Recall 18V665 affects 90 2017-2018 Gillig Low Floor buses for transmission pressure-switch failure. Repair is free at any franchised Gillig dealer.
Gillig is recalling 90 2017-2018 Low Floor transit buses equipped with Allison transmission hybrid drive units because pressure switches in those units can fail. A loss of drive can disable the bus unexpectedly and raise crash risk; Gillig dealers will complete the repair free of charge.
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What's wrong?
The Allison hybrid drive unit in a 2017-2018 Gillig Low Floor bus is part of the automatic transmission system that sends power from the engine and hybrid system to the drive wheels. Inside that unit, pressure switches report hydraulic pressure to the transmission controls. Those pressure readings help the system decide when the drive unit is ready to move the bus.
On affected buses, the pressure switches were built with recycled resin instead of the specified material. That material choice created a defect in the switch body and can allow the switch to fail. When the switch fails, the transmission controls lose the pressure information they need, and the bus can lose drive.
The warning sign is a transmission DTC code. A DTC is a diagnostic trouble code stored by the vehicle's control system, so a driver or service technician sees it through the bus's warning system or a scan tool before the switch failure is confirmed.
Who's affected?
The same automatic transmission component appears across the 2017 and 2018 Low Floor scope.
| 2017 Gillig Low Floor | automatic transmission |
|---|---|
| 2018 Gillig Low Floor | automatic transmission |
| Units affected | 90 |
A matching year and model does not confirm inclusion. Check your VIN to confirm whether your specific bus is included.
What's the safety risk?
A loss of drive can disable the vehicle unexpectedly and increase the risk of a crash. Transmission diagnostic trouble codes are the warning sign to treat seriously. If they appear, stop using the vehicle for service and schedule the recall repair soon. Repair is free at any franchised Gillig dealer.
What should I do?
- Check your VIN to confirm your 2017-2018 Gillig Low Floor bus is included in this recall.
- Contact a Gillig service contact or Allison Transmission service center to schedule the free pressure-switch replacement that fixes the loss-of-drive risk.
- Bring the recall notice if Gillig mailed one. If not, reference recall number 18V665 when you call.
- Keep the bus out of regular passenger service until the repair is complete if it has signs of drive loss or transmission trouble.
What happens at the repair
At the service center, a Gillig technician replaces the C1 and C2 pressure switches in the Allison Transmission hybrid drive unit. The recall repair is available now, and parts and labor are free. The technician should address the pressure switch failure that can cause loss of drive, then confirm the drive unit is ready to return to service. Contact Gillig customer service or an Allison Transmission service center to arrange the free replacement.
Timeline
| September 25, 2018 | NHTSA published the recall |
|---|---|
| October 1, 2018 | Dealer notification began |
| October 1, 2018 | Interim owner notification (was planned for this date) |
| October 4, 2018 | Owner notification mailed |
| October 30, 2018 | Dealer notification ended |
Frequently asked questions
What is recall 18V665?
Recall 18V665 covers 90 2017-2018 Gillig Low Floor transit buses with Allison transmission hybrid drive units. The C1 and C2 pressure switches can fail and cause a loss of drive, which can disable the bus unexpectedly and increase crash risk.
What should I do if my 2017-2018 Gillig Low Floor is on this recall?
Check your VIN to confirm your specific bus is included in recall 18V665. If it is, contact Allison Transmission at 1-800-252-5283 or Gillig customer service at 1-800-735-1500 to arrange replacement of the C1 and C2 pressure switches.
Is the recall repair free?
Yes. Federal recall law requires the recall repair at no cost, and Gillig says Allison Transmission service centers will replace the C1 and C2 pressure switches free of charge. Parts and labor are covered for buses included in recall 18V665.
What is the safety risk?
The safety risk is an unexpected loss of drive. If the Allison hybrid drive unit loses drive while the bus is in service, the vehicle can become disabled and crash risk increases. The fix is replacement of the C1 and C2 pressure switches.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/18V665000 |
|---|---|
| Gillig customer service | 1-800-252-5283 |
| NHTSA recall # | 18V665 |
| NHTSA recall # (full) | 18V665000 |
Source documents
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 →