Reconditioned Audi A4 2.0 TDI Gearbox

A4 2.0 TDI: 12 engine codes, a single family of 6-speed manual gearbox — but not a single reference

Unlike other diesel engines in the A4 range that have been offered with both manual and automatic options depending on the year, the A4 2.0 TDI (2004–2015) is fitted exclusively with a 6-speed manual gearbox. There is no DSG or automated manual variant within this scope. The complexity therefore lies not in choosing the transmission type, but in pinpointing the correct reference among the 12 engine codes on record: BLB, BRD, BRE, BVG, CAGA, CAGB, CAGC, CAHA, CAHB, CGLC, CJCA, CJCB.

Why the engine code is the only reliable reference

Over eleven years of production, the 2.0 TDI evolved across several engine generations. The codes in the BLB / BRD / BRE / BVG series correspond to the earliest versions (mid-2000s), while the codes CAG_ / CAH_ / CJC_ / CGLC identify the blocks from later generations. Two vehicles with the same engine capacity, the same stated power output and the same apparent model year can carry gearboxes with different references depending on their exact engine code. The engine identification plate or the manufacturer's documentation remain the only way to avoid an ordering error.