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P1611 fault code: what it means

P1611: Immobiliser ID mismatch between the ECM and BCM (NATS). Engine will not start or stalls after starting.

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

  1. BCM or ECM replaced without registration
  2. key/ID registration lost
  3. BCM or ECM fault

P1611 by make

Nissan

Immobiliser ID mismatch between the ECM and BCM (NATS). Engine will not start or stalls after starting.

Usual causes: BCM or ECM replaced without registration; key/ID registration lost; BCM or ECM fault

Not sure what P1611 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.