2009 Infiniti EX35 PCM and ECM Replacement Guide
In the 2009 Infiniti EX35 the Powertrain Control Module and Engine Control Module manage engine timing, fuel delivery, and emission controls. A failure typically interrupts sensor data, causing loss of power, stalling, or a dead scan‑tool connection. The fault often triggers the internal code P0605, indicating a communication problem within the module.
Quick Summary
- PCM removal and reinstall requires about 2.1 labor hours.
- ECM removal and reinstall takes roughly 0.8 labor hours.
- After ECM replacement, a 0.5‑hour relearn procedure is needed.
- The P0605 code signals internal communication loss.
When a 2009 Infiniti EX35 begins to exhibit erratic power‑train behavior, the underlying cause often points to the vehicle’s control computers. Understanding how the Powertrain Control Module (PCM) and Engine Control Module (ECM) function, what symptoms signal a problem, and what the repair process entails can save you time and money. This guide walks you through the basics of these modules, the typical labor involved, and what to expect after a replacement, so you can make an informed decision about keeping your EX35 running smoothly.
What the PCM Does in a 2009 Infiniti EX35
The PCM in a 2009 Infiniti EX35 acts as the central command unit for the power‑train, interpreting sensor inputs to control fuel injection, ignition timing, and transmission shift points. It communicates continuously with the ECM, which focuses on engine‑specific tasks such as managing emissions, idle speed, and diagnostic monitoring. Together they ensure the engine runs efficiently and meets emissions standards. A malfunction in either module can disrupt this coordination, leading to performance loss or a complete shutdown. Replacement modules for this vehicle are often sourced as 2009 Infiniti EX35 engine control modules, which match the original specifications and software.
Flagship One keeps Infiniti EX35 replacement engine computers in stock for exactly this failure pattern.
Where the PCM Is Located and What Replacement Involves
Both the PCM and ECM reside within the engine compartment of the 2009 Infiniti EX35, typically mounted near the firewall for easy access. Removing the PCM generally requires about 2.1 hours of labor, according to the factory book time, and involves disconnecting the main power harness, unplugging sensor connectors, and unbolting the unit. The ECM is located close to the intake manifold and takes roughly 0.8 hours to replace, following a similar sequence of disconnects and bolt removal. After installing a new unit, the technician must re‑connect all wiring and secure the module with the original fasteners. No additional torque specifications are provided in the source data.
| Operation | Configuration | Book Time |
|---|---|---|
| Powertrain Control Module R&R | All configurations | 2.1 hr |
| Engine Control Module Relearn | All configurations | 0.5 hr |
| Engine Control Module R&R | All configurations | 0.8 hr |
Programming Requirements After Replacement
Once the PCM or ECM is swapped, the factory service procedure calls for an Engine Control Module Relearn that consumes about 0.5 hours. This step calibrates the new computer to the vehicle’s existing sensors and ensures proper communication across the network. Flagship One supplies a VIN‑programmed replacement unit, which arrives pre‑loaded with the correct calibration data, effectively eliminating the need for the relearn step in most cases.
Every VIN-programmed replacement unit from Flagship One arrives with these steps already completed.
Symptoms of a Failing PCM
A failing PCM or ECM in a 2009 Infiniti EX35 may manifest as a no‑start condition, rough idle, unexpected stalling, or erratic transmission shifts. Drivers often notice a loss of power during acceleration or the illumination of the check‑engine light accompanied by stored fault codes. In many cases the scan‑tool will lose communication with the vehicle, making diagnostics difficult. The internal fault code P0605 communication fault is a common indicator that the module’s internal data bus has been compromised, leading to these observable issues.
Module Trouble Codes on the 2009 Infiniti EX35
The following internal trouble codes are documented for the 2009 Infiniti EX35 related to its control modules:
| Code | Meaning | Full Guide |
|---|---|---|
| P0605 | Internal ROM error | Full P0605 guide → |
Protecting the PCM in Your 2009 Infiniti EX35
- Maintain a healthy charging system to avoid voltage spikes.
- Inspect and clean all ground points and connector contacts regularly.
- Use proper jump‑start techniques to protect electronic modules.
- Address any stored diagnostic codes promptly to prevent escalation.
- Keep connector seals intact to guard against moisture intrusion.
- Avoid prolonged exposure to extreme temperatures that can stress electronics.
Frequently Asked Questions
What are the typical labor times for replacing the PCM in a 2009 Infiniti EX35?
Factory guidelines estimate about 2.1 hours of labor for removing and reinstalling the PCM on this model.
Does the 2009 Infiniti EX35 require a relearn after installing a new ECM?
Yes, the standard procedure includes a 0.5‑hour Engine Control Module Relearn to synchronize the new unit with existing sensors.
What does the P0605 code indicate for a 2009 Infiniti EX35?
P0605 signals an internal communication fault within the control module, often resulting in loss of scan‑tool connectivity and engine performance issues.
Can I use a refurbished PCM instead of a new one on my EX35?
Refurbished units that meet factory specifications can be used, but they must be programmed to match the vehicle’s VIN to ensure proper operation.
How often should I check the ground connections for the EX35’s control modules?
Regular visual inspections during routine service are advisable, especially if you notice intermittent electrical symptoms.
When the PCM or ECM in your 2009 Infiniti EX35 needs attention, you can choose a brand‑new factory‑spec unit or a professionally refurbished replacement. Both options restore the vehicle’s original functionality, but a refurbished part may offer cost savings while still meeting the required performance standards.
Flagship One stocks a refurbished, VIN-programmed PCM for the 2009 Infiniti EX35 with a lifetime warranty, free shipping and no core charge. The full Infiniti EX35 module lineup covers other engine configurations as well.
Final Thoughts
Addressing PCM or ECM issues in your 2009 Infiniti EX35 promptly helps maintain reliable performance and prevents further drivetrain complications. Consider your repair or replacement options and choose the solution that fits your needs.