The automaker may have used an incorrect calculation method to report diesel emissions levels.
Volkswagen has reportedly suspended deliveries of its T6 diesel van over a potential problem with emissions reporting.
A Spiegel report suggests the automaker may have used an incorrect calculation method to report results of emissions tests, resulting in higher nitrogen-oxides levels than permitted by Germany's vehicle registration authority.
The discrepancy is said to have been discovered after the company reviewed test results and found emissions output levels that did not align with certification specifications.
The observations closely align with findings that exposed VW's 'defeat device' in millions of TDI vehicles. The German report suggests the T6 van problem is instead related to reporting methodology, however, as VW allegedly used an incorrect correction value in calculating emissions levels.
Facing a potential decertification move, VW is said to have voluntarily stopped deliveries as the company collaborates with authorities to find a solution.