WenmarOpen by Wenmar Pro

Service bulletin IATSB004513

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id11037976
Published by NHTSA2026-10-05
Manufacturer's numberIATSB004513
Manufacturer's date2026-09-15
NHTSA componentELECTRICAL SYSTEM
Manufacturer's systemBattery: 9M Battery & Power Sockets

NHTSA's summary

Battery failures caused by sulfation due to charging voltages being lower than the specified optimum values under certain operating temperature conditions

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Electrical system

Vehicles listed
INEOS GRENADIER2024, 2025, 2026
INEOS GRENADIER QUARTERMASTER2024, 2025, 2026 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
23V8280002023-12-07. ELECTRICAL SYSTEM:WIRING

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
IATSB004512v42026-09-07. Service bulletin. The HVAC only providing hot air through vents when cold air has been selected
SSM 622 Service Warning2026-02-05. Service bulletin. Update instructions for resetting the service warning message.
SSM 617 ISA Incorrect2026-02-04. Service bulletin. Diagnostic notes for Intelligent Speed Assist warning error.
IAMWO0042512025-07-05. Service campaign. An issue has been identified where the Intelligent Speed Assistance functionality does not fit with customer expectations. Intelligent Speed Assistance (ISA) can now be toggled to remain off after ignition cycle
IAMWO004200v22025-06-03. Service bulletin. An issue has been identified on a small percentage of the affected vehicles where the starter motor cable could come into contact with the engine mount.
IAMWO0030352024-07-01. Service campaign. Issue: An issue has been identified on a small percentage of the affected vehicles where the trailer turn signal tell tail light does not operate on the dashboard.
IAMWO0030252024-07-01. Service campaign. A software issue has been identified on a small percentage of the affected vehicles where the vehicle engine stop/start system does not operate.
IAMWO0026692024-05-07. Service bulletin. Installation instructions for a new protection cap on the positive terminal of the auxiliary battery. An issue has been identified on a small number of the affected vehicles where the auxiliary battery may be at risk of a short circuit.
IAMWO003002v22024-04-06. Service bulletin. An issue has been identified on a small percentage of the affected vehicles where the vehicle requires the correction of previous software to enable the Towing Electronics functionality.