2008 Infiniti G35 Sedan ECM: A Guide to Part Numbers, Programming, and Replacement
Replacing the engine computer in your 2008 G35 sedan requires exact part matching and mandatory programming to avoid a no-start condition.
- This ECM only fits the 2008 G35 4-door Sedan with AWD, automatic transmission, and no adaptive cruise control.
- Programming is mandatory. The vehicle will not start with a replacement ECM until it is programmed to the car's VIN and keys.
- You must match the Hitachi or Infiniti part number on your old ECM exactly with the replacement unit.
- Before replacing the ECM, rule out simpler issues like a bad battery, alternator, or poor ground connections, which can cause similar symptoms.
Symptoms of a Failing 2008 G35 ECM
Diagnosing a faulty Engine Control Module can be challenging because its symptoms often mimic other, less complex problems. 🎬 Watch: Learn the top symptoms of a failing ECM A key indicator of ECM failure is the sudden appearance of multiple, unrelated issues and error codes. Before condemning the ECM, it's wise to first check the battery, alternator, and all main power and ground connections, as electrical issues can cause similar symptoms.
- Check Engine Light: This is often the first sign of a problem. Specific codes like P0603 (Keep Alive Memory Error) or P0605 (Internal Control Module ROM Error) point directly to an internal ECM fault.
- Engine Stalling or Misfiring: The engine may stall unexpectedly, idle roughly, or misfire. This happens when the ECM can no longer accurately manage the air-fuel mixture or spark timing.
- Crank, No-Start Condition: The engine will turn over but won't start. This can occur if the ECM isn't signaling the fuel injectors and ignition coils, or if it has lost its connection with the vehicle's anti-theft system. 🎬 See how to diagnose a G35 crank-no-start condition
- Poor Performance and Fuel Economy: A noticeable drop in power, acceleration, or fuel efficiency can indicate the ECM is not managing the engine effectively.
- No Communication with Scan Tool: If a diagnostic scan tool cannot connect to the ECM, it's a strong sign the module has failed. This is often associated with a U1000 CAN communication error code.
- Erratic Transmission Shifting: The ECM sends data to the transmission controller. A faulty ECM can cause hard, delayed, or erratic shifts.
Pro Tip: Water intrusion is a known issue that can damage electronics in the G35. Clogged sunroof drains can allow water to leak into the passenger footwell, where the Body Control Module (BCM) is located. While the ECM is located behind the glovebox, it's worth checking for any signs of moisture in this area if you suspect an electrical problem.
Buying a Used 2008 Infiniti G35 ECM: Critical Information
Purchasing a used ECM is a cost-effective solution, but it requires careful attention to detail to ensure compatibility. Failure to follow these steps will result in a part that will not work in your vehicle.
1. Verify Compatibility: Sedan, AWD, and Automatic ONLY
The part numbers listed in this guide are specifically for the 2008 Infiniti G35 4-door Sedan with All-Wheel Drive (AWD) and an automatic transmission. These modules are also not compatible with vehicles that have adaptive cruise control. An ECM from a coupe, a RWD model, or a manual transmission vehicle will not work.
2. Match the Part Number EXACTLY
You must match the OEM part number on your original ECM to the number on the replacement unit. The part number is printed on a sticker on the module's case. Even a single digit difference can mean the module has different hardware or software.
Verified OEM Part Numbers for this vehicle:
- Hitachi P/N: MEC100-600 D1, MEC100-601 A1
- Infiniti P/N: 23710-1NA8A, 23710-1NA8B, 23710-1NA8C, 23710-1NA8D
Warning: Do not install an ECM with a different part number. It may cause a no-start condition, unpredictable engine behavior, or damage to other electronic components.
3. Programming and Key Relearn are MANDATORY
A used ECM cannot be simply swapped into your vehicle. The car will not start until the module is programmed with your car's Vehicle Identification Number (VIN) and synchronized with the immobilizer system.
- Immobilizer Link: The ECM is a key component of the Nissan Anti-Theft System (NATS). When you install a replacement ECM, it will not recognize your existing keys, preventing the engine from starting.
- Who Can Program It? An Infiniti dealership is the most reliable option. Some specialized independent auto repair shops or automotive locksmiths with high-level tools like the Autel MaxiSys or the factory CONSULT diagnostic tool can also perform this service. A standard OBD-II code reader cannot program the ECM or keys. 🎬 Watch: How to program keys using an Autel tool
Known Issues, Recalls, and Technical Service Bulletins (TSBs)
While there are no recalls specifically for ECM failure on the 2008 G35, there are some related items:
- NHTSA Campaign 08V521000: This major recall was for the Occupant Classification System (OCS) control unit, which could prevent the passenger airbag from deploying. This is unrelated to the ECM but is an important safety check for any 2008 G35 owner.
- ECM Reprogramming TSBs: For the earlier 2007 model year, Infiniti issued TSBs like ITB07-045a to update the ECM software and correct an overly sensitive throttle response. A 2008 model or a properly updated replacement ECM should already have this improved software.
Cost to Replace a 2008 G35 ECM
The total cost involves the price of the part and the labor for installation and programming. Labor for the physical swap is minimal (under 1 hour), but programming can add 1-2 hours of shop time.
| Part Type | Estimated Cost |
|---|---|
| New OEM | $1,200 - $1,500 |
| Remanufactured | $200 - $500 |
| Used OEM | $75 - $250 |
| Shop Labor (Swap & Program) | $250 - $500 |
Frequently Asked Questions (FAQ)
Where is the ECM located on a 2008 Infiniti G35 Sedan?
The ECM is located behind the glove box on the passenger side of the vehicle. Access requires removing the glove box assembly.
Will my car start after I install a used ECM?
No. The engine will crank but will not start because the replacement ECM is not programmed to your vehicle's anti-theft system (NATS) and keys. It must be programmed by a dealer or a qualified shop.
Can I program the ECM myself?
No, not without professional-grade diagnostic tools. Standard OBD-II scanners cannot perform the necessary VIN writing and key relearn procedures. This job requires specialized equipment like the Infiniti CONSULT tool or an advanced aftermarket system.
What are the common anti-theft system error codes?
If you install an unprogrammed ECM, you will likely see Diagnostic Trouble Codes (DTCs) related to the NATS immobilizer, such as P1610, P1611, P1612, P1614, and P1615. These codes indicate a communication failure or mismatch between the key, immobilizer, and ECM.
Helpful Videos
Technical Specifications
OEM Part Numbers: MEC100-600 D1 MEC100-601 A1 23710-1NA8A 23710-1NA8B 23710-1NA8C 23710-1NA8D 237101NA8A 237101NA8B 237101NA8C 237101NA8D
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
- Symptoms of a Failing 2008 G35 ECM
- Buying a Used 2008 Infiniti G35 ECM: Critical Information
- 1. Verify Compatibility: Sedan, AWD, and Automatic ONLY
- 2. Match the Part Number EXACTLY
- 3. Programming and Key Relearn are MANDATORY
- Known Issues, Recalls, and Technical Service Bulletins (TSBs)
- Cost to Replace a 2008 G35 ECM
- Frequently Asked Questions (FAQ)
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