Nissan P1610 Code: NATS Lock Mode (Immobilizer)
After repeated failed immobilizer checks, the Nissan ECM has locked itself and won't let the engine start.
Stop driving
The car won't start while lock mode is active, so there is nothing to drive. Stop cranking over and over; each extra attempt only drains the battery and doesn't release the lock.
At a glance
Severity: Moderate
- Meaning
- NATS Lock Mode (Immobilizer)
- System
- ECU & Outputs · Powertrain
- Safe to drive?
- No — stop driving
- Typical repair cost
- $0–$450
- DIY difficulty
- Easy
NATS, the Nissan Anti-Theft System, lets the engine start only after the key's transponder ID has been verified and the immobilizer unit (or the BCM on later models) has confirmed that to the ECM. If the engine is cranked five or more times in a row while that check fails, whether because of an unregistered key or a communication problem, the ECM goes into lock mode and stores P1610. From then on it refuses to start even with the correct key, until the lock is released. P1610 is therefore almost always a consequence: something else caused the failed checks, and those codes (often P1614 or P1612) are the real diagnosis. Nissan describes a simple release routine that often gets the car running again once the underlying problem is gone.
Try this first – 5-minute fix
- Charge the battery first Check battery voltage; below about 12.4 V at rest, charge it or connect a charger. A weak battery can make the ID check fail again right after you release the lock.
- Use one registered key on its own Take the original or a known-good registered key off the key ring, away from other transponder keys, fobs and access cards.
- Run the lock-mode release routine Ignition OFF. Turn the ignition ON with the registered key without starting and wait 5 seconds, then back to OFF and wait 5 seconds. Do this three times in total, then try to start.
- Still no start? Read the other codes If the engine still won't fire, P1610 is being caused by an unresolved fault. Read the ECM and BCM/immobilizer codes and follow P1614 or P1612.
How to read P1610
- P Powertrain
- 1 Manufacturer-specific
- 6 Computer & outputs
- 10 Specific fault
Symptoms
- Engine cranks normally but never fires
- Security indicator on the dash stays lit with the ignition on
- Problem started after several tries with a new, copied or spare key
- Other immobilizer codes such as P1614 or P1612 stored as well
- Battery going flat from repeated cranking
Possible causes
Ranked by how often each cause is behind this code (editorial estimate).
- Several start attempts with a key that isn't registered to this car (new, copied or from another vehicle)
- Transponder in the key not being read (see P1614), causing repeated failed checks
- Communication failure between ECM and immobilizer or BCM (see P1612)
- Low battery voltage during cranking interrupting the ID check
- ECM, BCM or immobilizer unit replaced or swapped without registration
- Aftermarket remote starter or alarm interfering with the immobilizer
Diagnosis step by step
Read every module
Read the ECM and the BCM or immobilizer unit with a Nissan-capable scan tool. P1610 tells you only that the ECM locked; the other codes explain why. Note whether U1000 or other network codes are present.
Tools: OBD-II scanner
Watch the security indicator
With the ignition off, the security light blinking slowly is normal. If it stays on solid after the ignition is switched on, NATS has detected a fault. This quick check tells you whether you are dealing with an immobilizer problem at all.
Tools: Flashlight
Check battery and grounds
Measure battery voltage while cranking; it should not dip much below about 9.6 V. Clean the battery terminals and engine ground so the modules stay awake through the ID check.
Tools: Multimeter
Release lock mode and test
After fixing the root cause, clear P1610 with a scan tool if possible and perform the ON-5 seconds, OFF-5 seconds routine three times. Then start with the registered key.
Tools: OBD-II scanner
Register keys if needed
If the key or a module is new, keys must be registered with a Nissan-capable tool and the car's security code. Registration usually erases all previously stored keys, so bring every key you want to keep.
Tools: OBD-II scanner
Where the parts are
- 1Battery
- 2Alternator
- 3Engine computer (ECM)
- 4CAN bus
- 5Transmission
- 6Wheel speed sensor
- 7High-voltage battery
Repair options & costs
| Repair | DIY? | Estimated cost |
|---|---|---|
| Lock-mode release routine | Yes | $0 |
| Charge or replace 12 V battery | Yes | $0–$280 |
| Program existing keys (locksmith or dealer) | No | $100–$300 |
| New key cut and programmed | No | $150–$400 |
| Register replacement ECM or BCM to NATS | No | $150–$450 |
Rough US estimates for parts and labor; shop rates vary by region. Not a quote.
Emissions / smog test impact
Depends
Immobilizer codes don't normally light the check engine light, but the vehicle obviously can't be tested until it starts. Clearing codes also resets readiness monitors, so drive for a few days before a smog check.
Frequently asked questions
Will disconnecting the battery clear lock mode?
Not reliably. The ECM remembers the lock. Use the ignition ON/OFF release routine or clear the code with a scan tool, and fix the reason for the failed checks first.
Why did lock mode happen after I bought a cheap spare key?
A copied or blank key isn't registered in the car's immobilizer. Trying it repeatedly counts as failed ID checks, and after five attempts the ECM locks. The key has to be registered with a Nissan-capable tool.
Can a dealer or locksmith fix this without replacing parts?
Often yes. If the only problem was an unregistered key or a weak battery, releasing the lock and registering the keys is all it takes.
Sources
- Manufacturer public service information (cross-checked)
- Methodology: How We Build Code Pages · Data Sources We Use · Editorial Policy