After you install an Engine Immobilizer and configure immobilizer settings, you can monitor immobilizer state and tampering activity from several locations in the Samsara dashboard. Fleet administrators and security teams use these indicators to confirm that relays respond to remote commands, that automatic immobilization triggers as expected, and that tampering events are visible for investigation.
Tampering detection is an optional sensor on HW-EI21 Engine Immobilizer hardware. A magnet-actuated tamper detector trips when the dashboard cover or protective component is removed, typically before someone can reach the Vehicle Gateway. The immobilizer reports tampered status to the Vehicle Gateway. You can notify your team with a Tampering Detected automation or legacy alert, automatically immobilize the vehicle by enabling the Tampering event trigger in immobilizer settings (Mexico only), or use both—these responses are independent. Immobilizer controls and tampering indicators display when the vehicle has a connected Engine Immobilizer and your organization has an Engine Immobilizer license. Tampering indicators require an installed tamper detector. To configure automatic immobilization triggers, see Configure Engine Immobilizer Settings.
Open a vehicle from Fleet > Overview (or select the vehicle on the Fleet Overview map) to review immobilizer status for that asset.
The Immobilizer section on the vehicle page summarizes relay state and any active immobilization warnings. Each configured relay (Relay 1, Relay 2, or custom relay names) lists an Immobilize or Remobilize control depending on whether that relay is open or closed. Select the section title to open the Immobilization Report filtered to that vehicle.
To immobilize or remobilize a vehicle, see Immobilize a Vehicle.
While an immobilization request is in progress or the vehicle is disabled, warning banners display at the top of the vehicle page and in the Immobilizer section. Vehicle-level banners include:
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Vehicle is disabled: The immobilizer has disabled the starter line and the vehicle cannot start.
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Vehicle will be disabled once turned off: You requested immobilization while the vehicle was still running. The immobilizer engages after the engine stops.
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Please wait. Disabling this vehicle... or Please wait. Enabling this vehicle...: The Vehicle Gateway received the command and the relay is switching state.
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Vehicle will be disabled when gateway returns online or Vehicle will be enabled when gateway returns online: The Vehicle Gateway is offline. The command is queued until the gateway reconnects.
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Vehicle is disabled on tampering: Automatic immobilization engaged because tampering was detected on the immobilizer hardware.
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Vehicle is disabled on jamming: Automatic immobilization engaged because a jamming event exceeded your configured duration threshold.
Relay-level banners in the Immobilizer section name the affected relay (for example, Starter or Accelerator when custom relay names are configured). Additional relay banners include:
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Please wait. Disabling [relay name]... or Please wait. Enabling [relay name]...: The relay command is in progress.
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[Relay name] will be disabled when gateway returns online or [Relay name] will be enabled when gateway returns online: The Vehicle Gateway is offline and the relay change is queued.
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Immobilization in progress. [Relay name] will be disabled when the vehicle speed goes below [speed threshold]: The vehicle is above the configured immobilization speed threshold. The relay opens after the vehicle slows down. Some pending changes include a Cancel immobilization or Cancel mobilization action.
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[Relay name] will be automatically disabled when the vehicle speed goes below [speed threshold]. Immobilization cannot be canceled: Automatic immobilization is pending and cannot be canceled from the dashboard.
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Auto immobilization is disabled because vehicle is outside of Mexico: Automatic immobilization cannot complete because the vehicle is outside the supported region.
Note
Remote immobilization commands can take up to 30 seconds to reach the device. Status banners can take an additional few seconds to update after the relay changes state.
For field definitions and fleet-wide immobilization history, see the Immobilization Report.
On Settings > Devices > Configuration > Immobilizer, a fleet-wide status banner displays below the Tampering event trigger after you configure immobilizer settings:
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A success banner with the message In the past 24 hours, your fleet had no tampered vehicles. when no tampering events occurred in the past 24 hours.
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An error banner with the message In the past 24 hours, your fleet had [count] vehicles with at least one tampering event, and currently, [count] vehicles are marked as tampered with. when tampering occurred in the past 24 hours or vehicles are currently marked as tampered.
To confirm a tamper detector is installed correctly on a specific vehicle, open that vehicle page and verify that no tampering banner is active. After you reinstall the removable tamper component, tampering indications should clear when the circuit is intact again.
Note
While tampering is active, you cannot remobilize the vehicle from the dashboard until the tamper detector circuit is restored.
You can notify your team when tampering is detected on Engine Immobilizer hardware by creating an Automations workflow with the Tampering Detected trigger (Security category). You can also use the legacy v2 Tampering Detected alert. Supported actions include email, SMS, push notification, and a dashboard banner that remains on screen until dismissed.
When a configured notification is active for a vehicle, a security banner on the vehicle page summarizes the incident (for example, Tampering detected) with Details or Disable Vehicle actions when immobilization is available for that asset.
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