Recall 15V828 affects 18 2015 Horton Ambulance 553, 623, 503, 603, and 453 ambulances for i4G electrical failure. Repair is free.
Horton Ambulance is recalling 18 2015 553, 623, 503, 603, and 453 ambulances equipped with the i4G electrical control system because an incorrectly installed circuit board component can shut down body electrics. That failure can disable interior and exterior lights and equipment such as the oxygen system, hindering emergency response and rescue efforts; the dealer repair is free.
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What's wrong?
The i4G electrical system on these 2015 Horton Ambulance 553, 623, 503, 603, and 453 ambulances controls the ambulance body electrics. That system sends power and commands to body equipment such as interior lights, exterior lights, and oxygen system controls. A circuit board inside the SIO node acts like a traffic controller for those electrical signals.
In the affected units, a diode on the SIO node circuit board was installed backwards during assembly. A diode is a one-way electrical part, so backward installation blocks or misroutes current instead of letting the circuit work as designed. When that board fails to control the body electrical system correctly, the ambulance body can lose lights and other electrical equipment needed during patient care.
There is no warning sign before failure. An owner or crew member learns about the problem when body lights or connected ambulance equipment stop responding, so the defect needs dealer inspection rather than symptom-based driving judgment.
Who's affected?
Covers the 453, 503, 553, 603, and 623 model lines from 2015, all tied to the electrical system.
| 2015 Horton Ambulance 553 | electrical system |
|---|---|
| 2015 Horton Ambulance 623 | electrical system |
| 2015 Horton Ambulance 503 | electrical system |
| 2015 Horton Ambulance 603 | electrical system |
| 2015 Horton Ambulance 453 | electrical system |
| Units affected | 18 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching 2015 Horton Ambulance model does not confirm inclusion. Check your VIN to confirm whether your specific vehicle is included.
What's the safety risk?
Ambulance body electrical failure can interfere with emergency response and rescue work. That raises the risk of injury to patients. Treat any loss of body electrical functions as a service concern and schedule recall repair promptly. Repair is free at any franchised Horton Ambulance dealer.
What should I do?
- Check your VIN to confirm your 2015 Horton Ambulance 553, 623, 503, 603, or 453 is included in this recall.
- Contact a franchised Horton Ambulance dealer to schedule the free electrical-component replacement that fixes the incorrectly installed circuit-board component.
- Reference recall number 15V828 when you call, and bring the recall notice if you have it.
- Ask Horton Ambulance customer service at 1-800-282-5113 about repair timing if the dealer needs help confirming the recall.
- Avoid emergency service use if the ambulance body lights, oxygen system, or other body electrics fail before the repair.
What happens at the repair
At the dealer, a Horton Ambulance technician replaces the affected electrical component in the i4G system that controls the ambulance body electrics. That repair addresses the incorrectly installed circuit board component tied to lighting and other ambulance electrical equipment. The replacement parts and labor are free under recall 15V828. The reimbursement file shows a general plan on file, so documented out-of-pocket repairs for the same electrical condition are handled through Horton's reimbursement process. Bring repair paperwork and payment records to the service desk, or contact Horton customer service at 1-800-282-5113.
| Reimbursement | Reimbursement available |
|---|
Timeline
| December 8, 2015 | Dealer notification began |
|---|---|
| December 8, 2015 | Dealer notification ended |
| December 8, 2015 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| December 8, 2015 | Interim owner notification (was planned for this date) |
| December 9, 2015 | NHTSA published the recall |
| January 4, 2016 | Owner notification mailed |
Frequently asked questions
What is recall 15V828?
Recall 15V828 covers 18 2015 Horton Ambulance 553, 623, 503, 603, and 453 ambulances with an incorrectly installed i4G circuit board component. The defect can cause ambulance body electrical failure, including interior lights, exterior lights, and life-saving electrical equipment such as the oxygen system.
What should I do if my 2015 Horton Ambulance 553, 623, 503, 603, or 453 is on this recall?
Check your VIN to confirm your specific ambulance is included in recall 15V828. If it is, contact Horton Ambulance customer service at 1-800-282-5113 or a Horton Ambulance service location to arrange replacement of the affected electrical component. Reference recall number 15V828 when you call.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost, and Horton Ambulance will replace the affected electrical component free of charge. The recall began on January 4, 2016, so the repair path is open.
What is the safety risk?
Failure of the ambulance body electrical system can hinder emergency response or rescue efforts. The recalled component controls equipment such as interior lights, exterior lights, and the oxygen system, so an electrical failure can increase injury risk for ambulance patients.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/15V828000 |
|---|---|
| Horton Ambulance customer service | 1-800-282-5113 |
| NHTSA recall # | 15V828 |
| NHTSA recall # (full) | 15V828000 |
Source documents
-
Download Owner Notice (PDF) - Download Recall Report (PDF)
- Download Quarterly Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 31, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →