Recall 24V281 covers 76 2019-2024 Rev Ambulance Type Ix, Type I, and Type Iii vehicles for overloaded circuits. Free firmware update at any franchised Rev Ambulance dealer.
Rev Ambulance is recalling 76 2019-2024 Type I, Type Iii, and Type Ix vehicles equipped with Weldon Vmux HC1.7 multiplex nodes because a short circuit or wiring failure can leave an output pin on and overload electrical circuits. Overloaded circuits can overheat and increase the risk of fire; Rev Ambulance dealers will complete the recall repair free of charge.
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What's wrong?
The V-MUX HC1.7 Input / Output Node on 2019-2024 Rev Ambulance Type Ix, Type I, and Type Iii vehicles is part of the electrical control system. It receives signals from switches and vehicle systems, then turns electrical outputs on or off. In an ambulance body, that node helps control equipment circuits through software instead of separate manual switches for every circuit.
The problem is in the node firmware, which is the software stored inside the electrical module. During a short circuit or wiring failure, the firmware can fail to shut off an output pin. When that pin stays on, the connected circuit stays energized and becomes overloaded instead of being protected by the node.
There is no warning sign before failure. The driver can lose that protection without a dashboard message or other advance notice, so the problem is found by recall status and service inspection rather than by a symptom the driver can reliably feel.
Who's affected?
Spans Type I, Type Iii, and Type Ix configurations across the 2019-2024 model years, all tied to the electrical system.
| 2020 Rev Ambulance Type Ix | electrical system |
|---|---|
| 2021 Rev Ambulance Type I | electrical system |
| 2022 Rev Ambulance Type I | electrical system |
| 2023 Rev Ambulance Type I | electrical system |
| 2024 Rev Ambulance Type Ix | electrical system |
| 2022 Rev Ambulance Type Ix | electrical system |
| 2019 Rev Ambulance Type Ix | electrical system |
| 2022 Rev Ambulance Type Iii | electrical system |
| 2019 Rev Ambulance Type I | electrical system |
| 2020 Rev Ambulance Type I | electrical system |
| 2024 Rev Ambulance Type I | electrical system |
| 2023 Rev Ambulance Type Ix | electrical system |
| 2021 Rev Ambulance Type Iii | electrical system |
| 2021 Rev Ambulance Type Ix | electrical system |
| 2023 Rev Ambulance Type Iii | electrical system |
| 2020 Rev Ambulance Type Iii | electrical system |
| 2024 Rev Ambulance Type Iii | electrical system |
| Units affected | 76 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not confirm inclusion. Check your VIN to confirm whether your specific vehicle is included.
What's the safety risk?
Overloaded electrical circuits can overheat and increase the risk of fire. There is no warning sign before failure, so arrange the dealer firmware update promptly if your VIN is included. Repair is free at any franchised Rev Ambulance dealer.
What should I do?
- Check your VIN to confirm your 2019-2024 Rev Ambulance Type Ix, Type I, or Type Iii is included in this recall.
- Contact a franchised Rev Ambulance dealer to schedule the free firmware update that corrects the multiplex-node output failure and reduces the fire risk.
- Bring the recall notice if Rev Ambulance mailed one. Reference recall number 24V281 when you call.
- Call Rev Ambulance customer service at 1-855-661-9232 with questions about scheduling or the repair.
- Limit use until the firmware update is complete, and stop operating the vehicle if electrical problems appear.
What happens at the repair
At the dealer, a Rev Ambulance technician updates firmware in the Weldon Vmux HC1.7 Input/Output multiplex node. The update addresses the node behavior that left an output pin on after a short circuit or wiring failure. The recall repair is free, and service labor is covered. REV mailed owner notification letters on May 17, 2024, so an included vehicle can be scheduled with an authorized dealer for the firmware update now.
Timeline
| April 19, 2024 | NHTSA published the recall |
|---|---|
| May 3, 2024 | Dealer notification began |
| May 17, 2024 | Owner notification mailed |
| May 17, 2024 | Interim owner notification (was planned for this date) |
| May 31, 2024 | Dealer notification ended |
Frequently asked questions
What is recall 24V281?
Recall 24V281 covers 76 2019-2024 Rev Ambulance Type Ix, Type I, and Type Iii vehicles with certain Weldon Vmux HC1.7 Input/Output multiplex nodes. A short circuit or wiring failure can leave an output pin on, overload electrical circuits, and increase fire risk.
What should I do if my 2019-2024 Rev Ambulance Type Ix, Type I, or Type Iii is on this recall?
Check your VIN to confirm your specific vehicle is included in recall 24V281. If it is, contact a franchised Rev Ambulance dealer to schedule the firmware update. Reference recall number 24V281 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Rev Ambulance dealers will update the affected firmware free of charge. Parts and labor are covered for vehicles included in recall 24V281.
What is the safety risk?
The safety risk is fire from overheated electrical circuits. In affected vehicles, a short circuit or wiring failure can overload the circuit because the node firmware does not shut off the output pin as intended. Rev Ambulance fixes the issue with a free firmware update.
When were owners notified about recall 24V281?
Rev Ambulance mailed owner notification letters on May 17, 2024. If you bought the vehicle used or never received a letter, check your VIN and call a franchised Rev Ambulance dealer with recall number 24V281.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/24V281000 |
|---|---|
| Rev Ambulance customer service | 1-855-661-9232 |
| NHTSA recall # | 24V281 |
| NHTSA recall # (full) | 24V281000 |
Source documents
-
Download Quarterly Report (PDF) - Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Recall Acknowledgement (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 →