2006 Infiniti G35 ECM: Decoding Part Numbers and Immobilizer Programming

Symptoms of a Failing 2006 G35 ECM

When the ECM begins to fail, it can cause a wide range of confusing and often intermittent issues. 🎬 Watch: 11 common symptoms of a bad ECM Because the ECM controls so many functions, symptoms can sometimes be mistaken for other problems. However, if you experience several of the following issues at once, the ECM is a likely culprit.

• Engine Will Not Start: This is the most severe symptom. The engine may crank but refuse to start, or it may not crank at all. This often happens because the ECM is not signaling the fuel injectors or ignition coils to fire.
• Unexpected Stalling: The engine may shut off unexpectedly while idling at a stoplight or, more dangerously, while driving.
• Poor Engine Performance: You may notice a significant loss of power, hesitation during acceleration, rough idling, engine misfires, or a sudden drop in fuel economy.
• Check Engine Light and Error Codes: An illuminated Check Engine Light is common. Key trouble codes pointing to ECM failure include P0605 (Internal Control Module ROM Error), U1000 (CAN Communication Circuit), and C1131 (Engine Signal 2). You may also see a flood of seemingly unrelated sensor codes at the same time.
• No Communication with Scan Tool: If a diagnostic scanner cannot connect to the ECM, it's a strong sign the module itself has failed.
🎬 See this video on signs of a failing ECU

Buying a Used 2006 G35 Engine Control Module

Purchasing a used ECM can save you a significant amount of money, but it requires careful attention to detail to ensure you get the right part. Failure to match the part correctly will result in a component that will not work in your vehicle.

Critical Compatibility Check: Production Date & Vehicle Type

The 2006 model year had a mid-year change for its electronics. The part numbers covered in this guide generally fit 2006 Infiniti G35 models produced on or before September 2005. The initial data suggests a specific fit for AWD Sedans, but parts sellers often list these part numbers for all 3.5L models from this period. The most reliable method is to ignore trim level and focus exclusively on matching the part number from your original module.

Match Your Part Number Exactly

The ECM is located behind the glove box on the passenger side of the vehicle. You will need to lower the glove box to access it. The part number is printed on a sticker on the module's case. Your replacement module must have the same OEM part number.

• Infiniti Part Numbers: 23710-CM32A, 23710-CM32B, 23710-CM32C (Note: B and C are often later revisions that supersede A)
• Hitachi Part Numbers: MEC61-010 C1, MEC61-012

Physical Inspection of a Used Unit

When buying a used ECM, inspect it for:

• No Physical Damage: Look for cracks in the casing or broken connector ports.
• Clean Pins: The connector pins should be straight and free of corrosion.
• Intact Seals: Check if the factory seals are broken, which could indicate it was opened and possibly tampered with.

Programming and Installation: This is Not Plug-and-Play

You cannot simply install a replacement ECM and start the car. It must be electronically synchronized with your vehicle's security system.

Why Programming is Required: The NATS Immobilizer

Your G35 is equipped with the Nissan Anti-Theft System (NATS). This system links the ECM, the Body Control Module (BCM), and your ignition keys. If you install a new or used ECM, the NATS system will not recognize it and will prevent the engine from starting as a security measure. You will almost certainly see immobilizer-related fault codes (P1610-P1615) if you attempt to start the car without programming.

Who Can Program Your Replacement ECM?

Programming requires specialized tools and software. You have a few options:

• Infiniti Dealership: This is the most reliable, albeit often most expensive, option. They use the proprietary CONSULT diagnostic tool to perform the programming.
• Qualified Independent Shop: Many independent repair shops that specialize in imports have the necessary equipment, such as a J2534 pass-through device and a subscription to Nissan's programming software (NERS).
• Mail-In Programming Service: Some companies allow you to purchase a used ECM and have them pre-program it with your vehicle's VIN before shipping it to you. This can make the installation "plug-and-play," though sometimes a final key registration procedure is still needed.
• Automotive Locksmiths: Most locksmiths can program keys, but programming a replacement ECM is typically beyond their capabilities.

Known Issues, Recalls, and TSBs

As of mid-2026, there are no active safety recalls issued by the National Highway Traffic Safety Administration (NHTSA) for the Engine Control Module on the 2006 Infiniti G35. Recalls for this model year primarily concern the airbags and headlights.

Cost Comparison

The cost of replacing an ECM can vary widely based on the source of the part and labor rates.

Shop Labor: Expect to pay between $150 and $300 for installation and programming. The physical replacement is quick (less than an hour), but the programming procedure adds time and requires specialized equipment.

Frequently Asked Questions (FAQ)