Is Your Grand Cherokee Running Rough? Get a Reliable Solution.
If you’re dealing with frustrating issues like stalling, poor acceleration, a persistent check engine light, or even a no-start condition in your 2005-2006 Jeep Grand Cherokee, a failing Engine Control Module (ECM) is a very likely culprit. As the central computer for your vehicle, the ECM manages everything from fuel injection and ignition timing to transmission shifting. When it starts to fail, the symptoms can be unpredictable and concerning. Over my 20+ years in the shop, I’ve seen firsthand how a faulty ECM can sideline an otherwise perfectly good vehicle.
This isn’t just a replacement part; it’s a direct, hassle-free fix. We take the complexity out of the repair by programming this module specifically for your vehicle. Simply provide your VIN and mileage during checkout, and we’ll flash the unit so it arrives at your door ready for a true plug-and-play installation. You can get your Jeep back to factory-spec performance without the expensive trip to the dealership for programming.
Symptoms of a Failing 2005-2006 Grand Cherokee ECM
A bad engine computer can manifest in numerous ways. If you’re experiencing any of the following, it’s time to consider a replacement:
- โ Check Engine Light is on with various, often unrelated, trouble codes.
- โ The engine cranks but refuses to start.
- โ Stalling, hesitation, or rough idling, especially when warm.
- โ A noticeable drop in fuel economy.
- โ Transmission shifting problems or getting stuck in gear.
- โ Communication errors with diagnostic scan tools.
Expert Pro Tip: Check for External Faults First
Before installing your new ECM, take five minutes to inspect the main engine wiring harness, particularly where it runs near the exhaust manifolds and behind the cylinder heads. Over time, the protective loom can become brittle and crack, exposing wires. A short in a sensor’s 5-volt reference circuit (like an O2 sensor or MAP sensor) can damage the driver circuits in the ECM. I’ve seen customers damage a brand new module because they didn’t fix the original short that caused the first one to fail. A quick visual inspection can prevent a costly mistake.
Plug-and-Play Installation: No Dealer Visit Required
You can perform this installation yourself with basic hand tools, saving hundreds in labor costs. The ECM is located in the engine compartment on the right-hand (passenger) side, near the firewall.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes for the system capacitors to discharge.
- Locate the ECM: Find the module on the passenger side of the engine bay. It will have several large electrical connectors attached.
- Disconnect Connectors: Carefully release the locking tabs on each of the wiring harness connectors and pull them straight off the module. Never force them.
- Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to its bracket.
- Install the New Module: Mount your new, pre-programmed ECM in place and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new module until they click and lock into place. Reconnect the negative battery terminal.
- Final Step: Start your Grand Cherokee and let it idle for a few minutes to allow the systems to sync. Your repair is complete!
Guaranteed Fitment and Compatibility
This engine computer is a direct-fit replacement for 2005-2006 Jeep Grand Cherokee models equipped with the 3.7L engine and 4×4 drivetrain. It is fully compatible with the following OEM part numbers, ensuring a perfect match for your vehicle’s original equipment:
Compatible Part Numbers: 05094895AB, 05094898AA, 05094898AB, 05094898AC, 05094898AD, 05094898AE, 05094898ZB, 56044742AC, 56044742AD, 05094898AF