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P0028 fault code: what it means

P0028: EJ25 SOHC (i-AVLS) intake valve lift control on the left head is not responding as expected. Same system as P0026 on the other side.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. low engine oil or oil pressure
  2. faulty AVLS oil pressure switch
  3. clogged or faulty AVLS solenoid
  4. wiring or connector fault

P0028 by make

Subaru

EJ25 SOHC (i-AVLS) intake valve lift control on the left head is not responding as expected. Same system as P0026 on the other side.

Usual causes: low engine oil or oil pressure; faulty AVLS oil pressure switch; clogged or faulty AVLS solenoid; wiring or connector fault

Not sure what P0028 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.