Steering Gearbox May Loosen – 2017-2022 Proterra Catalyst & ZX5

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February 28, 2022 NHTSA CAMPAIGN NUMBER: 22V114000

Steering Gearbox May Loosen

A loose steering gearbox can cause a loss of steering control, increasing the risk of a crash.

 

NHTSA Campaign Number: 22V114

Manufacturer Proterra, Inc.

Components STEERING

Potential Number of Units Affected 425

 

Summary

Proterra, Inc. (Proterra) is recalling certain 2017-2019 35 foot Catalyst E2, 2017-2019 40 foot E2, 2020-2021 35 foot RR, 2019-2020 40 foot RR, 2019-2022 40 foot ZX5, and 2020-2022 35 foot ZX5 buses. The plexus adhesive between the torque limiter plate and the bus body may be insufficient, causing the bolts that secure the steering gearbox to loosen.

 

Remedy

Dealers will install a mechanical fastener and new bolts on the steering gearbox, and install a new torque plate, as necessary, free of charge. Owner notification letters were mailed October 7, 2022. Owners may contact Proterra’s customer service at 1-864-438-0000.

 

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.nhtsa.gov.

 


STEERING GEARBOX TORQUE STRIPE AND RE-TORQUE FLEET CHECK

Retrofit Description:

This fleet check is to verify that the Steering Gear mounting bolts have maintained securement. Loss of securement may indicate that the plexus adhesive layer may be insufficient between the torque plate and the chassis. If the vehicle fails this inspection, then further invasive testing can be done to evaluate the adhesive layer. This procedure verifies the Steering Gearbox securement bolt torque. It is the same process used to verify this torque during regular preventative maintenance checks of the suspension.

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Chronology :

In December 2021, Proterra received a customer report of a steering gearbox failure. Proterra investigated and determined the root cause of this failure was the same as the root cause of two 2020 incidents of loose steering gearbox bolts. The 2020 incidents led Proterra to declare a voluntary safety recall (20V-664) in October 2020 on 169 vehicles. The vehicle in the December 2021 report was not one of the 169 vehicles included in the 20V-664 campaign.

In January 2022, Proterra’s Quality Compliance Steering Committee met and determined further investigation of this issue was warranted.

On February 21, 2022, the Committee reviewed the investigation findings, including the supplier’s production records related to the amount of plexus adhesive applied to the torque limiter plate. The Committee decided to conduct a voluntary safety recall to address this issue.

As of February 21, Proterra knows of no crashes, injuries, or fatalities associated with this issue.

 


10 Affected Products

Vehicles

MAKE MODEL YEAR
PROTERRA CATALYST 2017-2022
PROTERRA ZX5 2019-2022

 


9 Associated Documents

Defect Notice 573 Report

RCLRPT-22V114-3001.PDF 214.808KB

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Recall 573 Report- 03/08/2022

RCLRPT-22V114-3064.PDF 214.816KB

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Recall Acknowledgement

RCAK-22V114-8751.pdf 646.373KB

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Recall 573 Report- 03/09/2022

RCLRPT-22V114-3731.PDF 215.285KB

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Remedy Instructions and TSB

RCRIT-22V114-5202.pdf 973.915KB

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ISSUED Interim Owner Notification Letter(Part 577)

RIONL-22V114-0573.pdf 160.321KB

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Recall 573 Report- 04/22/2022

RCLRPT-22V114-4125.PDF 215.301KB

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Recall Quarterly Report #1, 2022-4

RCLQRT-22V114-8243.PDF 211.134KB

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ISSUED Owner Notification Letter(Part 577)

RCONL-22V114-9902.pdf 147.701KB

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Latest Recalls Documents

For the Latest and Most Recent Recalls Information Visit the link below…

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=22V114&docType=RCL

 


 

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