Recall 18V124 affects 1,047 2016-2019 Ic Bus Cesb school buses for LPDM relay failure. Repair is free at any franchised Ic Bus dealer.
Ic Bus is recalling 1,047 2016-2019 Cesb school buses with 8.8L LPG engines because the LPDM relay for the propane booster pump and scavenge pump can fail and stop the fuel pump. If the pump stops, the bus will stall and the risk of a crash rises; Ic Bus dealers will complete the free repair.
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What's wrong?
The 2016-2019 Ic Bus Cesb uses an 8.8L LPG engine, which depends on electric pumps to keep propane moving through the fuel system. The LPDM relay is the electrical switch that powers the propane booster pump and scavenge pump. When the engine needs fuel, that relay closes its contacts so the pumps keep running.
On affected buses, the adjustable spring inside the relay was set incorrectly at the relay manufacturer. That spring controls contact pressure, the force that keeps the relay's electrical contacts touching. When contact pressure is wrong, the relay can fail intermittently and stop the propane booster pump and scavenge pump. With fuel delivery interrupted, the engine can stumble, shut down, or stall during operation.
There is no warning sign before failure. A driver should treat an engine stumble, sudden shutdown, or stall as a sign that fuel delivery has already been interrupted, not as advance notice.
Who's affected?
Spans 2016-2019 model years, with the electrical system and fuel pump listed across each model year.
| 2016 Ic Bus Cesb | electrical system |
|---|---|
| 2016 Ic Bus Cesb | fuel system |
| 2017 Ic Bus Cesb | electrical system |
| 2017 Ic Bus Cesb | fuel system |
| 2018 Ic Bus Cesb | electrical system |
| 2018 Ic Bus Cesb | fuel system |
| 2019 Ic Bus Cesb | electrical system |
| 2019 Ic Bus Cesb | fuel system |
| Units affected | 1,047 |
| Field incidents | NHTSA has logged 35 field incidents to date. |
The year and model narrow the recall, but the VIN decides. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
If the fuel pump stops, the bus stalls, increasing the risk of a crash. There is no warning sign before failure, so confirm whether your VIN is included and schedule the relay replacement soon. Repair is free at any franchised Ic Bus dealer.
What should I do?
- Check your VIN to confirm your 2016-2019 Ic Bus Cesb is included in this recall.
- Contact a franchised Ic Bus dealer to schedule the free LPDM relay replacement, which fixes the relay failure that can stop the propane fuel pump and stall the bus.
- Bring the recall notice if Ic Bus mailed one. If not, reference recall number 18V124 when you call.
- Drive cautiously until the repair is complete, and pull over safely if the bus loses power or stalls.
What happens at the repair
At the dealer, an Ic Bus technician replaces the LPDM relay for the propane booster pump and scavenge pump. Parts and labor are covered under the recall. If you paid out of pocket for a related relay or fuel pump repair before the owner notice, the manufacturer's standard reimbursement plan applies. Bring repair orders, payment records, and the owner notification instructions to the service desk.
| Reimbursement | Reimbursement available |
|---|
Timeline
| February 20, 2018 | NHTSA published the recall |
|---|---|
| April 12, 2018 | Owner notification mailed |
| April 20, 2018 | Dealer notification began |
| April 20, 2018 | Dealer notification ended |
| April 20, 2018 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| April 20, 2018 | Interim owner notification (was planned for this date) |
Frequently asked questions
What is recall 18V124?
Recall 18V124 covers 1,047 2016-2019 Ic Bus Cesb school buses with 8.8L LPG engines. The LPDM relay for the propane booster pump and scavenge pump can fail intermittently, stopping the fuel pump. If the fuel pump stops, the bus will stall, increasing crash risk.
What should I do if my 2016-2019 Ic Bus Cesb is on this recall?
Check your VIN to confirm your specific bus is included in recall 18V124. If it is, contact a franchised Ic Bus dealer to schedule the LPDM relay replacement. Reference recall 18V124 and Navistar recall 18501 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to repair safety defects at no cost. Ic Bus dealers will replace the LPDM relay free of charge for included buses under recall 18V124.
What is the safety risk?
The safety risk is a stall while the bus is in use. If the LPDM relay fails and the fuel pump stops, the bus will stall, increasing the risk of a crash. The repair path is to have the dealer replace the relay for free.
Who should I call about recall 18V124?
Call a franchised Ic Bus dealer first to schedule the free LPDM relay replacement. You can also contact Navistar customer service at 1-800-448-7825 and reference Navistar recall number 18501.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/18V124000 |
|---|---|
| Ic Bus customer service | 1-800-448-7825 |
| NHTSA recall # | 18V124 |
| NHTSA recall # (full) | 18V124000 |
Source documents
-
Download Recall Investigation Document (PDF) (PDF) - Download Owner Notification Letter (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 25, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →