Recall 23V402 covers 47 2019-2023 Mack Lrbe (Electric) trucks for a loose windscreen-heater relay cable. Repair is free at any franchised Mack dealer.
Mack is recalling 47 2019-2023 Lrbe (Electric) trucks because loose power-cable connections at the windscreen heater relay can make the relay fail. If the relay fails closed, the cabin heater stays powered, the relay can overheat, and Mack dealers will complete the repair free of charge.
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What's wrong?
The windshield heater relay on 2019-2023 Mack Lrbe (Electric) trucks is an electrical switch that controls power to the windshield heater. It lets the heater receive current when the system calls for heat, and shuts that current off when heat is no longer needed. The power cables feeding the relay have to be tight so the connection stays stable under vibration and electrical load.
On affected Mack trucks, the cable fasteners were not tightened with enough controlled torque at the factory. A loose cable connection can overheat or interrupt the relay's normal operation. In the field reports Mack reviewed, relay failures left the heater powered and damaged the heater.
There is no warning sign before failure. An owner or driver should not count on a light, message, sound, or drivability change to show that the relay connection is loose.
Who's affected?
Spans five model years, all tied to the same windshield heater relay wiring.
| 2023 Mack Lrbe (Electric) | wiring |
|---|---|
| 2022 Mack Lrbe (Electric) | wiring |
| 2021 Mack Lrbe (Electric) | wiring |
| 2020 Mack Lrbe (Electric) | wiring |
| 2019 Mack Lrbe (Electric) | wiring |
| Units affected | 47 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific truck.
What's the safety risk?
A relay that fails closed keeps power flowing to the cabin heater after it should stop. That overheats the relay and increases the risk of a fire. There is no warning sign before this issue, so schedule the repair soon and follow dealer guidance. Repair is free at any franchised Mack dealer.
What should I do?
- Check your VIN to confirm your 2019-2023 Mack Lrbe (Electric) is included in this recall.
- Contact your nearest franchised Mack dealer to schedule the free power-cable-to-relay tightening that fixes the loose windscreen heater relay connection.
- Bring the recall notice if Mack mailed one. If not, reference recall number 23V402 when you call.
- Call Mack customer service at 1-800-866-1177 with questions about the repair or dealer scheduling.
What happens at the repair
At the dealer, a Mack technician tightens the power cable connection at the windscreen heater relay so the relay connection is secure. The recall repair is free, with parts and labor covered. Mack's standard reimbursement plan covers documented eligible out-of-pocket repairs tied to this condition before the recall notice. Bring repair invoices or service paperwork to the dealer, or contact Mack customer service at 1-800-866-1177 if the dealer asks you to start the reimbursement claim with Mack.
| Reimbursement | Reimbursement available |
|---|
Timeline
| June 4, 2023 | NHTSA published the recall |
|---|---|
| June 9, 2023 | Dealer notification began |
| June 9, 2023 | Dealer notification ended |
| June 23, 2023 | Owner notification mailed |
| August 4, 2023 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 23V402?
Recall 23V402 covers 47 2019-2023 Mack Lrbe (Electric) trucks with a loose power-cable connection at the windscreen heater relay. If the relay fails closed, it can keep powering the cabin heater, overheat the relay, and increase fire risk. Mack dealers will tighten the connection for free.
What should I do if my 2019-2023 Mack Lrbe (Electric) is on this recall?
Check your VIN to confirm your specific truck is included in recall 23V402. If it is, contact a franchised Mack dealer to schedule the relay power-cable repair. Reference Mack recall number SCC0444 when you call. The dealer repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost, and Mack's remedy says dealers will tighten the power cable to relay connection free of charge. Use a franchised Mack dealer for the recall work.
Is it safe to drive a Mack Lrbe (Electric) with this recall?
Mack has not issued a do-not-drive instruction for recall 23V402. The safety concern is still real: a relay that fails closed can overheat and increase fire risk. Confirm your VIN, schedule the free repair, and ask the dealer what to do if you notice heat, smell, or electrical trouble near the cabin heater.
When were owners notified about recall 23V402?
Mack mailed owner notification letters on August 4, 2023. If you bought the truck used or never received a letter, check your VIN to confirm whether this recall applies, then call a franchised Mack dealer or Mack customer service at 1-800-866-1177.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/23V402000 |
|---|---|
| Mack customer service | 1-800-866-1177 |
| NHTSA recall # | 23V402 |
| NHTSA recall # (full) | 23V402000 |
Source documents
-
Download Recall Document (PDF) (PDF) - Download Quarterly Report (PDF)
- Download Owner Notification Letter (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Owner Notice (PDF)
- Download Recall Acknowledgement (PDF)
- Download Recall Report (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 20, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →