Nissan
ECM 5-volt sensor power supply shorted high. Several sensors (pedal, throttle, crank, A/C pressure) can fail at once; may go into limp mode.
P0643 fault code: what it means
P0643: ECM 5-volt sensor power supply shorted high. Several sensors (pedal, throttle, crank, A/C pressure) can fail at once; may go into limp mode.
Usual causes, most likely first
- short in a sensor sharing the 5 V supply (APP, TP, CKP, refrigerant pressure)
- chafed wiring
- ECM fault
P0643 by make
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 P0643 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.