"The season's over for us because we have already used our disposable round.
"We will get it fixed, but the timeframe to do that by round four next weekend is too short.
"It's pretty gutting for this to happen in the season we are defending our title."
The next round is in Counties, followed by Masterton just two weeks later.
In the points, drivers can drop off their worst result from the final tally.
Auret said he wanted to get the truck back up and running by the time of Cowper's private Extreme 4x4 Challenge, held on his farm property in Turakina in early April.
Last year was the inaugural competition, which was covered by TV3's CRC Motorsport. Auret said this year the TV company will film the action again.