"Customers have been advised in accordance with the regulations governing recalls," Chrysler spokesman Eric Mayne told Reuters via email. "We are continually replenishing our supply of replacement parts. Chrysler Group regrets any inconvenience our customers may have experienced."
NHTSA disagrees, arguing that the recalls, which affect 972,000 trucks from 2003 to 2012, are being delayed by the lack of parts.
"We have concerns with the administration and execution of these safety recalls and accordingly have opened an investigation to collect further information from Chrysler about the details of administration and execution of these campaigns and the logic that supports the strategies used," NHTSA wrote in a letter to Chrysler earlier this month, Reuters reports.
Over 1,000 consumers complained to NHTSA, prompting the probe, according to documents acquired by Reuters. Customers claimed that they attempted to have the recall work performed after Chrysler announced repairs would begin in January, only to be told by dealers it could take months for parts to become available.