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P1612 fault code: what it means

P1612: Nissan immobiliser: communication fault between the ECM and the immobiliser unit; may not start.

Engine and gearbox (powertrain) · Minor

Usual causes, most likely first

  1. wiring or connector between ECM and immobiliser
  2. immobiliser unit fault
  3. ECM/immobiliser not matched

P1612 by make

Nissan

Nissan immobiliser: communication fault between the ECM and the immobiliser unit; may not start.

Usual causes: wiring or connector between ECM and immobiliser; immobiliser unit fault; ECM/immobiliser not matched

Not sure what P1612 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.