so I'll contact my dealer.

No fault registered with IA either, just was playing by ear. I wasnt planning on visiting STC until October for the next service either so unless another reason comes up, we'll continue to live with it.

G.

 

[Logsplitter]

I’ve had the email but in no rush to get the fix. I’ll wait until I’m booked in for a service on 30 April for service and MOT.

 

[Cheshire cat]

I popped into my dealership today but only as I was in the area. They will sort my software this Thursday morning. Told me they would only need the car for 30 mins or so.

 

[Happyoldgit]

No email received here either but such is life. Mine went in for door buttons a couple of weeks ago and the tech who did the work said they had been told not to sort the overdue message, fine by me as it's not really a bother to ignore it.

 

[Skydance]

Had the email this morning. Not in a rush to travel 3 hours there and back to the dealers. I thought they were going to push the update over the air to fix, last time I heard. I guess not now.

I’ve got mostly everything on the goodies list except the roof rack. But I never wanted a roof rack because of the inconvenience in getting into car parks with height restrictions.

To be honest, I would rather Ineos as a goodwill gesture give us a voucher towards the next servicing so we can all benefit instead.