P1610
Lock Mode — NATS Immobilizer Malfunction
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The P1610 code on Nissan vehicles means the NATS (Nissan Anti-Theft System) immobilizer has entered lock mode, preventing the engine from starting. This is an anti-theft security feature — when the system doesn't recognize the key or encounters communication errors between security components, it disables the fuel injectors and ignition system after multiple failed start attempts. The engine will crank normally but won't fire.
This code often appears suddenly and can be caused by something as simple as a weak key fob battery or a low vehicle battery. Before panicking, try this reset procedure: insert a known registered key, turn the ignition to ON (don't crank), wait 5 seconds, then turn back to OFF. Repeat this process 3–5 times. Also check your vehicle battery — low voltage is a common trigger for NATS communication failures.
If the reset procedure doesn't work, you'll likely need a Nissan dealership or a qualified automotive locksmith with Nissan NATS programming capability. Key reprogramming costs $50–$250 depending on the number of keys. If the immobilizer control unit or NATS antenna has failed, repair costs can reach $300–$600. This is generally not a DIY repair since specialized diagnostic equipment is required to reprogram the immobilizer system.
Severity
Symptoms
- •Engine cranks but will not start
- •Security or key warning light is flashing on the dashboard
- •No spark and no fuel pressure when cranking
- •Vehicle was previously running fine
- •Key fob battery may be low or dead
- •Anti-theft system indicator stays on solid or flashes rapidly
Likely Causes
The ignition key's transponder chip is not recognized by the NATS immobilizer system, either because the key is not programmed to the vehicle or the transponder has failed. The system locks out after 5 failed start attempts.
The ring antenna around the ignition cylinder that reads the key's transponder signal has failed or has a poor connection, preventing key recognition.
Communication between the Engine Control Module and the Immobilizer Control Unit (IMMU) has been disrupted by wiring faults, connector corrosion, or module failure.
A weak or dying vehicle battery does not provide enough voltage for reliable communication between the immobilizer components, causing the system to default to lock mode.
Estimated Cost
Professional Repair
Includes parts + labor
Common Fixes
- Try the key reset procedure: turn ignition ON with registered key, wait 5 seconds, turn OFF, repeat several times
- Replace the key fob battery and retry starting
- Have keys reprogrammed at a Nissan dealership
- Check battery voltage and charge or replace if low
- Replace NATS antenna amplifier or immobilizer control unit if faulty