2011 Acura MDX
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Q: How long should a replacement MDX flip key last?

Electronics wise, the ID46 chip does not “wear out.” Once it is registered in the immobilizer system, it stays learned unless you erase it with a scan tool. What does wear is the housing. The 2011 MDX flip key uses a CR1616 battery and a sidewinder blade in the HO01 profile . After years in a pocket, the pivot pin can loosen and the rubber button pad can split. I can usually transfer a good circuit board into a fresh shell without reprogramming as long as the transponder and remote board are still healthy.

Q: What if the new key works, then stops locking the doors?

Short answer. It might not be the immobilizer at all. On this MDX, the remote door lock portion can be placed into programming mode through an ignition sequence that wipes all stored remotes and relearns them . If someone reprograms another fob and does not add yours in the same session, yours gets dropped from memory. The transponder side can still start the engine while the lock and unlock buttons do nothing. I test both functions before I leave so you are not guessing later.

Q: My MDX starts then dies and the green key flashes. Is that the key?

Blunt answer. That is classic immobilizer behavior. Acura documented cases on 2011 to 2013 MDX models where the engine starts and immediately shuts off with the green immobilizer indicator flashing . The issue can be tied to low system voltage, communication faults, or incomplete key registration, not just a “bad fob.” I scan for immobilizer DTCs such as B1177 or B1178 and check the status log before condemning the key . Swapping batteries blindly will not fix a control unit that is in a fault state.

Q: What is an immobilizer brake code on this MDX?

On Honda and Acura systems of this era, there is a VIN specific five digit “immobilizer brake code” available through the factory iN system . It is meant as a temporary start procedure when you have a cut key but the immobilizer has not authenticated it. It is not a shortcut around programming and it is controlled information. In most real world cases, properly registering the ID46 key with the right equipment is the permanent fix.

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2011 Acura MDX Remote flip key Replacement - Fast, Affordable & Professional

I got the call in Moorpark, right by Tierra Rejada Open Space. A tire shop owner had a 2011 Acura MDX stuck in his lot.

Another locksmith had tried to program a replacement key. Halfway through, their tool lost communication. After that, the MDX would crank, fire for a second, then shut off. The green immobilizer key light on the dash kept flashing.

Acura has an iN message logged under SB-10053752-4917 about 2011 to 2013 MDX vehicles with intermittent start and immediate shut off tied to the immobilizer system . When voltage dips or the registration sequence gets interrupted, the immobilizer status log can stack counts and the system refuses to authenticate the key.

First thing I did was stabilize battery voltage. Low voltage is a known trigger for immobilizer DTCs like B1177 for abnormal battery voltage and B1178 tied to the immobilizer control unit . Then I cleared the stored codes and ran a clean key registration through the diagnostic port.

No rushing. No clicking around guessing.

Once the new key registered properly, the MDX started and stayed running. I cycled it a few times just to be sure. The shop owner just nodded when it idled steady. Way better than lining up a tow and waiting on a dealer schedule.

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Do you use OEM or aftermarket keys on a 2011 MDX?▼

For the 2011 MDX, the genuine key is listed by Acura as “Key, Immobilizer & Transmitter (Blank)” with part numbers like 35111-STX-329 for Driver 2 . It uses a Philips ID46 transponder chip, also known in the trade as a Hitag2 or PCF7936 crypto chip . I can supply genuine or high quality aftermarket, but the key has to match the FCC ID N5F0602A1A and the correct memory slot. Cheap online keys sometimes show up with locked or incorrect transponders that will not register without reconditioning . I verify compatibility before I ever cut it.

How long should a replacement MDX flip key last?▼

What if the new key works, then stops locking the doors?▼

My MDX starts then dies and the green key flashes. Is that the key?▼

What is an immobilizer brake code on this MDX?▼

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