2007 Infiniti G35 Sedan ECM: Failure Symptoms, Programming, and Replacement
This guide covers the common failures, critical programming requirements, and replacement costs for the Engine Control Module (ECM) in the 2007 Infiniti G35 Sedan.
- A replacement ECM for a 2007 G35 Sedan MUST be programmed to the car's anti-theft system (NATS) to start the engine.
- The 2007 G35 Sedan (V36) and Coupe (V35) use different engines and non-interchangeable ECMs.
- Common failure symptoms include a no-start condition, stalling, communication errors (U1000), and multiple warning lights.
- Buying a used ECM requires matching part numbers exactly and budgeting for programming costs unless purchasing a pre-programmed unit.
Important: 2007 G35 Sedan (V36) vs. Coupe (V35)
Compatibility Warning: The 2007 model year was a transition period for the Infiniti G35. The 4-door Sedan is the newer V36 chassis with the VQ35HR engine. The 2-door Coupe is the older V35 chassis with the VQ35DE engine. These two models use completely different Engine Control Modules. This guide and the part numbers listed, such as 23710JK68A, are specifically for the 2007 Infiniti G35 Sedan. Ensure you are purchasing the correct ECM for your specific body style.
Symptoms of a Failing ECM
ECM failure can manifest in various ways, from subtle glitches to a car that won't start at all. Because the ECM controls so many functions, symptoms can sometimes be mistaken for other problems. One of the most telling signs of a true ECM failure is the sudden appearance of multiple, seemingly unrelated error codes.
🎬 Watch: How a new ECU fixed this sedan's misfire issues- Check Engine Light: This is often the first indicator, though it can be caused by many different issues.
- Engine Stalling or Shutting Off: The engine may stall unexpectedly while idling or even while driving. This can be a serious safety issue.
- No-Start or Cranks-But-No-Start: You may turn the key and the engine cranks, but it will not fire up. This can happen if the ECM is not sending signals to the fuel injectors or ignition coils, or if it has lost communication with the immobilizer system. 🎬 See how to troubleshoot a G35 that won't start
- Rough Idle and Misfires: An erratic idle, stuttering, or engine misfires can be caused by the ECM failing to properly regulate the air-fuel mixture or spark timing.
- Poor Performance and Fuel Economy: A noticeable drop in acceleration or a sudden decrease in gas mileage can point to an inefficiently operating engine managed by a faulty ECM.
- No Communication with Scan Tool: If a diagnostic scan tool cannot connect to the ECM, it's a strong sign that the module itself has failed. This is often accompanied by the OBD-II code U1000 (CAN Communication Circuit).
Common OBD-II Trouble Codes
- P0600 - P0606: These codes relate directly to internal ECM/PCM processor faults.
- U1000: Indicates a loss of communication with the ECM on the vehicle's network.
- P1610 - P1615: These are immobilizer-related codes (NATS - Nissan Anti-Theft System). You will almost certainly see these if you install a used ECM without programming it to the vehicle.
ECM Programming and Immobilizer Link
Critical: A replacement ECM, whether new or used, MUST be programmed to your vehicle. The ECM is linked to the Nissan Anti-Theft System (NATS). If the replacement ECM is not synchronized with your car's Body Control Module (BCM) and keys, the immobilizer will activate, and the engine will not start.
You have several options for programming:
- Infiniti Dealership: A dealer can program the ECM using their proprietary CONSULT diagnostic tool. This is the most straightforward but often most expensive option.
- Independent Repair Shop: Many independent shops that specialize in imports have advanced scan tools (like Autel) or software (like Nissan Data Scan) that can perform the necessary key and module relearn procedures.
- Mail-In Programming Service: You can purchase a used ECM from a company that will pre-program it to your vehicle's VIN before shipping it to you. This makes the module 'plug-and-play,' requiring no further programming after installation. Some services can also repair your original module or disable the NATS system entirely.
- Advanced DIY: It is technically possible for a skilled DIYer to purchase a J2534 pass-thru device and a subscription to Nissan's ECU Reprogramming Software (NERS) to perform the update. However, this is a complex and costly process not recommended for beginners.
Known Issues, TSBs, and Recalls
While there are no direct recalls for the ECM on the 2007 G35, there are several related items of note.
- Recalls: Several recalls were issued for the 2007 G35, but they pertain to the passenger airbag occupant classification sensor (OCS) and wiring, not the ECM.
- Technical Service Bulletin (TSB) for Throttle Sensitivity: Owners of early 2007 G35 Sedans noted overly sensitive throttle response. Infiniti released a TSB with a software update for the ECM to correct this. If you are replacing your ECM, a pre-programmed unit or a dealer-programmed unit should have this latest software installed. A unit from a donor car may have the original, more sensitive software.
Buying a Used Engine Control Module
Purchasing a used OEM ECM is a cost-effective alternative to a new unit, but careful verification is essential.
- Match Part Numbers Exactly: The part number on the replacement ECM must be an exact match or a verified superseded number for your original module. The primary Infiniti part number often starts with '23710' (e.g., 23710-JK68A), and the sticker may also have a 'MEC' number (e.g., MEC100-090 E1). Do not attempt to use an ECM from a coupe or a different model year.
- Physical Inspection: When you receive the used module, inspect the case for any signs of being pried open. Check all connector pins to ensure none are bent, broken, or corroded.
- Source Matters: Buy from reputable sellers who offer a warranty. Water damage is a common cause of failure, so avoid parts that show any signs of corrosion or water intrusion.
- Factor in Programming: Remember that the cost of the part is not the final cost. You must budget for programming by a dealer or qualified shop unless you are buying a pre-programmed unit.
Replacement Cost Breakdown
Prices can vary based on your location and the chosen parts source.
| Part/Service | Estimated Cost |
|---|---|
| New OEM (from dealer) | $850 - $1,800+ |
| Used OEM | $100 - $350 |
| Remanufactured / Pre-Programmed | $350 - $500 |
| Shop Labor (Installation & Programming) | $150 - $300 |
Pro Tip: The ECM is located behind the glove box on the passenger side. Replacement requires removing the glove box assembly to gain access to the two 10mm bolts holding the ECM bracket. While not overly difficult, it can be tedious for a first-timer. Always disconnect the battery before unplugging the old ECM.
🎬 Watch: Step-by-step guide to removing your Infiniti ECUFrequently Asked Questions (FAQ)
Do I absolutely have to program a replacement ECM?
Yes. The ECM is tied to the vehicle's anti-theft immobilizer system (NATS). An unprogrammed ECM will prevent the car from starting. The only exception is if you buy a 'plug-and-play' module that has been pre-programmed to your car's VIN by a mail-in service.
Can I use an ECM from a G35 Coupe in my Sedan?
No. The 2007 G35 Coupe and Sedan are different vehicle generations with different engines (VQ35DE vs. VQ35HR). They use completely different ECMs that are not interchangeable. You must use an ECM specifically for a 2007 G35 Sedan.
Can I replace the ECM myself to save money?
You can physically install the module yourself to save on labor costs. The ECM is located behind the passenger side glove box. However, after installation, the vehicle will be undrivable until the ECM is programmed by a dealer or a mobile technician with the correct tools.
What causes the ECM to fail?
The most common causes of failure are external factors. Water damage from clogged cowl drains or a leaky windshield is a primary culprit. Other causes include electrical shorts in vehicle wiring, voltage spikes from improper jump-starting, and prolonged exposure to excessive heat and vibration.
Helpful Videos
Technical Specifications
OEM Part Numbers: 23710JK68A 23710JK68B 23710JK68C 23710JK68D 23710JK68E 23710-JK60A 23710-JK62B 23710-JK63B 23710-JK69A MEC100-090 E1 MEC100090E1 MEC100-010 E1 MEC100-100 E1
Vehicle Fitment: 2007 Infiniti G35 Sedan (V36 Chassis). Location: Behind passenger side glove box.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Infiniti G35:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Important: 2007 G35 Sedan (V36) vs. Coupe (V35)
- Symptoms of a Failing ECM
- Common OBD-II Trouble Codes
- ECM Programming and Immobilizer Link
- Known Issues, TSBs, and Recalls
- Buying a Used Engine Control Module
- Replacement Cost Breakdown
- Frequently Asked Questions (FAQ)
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