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P1023 fault code: what it means

P1023: Valvetronic adjustment range fault. Rough running; often after parts were replaced without re-learning.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. Valvetronic adaptation not learned
  2. worn motor or shaft
  3. faulty eccentric shaft sensor

P1023 by make

BMW

Valvetronic adjustment range fault. Rough running; often after parts were replaced without re-learning.

Usual causes: Valvetronic adaptation not learned; worn motor or shaft; faulty eccentric shaft sensor

Mini

Valvetronic adjustment range fault. Rough running; often after parts were replaced without re-learning.

Usual causes: Valvetronic adaptation not learned; worn motor or shaft; faulty eccentric shaft sensor

Not sure what P1023 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.