2009 Ram, Grand Cherokee, Durango & More 5.7L ECM: The Truth About Programming and Replacement

Symptoms of a Failing 5.7L Hemi ECM

A failing ECM can cause a wide range of problems, many of which can be mistaken for other component failures. It's important to diagnose the issue carefully before condemning the computer. Common symptoms include:

• Engine Will Not Start: The engine may crank but fail to start because the ECM is not sending the proper signals for spark or fuel injection.
• Stalling or Misfiring: The engine may stall unexpectedly while driving or run rough with frequent misfires.
• Check Engine Light: A constant or flashing Check Engine Light is a primary indicator. The ECM may set codes related to its own internal failure or lose communication with other modules.
• Poor Engine Performance: You might notice a sudden drop in power, poor acceleration, or a significant decrease in fuel economy.
• Erratic Shifting: In these vehicles, the ECM also plays a role in transmission control, so a faulty module can lead to harsh or incorrect shifting.

Common Diagnostic Trouble Codes (DTCs)

While many codes can point to a bad ECM, some are more common than others. A major failure point in these modules is the ignition coil driver circuit. If one of your ignition coils fails, it can short out and damage the corresponding driver inside the ECM. This often results in specific misfire codes that won't go away even after replacing the coil.

• P0351 - P0358: Ignition Coil Primary/Secondary Circuit Malfunction (for cylinders 1-8). These codes are a strong indicator of a failed coil driver in the ECM.
• P2302 - P2323: Ignition Coil Driver Circuit Faults. Similar to the codes above, these point directly to an issue with the ECM's ability to fire the coils.
• P0622: Alternator Field Control Circuit Malfunction. This can indicate the ECM is not properly controlling the alternator, leading to charging issues.
• U-Series Codes (e.g., U0100): Lost Communication With ECM/PCM. This means other modules on the vehicle can no longer talk to the engine computer.

Diagnosing a Faulty ECM: Rule Everything Else Out First

An ECM should be the last part you replace. Before condemning the module, a thorough diagnosis is essential. Many other, more common issues can mimic ECM failure.

1. Check Power and Grounds: Verify the battery is fully charged and the terminals are clean. Inspect and clean all major engine and chassis ground connections. A poor ground can cause a host of bizarre electronic issues.
2. Inspect the Wiring Harness: Look for any signs of damage, corrosion, or loose connections at the ECM connectors and sensor plugs.
3. Test Related Components: Use a scan tool to check for codes. If a code points to a specific sensor, test that sensor and its circuit before assuming the ECM is bad.
4. Don't Confuse the ECM with the TIPM: These vehicles are also equipped with a Totally Integrated Power Module (TIPM), which is the main fuse and relay box. A failing TIPM can cause issues like the fuel pump not running, headlights not working, or wipers acting erratically. These symptoms are often misdiagnosed as an ECM problem. The TIPM distributes power, while the ECM processes information.

Known Issues, Recalls, and Technical Service Bulletins (TSBs)

While there are no direct recalls for the ECM itself on these 2009 models, several related electronic issues are documented.

• NHTSA Recall 13V175000: This major recall affects 2009 Jeep Grand Cherokee and Commander models with 4-wheel drive. An electrical failure in the transfer case controller can cause the vehicle to shift into Neutral on its own, creating a rollaway risk. The fix is a software reflash performed by a dealer.
• NHTSA Recall 09V084000: Affects some 2009 Dodge Ram 1500 trucks. The HVAC module software could fail, disabling the windshield defroster. The fix is a dealer reprogram.
• Chrysler TSB 18-093-15: For the 2009 Dodge Ram 1500, this bulletin addresses a check engine light and other driveability concerns by reprogramming (flashing) the PCM with updated software.

Buying a Used Engine Control Module: What You Must Know

This is the most critical section for anyone buying a replacement ECM. Failure to follow these rules will result in a vehicle that does not run.

Compatibility is Key: Match the Hardware ID

The sticker on the ECM will have several part numbers. The most important one to match is the base hardware number. For this group of vehicles, that number is typically 05150390, often followed by two letters like AA, AB, AC, AD, or AE, which indicate software revisions. As long as the base hardware number matches, a module with a later software revision (e.g., AE instead of AB) will generally work once programmed.

VIN Programming is NOT Optional

Who Can Program the ECM?

You have a few options for programming, but you generally cannot do it yourself without expensive, specialized tools.

• Mail-In Programming Service: Many online retailers who sell used or remanufactured ECMs offer a pre-programming service. You provide them with your VIN when you order, and they flash the module before shipping it to you. This makes the installation 'plug-and-play'. This is often the easiest and most cost-effective option for a DIY repair.
• Dealership: A Chrysler, Dodge, Jeep, or Ram dealer can program a new or used ECM to your vehicle using their proprietary wiTECH diagnostic tool. However, some dealers may be unwilling to program a used part that you supply.
• Specialized Independent Shop: Some independent auto repair shops that specialize in diagnostics have the advanced scan tools (like a high-end Autel or Snap-on scanner with programming capabilities) and subscriptions needed to perform this function.
• Automotive Locksmith: A well-equipped automotive locksmith may also be able to perform the necessary programming to sync the ECM to the immobilizer system.

ECM Replacement Overview

The physical replacement of the ECM is straightforward.

• Location:
  • On the 2009 Jeep Grand Cherokee and Jeep Commander, the ECM is located in the engine bay, underneath the battery and battery tray. You must remove the battery to access it. This location makes it vulnerable to damage from a leaking battery.
  • On the 2009 Dodge Ram 1500, the ECM is typically mounted to the firewall in the engine compartment and is easily accessible.
  • The 2009 Dodge Durango and Chrysler Aspen share the Ram's platform and have the ECM in a similar, accessible location on the firewall.
• Procedure:
  1. Disconnect the negative battery terminal.
  2. Unplug the electrical connectors from the ECM. These usually have a locking tab that needs to be released.
  3. Remove the bolts (typically 8mm or 10mm) holding the ECM to its bracket.
  4. Install the new ECM, reconnect the connectors and mounting bolts, and reconnect the battery.
  5. If the module was not pre-programmed, the vehicle must now be taken to a dealer or shop for programming. If it was pre-programmed, the vehicle should start and run correctly.

Cost to Replace a 2009 5.7L Hemi ECM

Prices can vary significantly based on the source of the part and labor rates.

Frequently Asked Questions (FAQ)