Diagnostic, Malfunction, and Sensor Alerts

Drivers may see various diagnostic, malfunction, and sensor alerts as part of the mobile's boot-up process or during operation. You can help your drivers troubleshoot these issues using the following procedures or print this page and distribute it to your fleet.

Be aware that any malfunction or alert that is not resolved for eight consecutive days makes your vehicle out of compliance and cannot be used over-the-road.

Compliance Area	Diagnostics	Malfunction	Possible Cause	Suggested Action
Power	A Power Data Diagnostic event occurs when: an ELD is not powered and fully functional within one minute of the vehicle’s engine receiving power an ELD does not remain powered for as long as the vehicle’s engine stays powered	The ELD Mandate constitutes an aggregate time of 30 minutes of in-motion time over a DOT Day to be a power compliance malfunction. A Power Compliance Malfunction occurs when there is a gap of 15 miles or more between odometer readings taken at power compliance diagnostic logged and cleared events (the unit uses a mileage gap to determine the 30 minutes of in motion time specified by the ELD). This will be indicated on the driver's log. The Power Compliance Malfunction is cleared at the end of the DOT Day (midnight). This will be indicated on the driver's log.	Diagnostic This can occur if the unit does not power up within a one minute of the vehicle powering up. This can occur if the unit has sudden power loss while the vehicle is in motion. Malfunction This can occur if the unit loses power for 30 minutes of in-motion time or more. (15 miles or more of unaccounted driving time)	Diagnostic Wait for unit to power up. (1 minute) Ensure unit is securely connected at the vehicle connection point. Malfunction The driver should then keep a paper log until the driver logs out from the vehicle or the end of the DOT day (whichever comes first). Ensure unit is securely connected at the vehicle connection point. Follow recommended mounting procedures. Check battery/voltage. If problem persists, contact your administrator or call support.
Engine Synchronization	An Engine Synchronization Data Diagnostic event occurs when the ELD attempts to create an event, but is not able to monitor the data from the ECM or populate all of the required fields for the event within a specified time. If the ELD is unable to monitor engine power status, vehicle motion status, miles driven, or engine hours, an engine synchronization data diagnostic event is created.	An Engine Synchronization Compliance Malfunction occurs when more than 30 minutes have accumulated during the log day without ECM connectivity to any of the required data sources (engine power status, vehicle motion status, miles driven, and engine hours). The Engine Synchronization Compliance Malfunction is cleared at the end of the DOT Day (midnight). This will be indicated on the driver's log.	Diagnostic This can occur when the unit is incorrectly connected to the ECM. The unit did not receive engine power status, vehicle motion status, miles driven within a specified time. Malfunction This can occur when the unit is incorrectly connected to the ECM. This unit could not retrieve an aggregated 30 minutes of engine power status, vehicle motion status, miles driven, or engine hours within a specified time.	Diagnostic Wait for unit to receive respective information from ECM. ( 3 minutes) Ensure unit is correctly connected to the tractor's ECM. Ensure that correct cable is used for vehicle type. Malfunction The driver should keep a paper log until the driver logs out from the vehicle or the end of the DOT day (whichever comes first). Ensure unit is correctly connected to the tractor's ECM Ensure that correct cable is used for vehicle type. If problem persists, contact your administrator or call support.
Data Recording	NA	A Data Recording Compliance Malfunction occurs once the unit cannot or does not record or retain required events or retrieve logs that are not available via the Host component or the motor carrier. This can also occur if the ELD unit unexpectedly crashed and has potential Hours of Service data loss. The Data Recording Compliance Malfunction is cleared at the end of the DOT Day (midnight). This will be indicated on the driver's log.	Malfunction This can occur if the unit is low on memory/storage.	Malfunction The driver should keep a paper log until the driver disassociates from the vehicle or the end of the DOT day (whichever comes first). Log out of the unit. Look into system for CPU/Memory and run Diagnostics Call support for NVRAM reset. If problem persists, contact your administrator or call support.
Missing Data Diagnostic	A Missing Required Data Elements Data Diagnostic event occurs when the ELD attempts to create an event, but one or more of the required data fields is missing at the time of its recording. The missing data element is displayed as "N/A" in the driver's log event list.		Diagnostic This can occur if the unit is unable to retrieve correct data from the ECM. If there is engine sync diagnostic event or position malfunction event, there is a possibility of multiple missing data diagnostic events. Reasons - missing engine hours, odometer, latitude, longitude.	Diagnostic Ensure all appropriate driver and load information is entered into the system. Ensure unit is retrieving information from the ECM. Check the unit's communication. Try TIU reset on IVG.
Data Transfer	A data transfer data diagnostic event occurs when the eRODS file generation automatic self test, that occurs every 7 days, fails to generate a file. When a diagnostic is created, the self test frequency increases to once every 24 hours (as long as a driver is logged in).	A data transfer compliance malfunction occurs when the eRODS file generation automatic self test, that occurs every 24 hours, fails to generate a file 3 times in succession. The malfunction is cleared when the eRODS file generation automatic self test can generate a valid eRODS file.	Diagnostic This can occur if the unit is lacking communication to server. Malfunction: This can occur if the unit is lacking communication to server.	Diagnostic Do a manual eRODS Test. Check the unit's communication. Request Out-of-Sync command. Keep in mind that it will log out the driver. Malfunction The driver should keep a paper log until the driver logs out from the vehicle or the end of the DOT day (whichever comes first). Do a manual eRODS Test. Check the unit's communication. Request Out-of-Sync command. Keep in mind that it will log out the driver. If problem persists, contact your administrator or call support.
Unidentified Driving Time	An unidentified driving records data diagnostic event occurs when more than 30 minutes of driving time for an unidentified driver is recorded for the current vehicle within the current log day or during any of the previous 7 days. The diagnostic is cleared when the driving time recorded for an unidentified driver for the current vehicle falls below 15 minutes within the current log day and any of the previous 7 days.	NA	Diagnostic This occurs when the driver forgets to log in.	Diagnostic Log into device. Address necessary unidentified driving segments. If problem persists, contact your administrator.
Position	NA	A Position Compliance Malfunction occurs when the unit GPS fails to acquire a valid position within 5 miles of the vehicle moving and 60 minutes of movement has been recorded during the current log day without a valid location. Keep in mind that if driver moves vehicle in such state, unit generates missing data diagnostic event as well.	Malfunction This can occur if the unit lost GPS signal.	Malfunction The driver should keep a paper log until the driver logs out from the vehicle or the end of the DOT day (whichever comes first). Check unit's communication and GPS signal. Check that there is no blockage for line of sight. Check for any GPS Blockers. If problem persists, contact your administrator or call support.
Timing	NA	A Timing Compliance Malfunction occurs when the unit's time deviates from its reference source by more than 10 minutes.	Malfunction This can occur if the unit could have experienced Clock Drift.	Malfunction The driver should keep a paper log until the driver logs out from the vehicle or the time deviation falls below 10 minutes (whichever comes first). Check the unit's communication. If problem persists, contact your administrator or call support.
Other ELD Detected