What Is an ELD? How Electronic Logging Devices Work for Truck Drivers
What is an ELD? It logs your driving time automatically from engine data. Learn how it works, who needs one, the exemptions, and what it records.
Read articleELD Malfunction: What To Do Step by Step (The 8-Day Paper Log Rule)
An ELD malfunction does not mean you have to park the truck.
Stay inside your hours, tell your carrier in writing within a day, and log by hand until the device is repaired.
The rule behind this is 49 CFR 395.34.
Numbers to keep on the dash:
- 24 hours is your deadline to notify the carrier in writing.
- 8 days of logs go on paper: today plus the previous 7 days.
- 5 days is the carrier's deadline to request more time.
- 8 days is the carrier's deadline to repair or replace the device.
Is It an ELD Malfunction or a Diagnostic Event?
Only malfunctions start the paper-log clock. Letter codes are malfunctions. Digit codes are diagnostic events.
| Code | Trigger |
|---|---|
| P | Power lost for 30+ minutes of driving in 24 hours |
| E | Engine link lost for 30+ minutes in 24 hours |
| T | Clock off UTC by more than 10 minutes |
| L | No valid GPS fix for 60 cumulative minutes in 24 hours |
| R | Can't record or retrieve required events |
| S | Three failed data transfer checks in a row |
| O | Other fault the ELD detects |
| 1-6 | Diagnostic events, including code 5 (30+ minutes of unidentified driving) |
Switch to paper when the ELD can't record or show your hours accurately. A diagnostic event that clears itself usually doesn't need paper.
A crossed-out truck beside a warning triangle usually means the unit lost its link to the vehicle. Check your provider's malfunction sheet.
Screenshot before you shut it down. If the HOS recap screen still loads, capture it. It helps you rebuild the last 7 days.
What To Do When Your ELD Malfunctions
- Stay legal, then read the code. Your 11-hour, 14-hour and 70-hour limits keep running. Pull over before touching the tablet.
- Try quick fixes if it's safe. Restart the app and reseat the port cable. Note the problem even if the code clears.
- Write down the evidence. Record code, date, time, location, truck number and odometer. Take a timestamped photo.
- Notify your carrier in writing within 24 hours. A text or email leaves a record. A phone call doesn't.
- Rebuild your logs on paper. Cover today and the previous 7 days on graph-grid sheets under 49 CFR 395.8. Skip days you can still pull from the ELD.
- Stay on paper until the repair is done. Once the device is compliant again, go back to it and give your paper sheets to the carrier.
A notice like this is enough:
"ELD malfunction, truck 214. Code E at 9:40 AM Tuesday near Valdosta, GA, odometer 482,310. Switching to paper. Photos attached."
The "8-Day Paper Log Rule" Is Four Different Rules
| The "8" | What it means | Source |
|---|---|---|
| Repair window | Carrier repairs or replaces a failed ELD within 8 days of discovery or your notice | 395.34(c) |
| Paper cap | Malfunction paper logging can't pass 8 days without an FMCSA extension | FMCSA guidance |
| 8 days in any 30 | Paper is allowed if you need a log on 8 or fewer days in a rolling 30 | 395.8(a)(1)(ii)(A)(1) |
| Blank grids | The cab holds blank sheets for at least 8 days | 395.22(h) |
Drivers mix these up. A broken ELD doesn't give you 8 free paper days.
The 8-in-30 exception is a rolling window, not a calendar month. A ninth log day generally puts you back on an ELD.
You'll hear that paper is limited to 7 days or 2 days a week. Neither number is in the rule.
Paper Logs and Roadside Inspections
Rebuild missing days from dispatch messages, bills of lading, and fuel and scale receipts. Mark uncertain times in the remarks.
An honest gap beats a guess. Backfilled entries are falsification. Submit paper logs to your carrier within 13 days.
At the roadside, tell the officer first. Then hand over:
- The device, showing the code
- Paper logs from the malfunction day to today
- The reconstructed previous 7 days
- Your dated written notice
Officers vary. Some also ask for a provider service ticket, so keep a screenshot.
No paper? Say so and show the notice. Rebuild on a compliant grid or app, and ask the carrier for a printout.
The Carrier's Side: 8-Day Repair and Extensions
The carrier's 8 days start on the earliest of discovery or your notice. Your written notice is the timestamp.
To request more time, the carrier files a signed request with its FMCSA Division Administrator, under 395.34(d). It's due within 5 days of your notice.
The request includes:
- Contact details for the filer
- Make, model and serial number of each ELD
- Date and location of each malfunction
- A description of good-faith repair efforts
A complete, timely request keeps the carrier treated as compliant while FMCSA decides.
FMCSA's guidance also lists ELD-Extension@dot.gov. Confirm the current filing method with your Division office.
- Leased-on driver. You notify. The carrier repairs and files any extension.
- Owner-operator. You do both jobs.
When It Isn't an ELD Malfunction
- Revoked device. FMCSA removed five ELDs on August 6, 2026, with an October 6 deadline to replace them, per FMCSA. No repair clock applies. Check the FMCSA registered list.
- Unassigned ELD. If the unit isn't logged in to you, your driving lands as unidentified driving. Report it on day one.
- Driving while parked. Don't certify a day showing driving you didn't do. Annotate it and ask your carrier's logs team.
- Pulling the fuse. This creates a tampering question, not a legal malfunction.
- Exemptions. Short-haul timecards, the 8-in-30 exception and pre-2000 engines follow their own rules.
What Belongs in the Cab
49 CFR 395.22(h) requires:
- The data transfer instruction sheet
- The malfunction instruction sheet
- Blank graph-grids for at least 8 days
A final rule effective July 22, 2026 dropped the user's manual from that list.
Check the indicator, cable and unassigned driving each morning. On a connected in-cab tablet, keep the app updated.
ELD Malfunction Questions
1. Can I keep driving with an ELD malfunction?
Yes, as long as your hours allow it and you follow the procedure. The malfunction itself isn't a violation, but hiding it or faking records is.
2. How long can I use paper logs?
FMCSA guidance says paper logging can run up to 8 days after the malfunction, unless your carrier gets an extension. Past that without proof, you can be placed out of service.
3. Do I have to rewrite the last 7 days by hand?
No, not if you already hold those days or can still pull them from the ELD. A printout or PDF of the records counts.
4. Who do I contact first?
Tell your carrier first, in writing, because that notice starts the 24-hour and 8-day clocks. Then call your ELD provider for troubleshooting and repair.
When To Replace the ELD
Replace the unit if a code keeps returning after a reset and update, a repair passes 8 days, or the model leaves the FMCSA list.
Top Tracking System was founded in 2016. It launched its FMCSA-compliant ELD in December 2017, month-to-month.
Weighing a switch? Talk to a fleet specialist or browse ELD and GPS hardware.
Read how ELDs improve driver safety and fleet compliance and the weekly HOS and ELD audit playbook. You can also learn about Top Tracking System.
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