The zinc plating operation performed on the upper steering column shaft coupling bolt caused hydrogen embrittlement and breakage of the bolt.
Risk: Fractures of the upper steering column shaft couplingbolt result in a lack of coupling load on the shaft and loss of steeringcontrol.
Remedy: Replace the zinc plated bolt with a phosphate plated bolt.
Concerns: Chrysler Fifth Avenue Series Y (Model years 1992) · Chrysler Imperial VII (Model years 1992) · Chrysler LeBaron III (Model years 1992) · Chrysler minivan (Model years 1992) · Dodge Caravan II (Model years 1992) · Dodge Daytona (Model years 1992) · Dodge Dynasty (Model years 1992) · Dodge Shadow (Model years 1992) · Dodge Spirit (Model years 1992) · Plymouth Acclaim (Model years 1992) · Plymouth Sundance (Model years 1992) · Plymouth Voyager II (AS) (Model years 1992)
Sources: NHTSA (United States, public domain), Transport Canada (Open Government Licence – Canada), DVSA (United Kingdom, Open Government Licence v3.0), RappelConso and EU Safety Gate (France, Licence Ouverte 2.0).