P1055 fault code: what it means

P1055: Valvetronic motor supply voltage too high.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

Valvetronic relay fault
wiring short

P1055 by make

BMW

Valvetronic motor supply voltage too high.

Usual causes: Valvetronic relay fault; wiring short

Mazda

SKYACTIV-D cylinder 3 injection quantity too low. Rough idle or knock; often injector wear.

Usual causes: fuel injector No.3 wear or sticking; low fuel or air in fuel; input sensor fault

Mini

Valvetronic motor supply voltage too high.

Usual causes: Valvetronic relay fault; wiring short

What the repair usually costs

Parking sensor replace, one sensorNZ$130–NZ$520 · A$130–A$510
Petrol fuel injectors (port injection, set)NZ$430–NZ$1,420 · A$400–A$1,360

Not sure what P1055 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.