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?