Audi
Sensor 5 V supply A is too low. Several sensors drop out at once; often one shorted sensor pulls the supply down.
P0642 fault code: what it means
P0642: Sensor 5 V supply A is too low. Several sensors drop out at once; often one shorted sensor pulls the supply down.
Usual causes, most likely first
- shorted sensor on the 5 V supply (boost, cam, fuel pressure)
- chafed sensor wiring
- engine computer fault
P0642 by make
Skoda
Sensor 5 V supply A is too low. Several sensors drop out at once; often one shorted sensor pulls the supply down.
Volkswagen
Sensor 5 V supply A is too low. Several sensors drop out at once; often one shorted sensor pulls the supply down.
What the repair usually costs
- High-pressure fuel pump (GDI petrol or common-rail diesel)NZ$1,140–NZ$4,280 · A$1,060–A$3,800
Not sure what P0642 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.