P1850 fault code: what it means

P1850: Gearbox computer is not hearing from the engine computer. Limp mode is likely.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

blown control module fuse
data bus wiring fault
failed engine or gearbox module

P1850 by make

Audi

Gearbox computer is not hearing from the engine computer. Limp mode is likely.

Usual causes: blown control module fuse; data bus wiring fault; failed engine or gearbox module

Skoda

Gearbox computer is not hearing from the engine computer. Limp mode is likely.

Usual causes: blown control module fuse; data bus wiring fault; failed engine or gearbox module

Volkswagen

Gearbox computer is not hearing from the engine computer. Limp mode is likely.

Usual causes: blown control module fuse; data bus wiring fault; failed engine or gearbox module

What the repair usually costs

Automatic transmission rebuild, 6-speed and up (sent to specialist)NZ$7,190–NZ$13,080 · A$6,190–A$11,830
DSG / dual-clutch mechatronic unit replacement (new or reman)NZ$4,300–NZ$7,160 · A$3,750–A$6,390
DSG mechatronic repair / rebuild (unit sent to specialist)NZ$2,070–NZ$4,800 · A$1,890–A$4,250
Electronic throttle body replaceNZ$470–NZ$1,290 · A$440–A$1,190

Not sure what P1850 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.