EN

Severity: Moderate Code type: Manufacturer-specific (Nissan)

Nissan P1614 Code: Chain of IMMU–Key (Transponder Not Read)

The Nissan immobilizer couldn't read the transponder chip in the key, so the engine isn't allowed to start.

At a glance

Severity: 3/5 – Moderate3/5

Severity: Moderate

Meaning
Chain of IMMU–Key (Transponder Not Read)
System
ECU & Outputs · Powertrain
Safe to drive?
With caution
Typical repair cost
$0–$950
DIY difficulty
Easy

Every Nissan NATS key with a mechanical blade has a small passive transponder chip in its head. When you turn the key, a coil-shaped antenna amplifier around the ignition lock cylinder energizes that chip and passes its ID to the immobilizer unit or BCM. P1614 means that chain broke: the immobilizer got no valid answer from the key. The problem is on the key side of the system, meaning the chip, the antenna ring and its wiring, or interference from other keys, rather than the link to the ECM. The chip needs no battery, so a dead remote battery is not the cause. Push-button cars with an Intelligent Key use different codes for their key checks.

Can I keep driving? If the car starts, it will keep running, but it may leave you stranded on the next start. Carry the spare key and get it diagnosed soon.

Try this first – 5-minute fix

  1. Try the spare key Start with a second registered key. If it starts every time, the first key's transponder is the problem and the key needs replacing and registering.
  2. Take the key off the ring Remove other car keys, fobs, garage transponders and metal covers, and keep RFID cards away from the column. Try starting with the key on its own.
  3. Release lock mode if it set If P1610 appeared too, turn the ignition ON with a registered key for 5 seconds and OFF for 5 seconds, three times in total, then start.

How to read P1614

How to read P1614P11263144
  1. P Powertrain
  2. 1 Manufacturer-specific
  3. 6 Computer & outputs
  4. 14 Specific fault

Symptoms

  • Engine cranks but won't fire with one key, while the spare works
  • Security indicator stays on after switching the ignition on
  • Starts only after several attempts or after wiggling the key
  • Trouble began after the key was dropped or put in a new shell
  • P1610 lock mode after repeated attempts

Possible causes

Ranked by how often each cause is behind this code (editorial estimate).

  1. Transponder chip damaged, loose or missing in the key head (dropped key, cracked or replaced shell) 30%
  2. NATS antenna amplifier ring around the ignition cylinder failing 20%
  3. Interference from other transponder keys, fobs, RFID cards or a metal key cover near the ignition 18%
  4. Antenna amplifier wiring, connector or fuse fault 12%
  5. Key not registered to this car (copied or second-hand key) 10%
  6. Immobilizer unit or BCM fault 6%
  7. Remote starter bypass module failing 4%

Diagnosis step by step

Diagnostic flow: P16141Compare keys2Inspect the key head3Check the antenna ring4Measure power, ground and signal5Register keys correctly

  1. Compare keys

    Read codes from the ECM and BCM/immobilizer, clear them and test every key you have. One key failing points to that key; all keys failing points to the antenna ring, its wiring or the immobilizer.

    Tools: OBD-II scanner

  2. Inspect the key head

    Open the key shell if it comes apart and check that the small glass or plastic transponder capsule is present and not cracked. Aftermarket shells often arrive without a chip, and swapping the blade into one loses the original.

    Tools: Screwdriver

  3. Check the antenna ring

    Remove the steering column covers and look at the antenna amplifier ring on the lock cylinder. Make sure it sits properly and its connector is latched and clean; a loose or cracked ring can read one key and not another.

    Tools: Screwdriver, Flashlight

  4. Measure power, ground and signal

    With the ignition on, the antenna amplifier connector should show battery voltage on its supply pin and a solid ground. Check the fuse feeding it and the continuity of the signal wire to the immobilizer or BCM.

    Tools: Multimeter

  5. Register keys correctly

    New keys must be cut and then registered with a Nissan-capable tool and the car's security code. Registration usually wipes all old keys, so bring every key you want to keep working.

    Tools: OBD-II scanner

Where the parts are

Ignition: coils and spark plugs per cylinder – P16141234567
Ignition: coils and spark plugs per cylinder
  1. 1Ignition coil
  2. 2Spark plug
  3. 3Fuel injector
  4. 4Camshaft sensor
  5. 5Crankshaft sensor
  6. 6Engine computer (ECM)
  7. 7Intake manifold

Repair options & costs

RepairDIY?Estimated cost
Remove interference (keys, fobs, covers) Yes $0
Transfer original chip to a new shell Yes $20–$80
New key cut and registered No $150–$380
Replace NATS antenna amplifier ring No $150–$380
Replace and register immobilizer unit or BCM No $400–$950

Rough US estimates for parts and labor; shop rates vary by region. Not a quote.

Emissions / smog test impact

Depends

P1614 normally doesn't turn on the check engine light, so it won't fail an emissions test by itself; the car simply has to start for the test.

Frequently asked questions

Could a dead key fob battery cause P1614?

No. The transponder chip is passive and powered by the antenna ring when you turn the key. A dead fob battery only stops the remote lock buttons from working.

Why does my spare key work but not my main key?

Then the main key's chip is damaged or missing. Keys that are dropped often, or moved into cheap replacement shells, are typical cases. Replace and register that key.

Can I program a new key myself?

Not on most NATS systems. Registration needs Nissan-capable software and the car's security code, and it usually erases all existing keys, so a locksmith or dealer should do it with all keys present.

Sources