2010 INFINITI EX35 ECM: A Guide to Part Numbers, Programming, and Immobilizer Issues

Symptoms of a Failing 2010 EX35 ECM

A failing Engine Control Module can cause a wide range of confusing and intermittent problems. Because the ECM controls so many different functions, symptoms can sometimes appear unrelated to the engine itself. Diagnosing a bad ECM often involves ruling out other possibilities like faulty sensors or wiring first.

• Check Engine Light: This is the most common symptom. An ECM failure can trigger a variety of Diagnostic Trouble Codes (DTCs). Often, you may see a flood of codes for multiple different sensors at once.
• Engine Performance Issues: You may experience engine misfires, a rough idle, stuttering, hesitation on acceleration, or a sudden loss of power. In some cases, the vehicle may enter a "limp mode" with drastically reduced power.
• No-Start or Hard Starting: The engine may crank but refuse to start, or take much longer than usual to fire up. This can happen if the ECM is not properly commanding the fuel injectors or ignition coils to fire. A key indicator of an immobilizer-related ECM issue is when the car cranks but won't start, and the red security light on the dashboard stays solid.
• Poor Fuel Economy: If the ECM can no longer correctly manage the air-fuel mixture, you may notice a sudden and significant drop in gas mileage.
• Erratic Shifting: The ECM communicates with the Transmission Control Module (TCM) to ensure smooth shifting. A faulty ECM can send bad data, leading to harsh, delayed, or unpredictable gear changes.
• Immobilizer Fault Codes: Specific codes like P1610, P1611, P1612, P1613, P1614, or P1615 point directly to a problem with the Nissan Anti-Theft System (NATS), often triggered by an ECM replacement or failure.

Known Issues, TSBs, and Recalls

As of mid-2026, there are no active recalls issued by the National Highway Traffic Safety Administration (NHTSA) for the Engine Control Module itself on the 2010 INFINITI EX35. Recalls for this model year primarily concern Takata airbags and an aftermarket trailer hitch.

However, Infiniti has issued Technical Service Bulletins (TSBs) for similar models that involve reprogramming the ECM to fix performance issues. For example, TSB ITB12-064a was released for the 2011 EX35 and other models to address harsh downshifts and acceleration lag by updating the ECM and TCM software. This confirms that updated software versions are available and can resolve drivability complaints without replacing the entire module.

Buying a Used Engine Control Module

Purchasing a used OEM ECM is a cost-effective way to get your EX35 back on the road, but it requires careful attention to detail. Given the complexity of the electronics, a used original part is often more reliable than a new, unproven aftermarket unit.

1. Match the Part Number Exactly: This is the most critical step. Infiniti used several different ECMs for the 2010 EX35 based on the vehicle's specific options. You must match the OEM part number from your original module to the used one you are buying. Part numbers can be found on a sticker on the module's case and often start with '23710'. Known compatible part numbers include 23710-1BU8C, 23710-1BU9A, 23710-1BU9B, and 23710-1BU9C, among others.
2. Verify Vehicle Options: Pay close attention to your vehicle's configuration. There are specific ECMs for models with All-Wheel Drive (AWD) and the factory navigation system, particularly for vehicles built from April 2010 onwards. Using an ECM from a RWD model in an AWD model, or vice-versa, will cause system conflicts.
3. Inspect for Damage: When you receive the used module, inspect it carefully for any signs of physical damage, corrosion on the pins, or evidence of water intrusion. The ECM is located in a relatively protected area behind the glove box, but leaks can still happen.
4. Budget for Programming: A used ECM is not a plug-and-play part. It absolutely will not work until it is programmed to your vehicle's immobilizer system. Factor the cost of programming by a dealer or specialist into the total price.

Programming and Immobilizer Synchronization

This is the most important and often overlooked step of replacing an EX35's ECM. Your vehicle is equipped with the Nissan Anti-Theft System (NATS), also called the Infiniti Vehicle Immobilizer System (IVIS). This system requires the ECM, Body Control Module (BCM), and your ignition keys to all be registered to each other. When you install a different ECM, this security chain is broken, and the car will not start.

Who Can Program the ECM?

• Infiniti Dealerships: They have the proprietary CONSULT-III Plus scan tool and access to the security system required to perform the key and ECM registration. This is the most reliable, though often most expensive, option.
• Specialized Automotive Locksmiths: Many modern locksmiths have advanced tools that can communicate with the NATS/IVIS system to program keys and modules. They are often a more affordable option than the dealer.
• Advanced Independent Repair Shops: Some independent shops invest in high-end diagnostic tools (like certain Autel or Snap-on models) that have the capability to perform immobilizer functions on Nissan and Infiniti vehicles.

Can I Do It Myself?

For the 2010 EX35, DIY programming is extremely difficult and not recommended. The process requires specialized software, a specific OBD-II interface, and access to a PIN code calculator that deciphers a code from the BCM. An error in this process can potentially disable the vehicle completely, requiring a tow to the dealer. It is safer and more effective to have this done by a professional.

Cost to Replace a 2010 EX35 ECM

Frequently Asked Questions (FAQ)