Recall 21V187 affects 41 2018-2021 Arboc Spirit Of Equess buses for incorrect engine control software. Repair is free at any franchised Arboc dealer.
Arboc is recalling 41 2018-2021 Spirit Of Equess buses under recall 21V187 because incorrect engine control module calibration can keep the engine from limiting speed or torque for braking, traction, stability, speed control, or collision avoidance functions. If those safety functions do not work properly, crash risk increases; Arboc dealers will complete the recall repair free of charge.
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What's wrong?
The engine control module on 2018-2021 Arboc Spirit Of Equess buses with Cummins Westport B6.7N natural gas engines is the computer that manages engine power. Its software calibration tells the engine how to respond when other systems ask it to reduce speed or torque during braking, traction control, stability control, speed control, or collision avoidance.
On affected buses, that calibration is wrong. When a safety-related system sends a command for less engine speed or torque, the engine does not limit power as intended. That breaks the handoff between the bus safety system and the engine, so a braking or stability function does not get the engine response it expects.
There is no warning sign before failure. The issue is in the software calibration, so the driver does not get a sound, smell, fluid leak, or warning behavior that confirms the bus is affected before the system fails to respond correctly.
Who's affected?
Covers the 2018, 2019, 2020, and 2021 model years, with engine control module software calibration listed under both software and engine components.
| 2021 Arboc Spirit Of Equess | Software |
|---|---|
| 2021 Arboc Spirit Of Equess | Engine |
| 2019 Arboc Spirit Of Equess | Software |
| 2019 Arboc Spirit Of Equess | Engine |
| 2020 Arboc Spirit Of Equess | Software |
| 2020 Arboc Spirit Of Equess | Engine |
| 2018 Arboc Spirit Of Equess | Software |
| 2018 Arboc Spirit Of Equess | Engine |
| Units affected | 41 |
| Field incidents | NHTSA has logged no field incidents to date. |
The year and model narrow the vehicle list, but the VIN decides. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
If braking, stability, speed, or collision-avoidance functions stop working properly, the vehicle can be harder to control and the crash risk rises. There is no warning sign before failure, so schedule the recall repair soon and use extra caution until it is complete. Repair is free at any franchised Arboc dealer.
What should I do?
- Check your VIN to confirm your 2018-2021 Arboc Spirit Of Equess bus is included in this recall.
- Contact Arboc customer service at 1-866-953-5555 to schedule the free Cummins engine control module recalibration.
- Ask where to take the bus for the software update that restores the intended engine speed and torque limits for braking, traction, stability, speed control, and collision avoidance functions.
- Bring the recall notice if Arboc sent one. If not, reference recall number 21V187 when you call.
- Drive cautiously until the recalibration is complete, and leave extra following distance.
What happens at the repair
At the dealer, an Arboc technician recalibrates the engine control module software so the engine speed and torque limits work as intended for braking, traction, stability, speed control, and collision avoidance functions. The software update and labor are free under the recall. Out-of-pocket repairs already paid are handled through the manufacturer's limited warranty, not through a separate reimbursement program, because failures before the recall notice would have been covered under that warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| March 18, 2021 | NHTSA published the recall |
|---|---|
| April 5, 2021 | Owner notification mailed |
Frequently asked questions
What is recall 21V187?
Recall 21V187 covers 41 2018-2021 Arboc Spirit Of Equess buses equipped with Cummins Westport B6.7N natural gas engines. The engine control module software is calibrated incorrectly, affecting engine speed or torque limits tied to braking, traction, stability control, speed control, or collision avoidance.
What should I do if my 2018-2021 Arboc Spirit Of Equess is on this recall?
Check your VIN to confirm your specific bus is included in recall 21V187. If it is, contact Arboc customer service at 1-866-953-5555 or a Cummins dealer to arrange the engine control module recalibration. The dealer repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and Arboc's remedy states that Cummins dealers will recalibrate the engine control module free of charge. Parts and labor are covered for included vehicles.
What is the safety risk?
The risk is a higher chance of a crash. If braking, stability, speed control, or collision avoidance functions do not work as intended, the driver has less control during safety-critical situations. The free repair recalibrates the engine control module so those limits work properly.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/21V187000 |
|---|---|
| Arboc customer service | 1-866-953-5555 |
| NHTSA recall # | 21V187 |
| NHTSA recall # (full) | 21V187000 |
Source documents
-
Download Recall Report (PDF) - Download Owner Notification Letter (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 23, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →