Mitsubishi
CVT secondary pressure sensor fault. Judder, slip or limp mode possible.
P0840 fault code: what it means
P0840: CVT secondary pressure sensor fault. Judder, slip or limp mode possible.
Usual causes, most likely first
- secondary pressure sensor
- valve body
- wiring fault
P0840 by make
Nissan
CVT secondary pressure sensor (fluid pressure sensor A) fault. TCM loses pulley pressure feedback, so the CVT may judder, slip or go into limp mode.
What the repair usually costs
- CVT valve body replacement (remanufactured, in car)NZ$1,280–NZ$2,420 · A$1,200–A$2,400
- 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
Not sure what P0840 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.