The M56 offered both traditional key and smart key options simultaneously depending on trim level, creating two parallel key systems within the same model year.

Mid-Generation Refresh

Infiniti refreshed the M56's key system mid-generation, updating the FCC ID and fob design while maintaining backward compatibility with the same vehicle platform.

Integrated Fob Design

Infiniti consolidated all key functions into a single sleek fob for the M56 — remote lock/unlock, proximity start, trunk release, and remote start in one unit with no separate pieces.

First Smart Key Rollout

The M56 received smart key as an option on higher trims during this period. Base models continued with traditional keys while top trims got push-button start and proximity entry.

Which Key Does Your M56 Have?

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Standard Transponder

Basic key with a chip — turns in the ignition like a traditional key but contains a transponder that must match the immobilizer. No remote functions. The simplest and least expensive key type to replace.

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Switchblade Key

Another name for a flip key — the blade swings out of the fob body like a switchblade knife. Same function as a flip key: folds for portability, flips out for the ignition.

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Metal Key Only

The earliest Infiniti M56 models used plain metal keys with no chip, no remote, no transponder. A hardware store could duplicate these. No programming needed — purely mechanical.

Infiniti M56 Key Pricing

Flat-rate pricing for every M56 key type. No hidden fees.

Key Type

EZ Car Keyz

Infiniti Dealer

Smart Key

$296-$308

$549-$567

Infiniti Key -Tap to Call

The Smarter Way to Replace a M56 Key

Getting a M56 key at the dealer means leaving your car for the day. Our mobile service means you keep your car and get a key in 30 minutes.

EZ Car Keyz

Infiniti Dealer

Wait Time

25 min on site

3-7 day appointment

Location

We come to you

You tow to dealer

After Hours

6AM-11:30PM daily

M-F 9-5 only

All Keys Lost

No problem

Tow required

Pricing

40-60% less

Full markup

Skip the Dealer — Call (619) 876-1271

Common Infiniti M56 Key Issues

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M56 Immobilizer Light Stays On

A solid or flashing immobilizer light (key icon) on your Infiniti M56 dashboard means the car does not recognize the key's transponder. This can happen with a new unprogrammed key, a failing key, or an immobilizer system fault. Call {PHONE} for on-site diagnosis.

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M56 Cranks But Will Not Start

If the engine cranks but will not fire, the immobilizer may not be recognizing the transponder chip in your key. This can happen with aftermarket keys that were not properly programmed or with keys that have been damaged. A locksmith can diagnose whether the key is the issue.

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Trunk Release Button Not Working on M56 Fob

The trunk release button on Infiniti M56 fobs typically requires a long press (2+ seconds) for safety. If it still does not work after a long press, the button contact inside the fob may be worn. We can replace the fob shell or the entire fob.

Can You Program a M56 Key Yourself?

No — Pro Required

Infiniti M56: This model uses encrypted smart key communication that requires server-authenticated programming. No DIY or on-board method exists.

No — Pro Required

Infiniti M56: Self-programming was disabled starting this model year. Previous years of the M56 allowed it, but Infiniti removed the capability as a security measure.

No — Pro Required

Infiniti M56: Due to enhanced security protocols, all key programming must go through OBD-II with PIN authentication. This applies to both key addition and all-keys-lost scenarios.