What do I do when my ELD malfunctions?

Chapter 01

Is it a malfunction or just a warning?

It is a malfunction when the ELD lights its malfunction indicator and records a letter code: P, E, T, L, R, S or O. That means the device itself can no longer keep a true record (FMCSA’s technical rules for ELDs). A number from 1 to 6 means a data diagnostic event. That is a problem with one driver’s data, not a broken device. Only a malfunction requires the driver to switch to paper logs and starts the 8-day repair period. For a diagnostic event, the driver follows your instructions and the ELD provider’s to clear it (the malfunction rule).

Here is how that looks in real life. Say you run two trucks from a yard in Illinois. You drive one of them yourself, and a hired driver runs the other. On Thursday, October 15, 2026, you are unloading in Ohio when your driver calls from a truck stop near Flagstaff, Arizona. It is 6:50 in the morning there. His ELD shows the malfunction light and the letter R. The tablet will not open his logs for previous days.

The letter tells you what went wrong. Every ELD maker must use the same seven letters (FMCSA’s technical rules for ELDs). So a code means the same on any brand. Here is what each one says in plain words.

So your driver’s R is a real malfunction. The numbers 1 to 6 are warnings about one driver’s data. Number 1 is power, 2 is the engine link, 3 is a missing piece of data and 4 is sending records. Number 5 is driving with nobody logged in, and 6 is anything else the maker’s checks catch. Some warnings grow into a malfunction if nobody clears them. A power warning becomes P at 30 minutes of missed driving in a day. An engine warning becomes E after more than 30 minutes without the engine link (FMCSA’s technical rules for ELDs). Code 5 needs separate attention, explained in our guide to unassigned driving and ELD edits.

Each maker also describes its own malfunctions. FMCSA’s list of registered ELDs shows that description next to each device, along with its user manual (FMCSA’s list of registered ELDs). Look yours up once, before you need it.

Chapter 02

What must happen in the first 24 hours?

Three things. The driver notes the malfunction and gives you written notice within 24 hours. He rebuilds his logs on paper for today and the previous 7 days. He can skip that only if he already has those records or can pull them up on the ELD. From then on he stays on paper until the device is fixed (the malfunction rule). Your job is to make that possible. The right papers must be in the truck, the old records must reach him, and the repair should start the same day.

Back to Thursday morning. Ask your driver for the notice in writing right away, even though he has already told you by phone. The rule does not say what form the notice must take. A text or an e-mail with the date, the time, the place and the letter on the screen gives you a record. Your driver sends a photo of the screen and two lines by text at 7:10 a.m. Save it with the truck’s file. That message documents the driver’s written notice. Keep track of when you first learned of the fault, too, because that starts the repair period.

Next, the paper. Every truck must carry an ELD packet. It holds two instruction sheets. One shows how to send records to an officer, and the other says what to do when the device breaks down. It also holds blank paper logs for at least 8 days (the carrier’s ELD rule). The malfunction sheet is the driver’s guide for this morning. Your driver has the packet, but look at the numbers. Today plus the 7 days before it make 8 days. When the device cannot show the past week, rebuilding it takes all 8 blank logs. So your driver buys a paper logbook at the truck stop before he rolls. From now on, keep more than the minimum in both trucks, yours included.

Where can you find the past week’s logs? They are still available in your online ELD account. The rules make you keep a backup copy of ELD records on a separate device for 6 months anyway (the carrier’s ELD rule). You open the account on your phone and send your driver his logs for October 8 to 14. Could he just show that file to an officer? The rule excuses him from the rebuild only when the driver “already possesses the records” or can get them from the ELD. We could not find FMCSA’s own answer on whether a copy from the office counts. So your driver copies the week onto paper from what you sent. That way the paper matches the electronic record line for line.

You cannot fill in the logs for him. The rule says all entries about his duty status must be made by the driver (the logbook rule). What you can do is make sure each page is complete. Each daily log needs a duty-status grid and the required details. There is the date, the miles driven that day and the truck and trailer numbers. There is your company name, your main office address and the time the day starts. It also needs the total hours for each line, and the shipping document number or the shipper and the load. Add the other driver’s name if two share the truck, any remarks, and the driver’s signature. Each change of duty status needs the city or town and the State.

Watch the clock on those pages. They run on the time at the driver’s home terminal, not the local time (the logbook rule). Your yard is in Illinois. In October, Illinois is 2 hours ahead of Arizona. So 6:50 a.m. at the truck stop goes on the grid as 8:50 a.m. By 9 a.m. local time your driver is back on the road, on paper. The first job is done. The second is the repair.

Chapter 03

How long do I have to fix it?

You have 8 days. The rule says the carrier “must take actions to correct the malfunction of the ELD within 8 days” (the malfunction rule). The days count from when you found the problem or when the driver told you, whichever came first. The rule does not speak of working days, so count weekends too. The truck may run on paper logs during that time. Outside a malfunction, a driver may keep paper logs only if one of the exceptions in which ELD exemption applies to your trucks covers him. If the device cannot be fixed or replaced in time, you can ask FMCSA for more time. That request must go out within 5 days of the driver’s notice.

Your driver told you on Thursday, October 15, so the 8 days run out on Friday, October 23. If your ELD account had shown you the malfunction before he called, the days would count from that moment instead. That Thursday morning you call the ELD provider and ask them to read the malfunction record with you. They say the unit’s storage has failed and it must be replaced. A new unit can reach your yard, but not before Tuesday, October 27. That is 12 days after the notice. Your driver is due home that week anyway.

Try to beat the deadline first, because a request for more time must show a real effort. So on Thursday you also ask the provider for faster shipping and for a loaner unit. You also ask whether another device could go in sooner. Any replacement must be on FMCSA’s list of registered ELDs (the carrier’s ELD rule). A device that FMCSA has removed from that list is a different problem with its own steps. That case is covered in what to do when your ELD is removed from the list. Here nothing comes faster, so you ask for more time.

The request goes to the head of FMCSA’s office for the State where your company has its main place of business. The rule calls this person the Division Administrator. For you, that is FMCSA’s Illinois office, not Arizona’s. The deadline is 5 days after the driver’s notice, which makes it Tuesday, October 20 (the malfunction rule). Someone must sign it on the company’s behalf. It must name the person sending it, with an address and phone number. It must give the make, model and serial number of each ELD, and the date and place of each malfunction as the driver reported it. And it must say briefly what you did to repair or replace the device, and why you need more than 8 days. Here is what yours could look like.

To the FMCSA Division Administrator, Illinois

Request for more time to repair an ELD. Company: [your company name], USDOT [number]. Sent by: [your name], [address], [phone].

Device: [make], model [model], serial number [number], in truck 2. Malfunction: reported by the driver on October 15, 2026, near Flagstaff, Arizona. The screen showed the malfunction light and the letter R.

What we did: we called the provider the same day. The unit must be replaced, and the earliest delivery is October 27. We asked for faster shipping and a loaner unit, and neither is available. The driver is logging on paper. We ask for time until October 30, 2026.

Signed: [your name], owner, October 16, 2026

You send it on Friday, October 16, and keep proof of the date. The rule does not say whether to mail it or send it another way, so find the office’s address before you need it. Once a complete request is in, you are treated as meeting the ELD rule until FMCSA decides. That holds only while you and the driver keep up everything else in the rule (the malfunction rule). In plain words, the logs stay on paper. FMCSA answers in writing. It may give you more time and add conditions, and its answer is final. Say its letter gives you until October 30. We made that answer up for the story. We found no published figures on how often FMCSA agrees, or how fast it replies.

Chapter 04

What if an officer inspects the truck before the fix?

The driver hands the officer his paper logs for today and the previous 7 days. That is what the rule asks for during a malfunction (the malfunction rule). If he cannot show logs for all of those days, the officer can put him out of service (the out of service rule). There is one narrow exception. If only today and yesterday are missing and the 6 days before are complete, he gets the chance to fill them in.

On Wednesday, October 21, your driver is inspected at a weigh station in Missouri. The officer asks for his hours. He hands over his logs for October 14 to 21. He also shows his text to you from October 15 and your request for more time. No rule requires those two papers. But they answer the officer’s first question: when did the device break, and what is the carrier doing about it? The officer checks the hours, and your driver goes on his way. How a driver should behave from the moment the lights come on is in what to do when your truck is pulled over.

Now picture the same stop with no logs on paper. Your driver could be put out of service. He could not drive again until he had rested as long as the hours rules require and his logs were in order. You may not send him on before that (the out of service rule). He would have to get the order to you within 24 hours. You would then have 15 days from the inspection to fill in your part of the form and send it to FMCSA. And if an officer writes up an hours violation that his logs disprove, you can ask to have it corrected through DataQs.

The new unit arrives on Tuesday, October 27. Your driver logs in, and the truck is back on the ELD. From now on, an officer gets the records the normal way. The driver sends them from the device, following your instruction sheet (the ELD driver rule). So test that once with the new unit. Then close the file. Each paper log must reach you within 13 days of the day it covers. You keep the logs and their supporting papers for 6 months, and the driver keeps the last 7 days with him (the logbook rule). So use a logbook that makes a copy of each page. One copy stays in the truck, and one comes to you. Keep the driver’s text, the repair invoice, your request and FMCSA’s letter in the same folder. If an auditor asks about those days, the folder tells the whole story. Our list of records to keep shows where hours records fit among the rest.

What has changed lately? The malfunction rule itself has not changed since 2016 (the malfunction rule), and we found no new rule on it in 2025 or 2026. The change is in the packet. Since July 22, 2026, the truck no longer needs to carry the ELD user’s manual (the rule FMCSA published in June 2026). FMCSA says every manual is on its list of registered ELDs. Checklists that still demand a manual in the cab are out of date. The two instruction sheets and the blank logs are still required.

There are also things we could not check. FMCSA publishes answers to common ELD questions on its website. That site blocks our tools, and the web archive was out of reach, so we could not read what it says about malfunctions. This page rests on the rule text alone. Ask FMCSA or your provider about the points the rule leaves open. One is whether a copy sent from your office counts as records the driver already has.

If you want help with the paperwork after a breakdown or an inspection, here is what we offer.