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