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Error Code P1610 – Lock Mode

The error code is P1610 It is defined as lock mode. This code is activated when the starting operation is performed consecutively five or more times with an unregistered ignition key or a malfunctioning key.

This error code is a manufacturer-specific fault code, meaning it does not apply to all makes of vehicles. Rather, it applies only to specific vehicle brands, such as Mitsubishi, Nissan, etc.

The specifications on the definition, troubleshooting and repairs continue to vary from one make and model to another.


Nissan vehicles come with an immobilizer feature, it is an electronic device installed in the vehicle, which prevents the engine from starting and running unless the correct key is inserted. This prevents car theft since the vehicle cannot be connected after entry.

Reads: Error Code P1340 – CKP/CMP Sensor Signals Out of Sequence (Audi, VW)

It has a microcircuit inside the key that is activated by a small electromagnetic field that induces the flow of current within the body of the key.

This process allows the key to emit a binary code that is read by the vehicle’s PCM (powertrain control module, also known as ECM or engine control module in other makes of vehicles) when it is turned.

When the PCM determines that the coded key is current and valid, the PCM will automatically activate the fuel injection sequence.


This immobilization function is called IVIS or Infiniti Vehicle Immobilizer System, also known as Nissan Anti-Theft System or NATS.

It consists of the special ignition key, the antenna lamp located in the ignition key cylinder, the body control module (BCM, also known as IMMU), the PCM, and the safety indicator lamp.

The error code P1610 It occurs when an unregistered or damaged key is used to start the engine five or more consecutive times, resulting in the system locking up and the vehicle being unable to be driven.

Common symptoms

Like other error codes, this code triggers the light Check Engine and registers the code in the vehicle system. And since it is a lock mode code, the vehicle cannot be driven as there will be no starting.

Possible causes

There are a couple of reasons for this error code, namely:

  • Faulty or unprogrammed ignition key.
  • IMMU (body control model) failure
  • PCM failure

How to check it

As stated above, this code is activated when the wrong or damaged key is used to start the engine five or more times, consecutively. When this happens, disconnect the battery for about 30 minutes and then try starting the engine with a known registered key.

If the problem persists, your key must be reprogrammed and the dealer must clear the code. This means you have to take the vehicle to your dealer.

How to solve it

As stated above, simply disconnecting the battery for 30 minutes and then trying to start again with the correct key will fix this problem. If the problem persists, try the following:

  • Turn off the power switch
  • Turn on the ignition switch with the registered key (the engine will not start yet). Wait 5 seconds
  • Return the key to the Off position
  • Repeat steps 2 and 3 twice (for a total of 3 cycles)
  • Start the engine

If the problem persists, take your vehicle to the dealership to have your certified technician reprogram your key and erase the fault code of your system.

If you want to know other articles similar to Error Code P1610 – Lock Mode you can visit the category Fault Codes.


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