Environmental regulators have given Volkswagen until Jan. 14 to gain approve for a diesel emissions repair plan relating to the automaker's 2.0L engine that used cheat software to evade emissions tests.

The California Air Resources Board (CARB) agreed to the extension in a letter to David Geanacopoulos, Volkswagen Group of America's executive vice president of public affairs and general counsel.

"As a result of VW's continued submission of additional significant information and data to CARB as part of VW’s proposed 2.0L influenced emission recall plan — including information VW submitted in writing on Dec. 14 and verbally as recently as Dec. 16 — CARB plans to act on your proposed 2.0L influenced emission recall plan on or before Jan. 14."

VW originally submitted a recall plan on Nov. 20 in response to the violations concerning illegal defeat devices in their 2.0L diesel-powered vehicles from the 2009-2015 model years. 

"Required elements of a recall plan include, but are not limited to, the projected timeline of the full recall process from initiation to completion (including how owners are located), the content of a company’s communications with them about the recall, and a plan for following up on the progress of the recall campaign," according to a CARB release. "The recall plan must set out the projected time to fix each vehicle."

Volkswagen's remedy must also address the safety, drivability, vehicle durability, and fuel efficiency of the cars involved, according to CARB.

To read the letter in full, click here. Read CARB's statement here.