Restore Your Jeep’s Legendary Performance
Is your trusty 1999 Jeep Grand Cherokee acting up? A faulty Engine Control Module (ECM) can be the hidden cause behind a host of frustrating issues, turning your reliable SUV into a source of stress. From a stubborn no-start condition to a persistent check engine light, a failing computer can sideline your vehicle. This professionally programmed engine computer is the definitive, hassle-free solution to get your 4.0L Jeep back on the road and running strong, just like it was designed to.
Common Symptoms of a Failing 4.0L ECM & Your Solution
If you’re experiencing any of the following problems, a failing engine computer is the likely culprit. This unit is designed to be the direct fix for these issues:
- No-Start or Hard Starting: The engine cranks but refuses to fire up, or takes an excessive amount of time to start.
- Engine Stalling: Your Jeep stalls unexpectedly while driving or when coming to a stop.
- Check Engine Light (CEL): You may see diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or other communication-related faults.
- Poor Performance & Fuel Economy: A noticeable drop in power, hesitation during acceleration, and a sudden decrease in miles per gallon.
- Erratic Shifting or Gauge Behavior: The ECM plays a role in transmission communication; failure can lead to harsh shifts or incorrect gauge readings.
Instead of spending a fortune at the dealership, this is your plug-and-play fix. We handle all the programming, so you can handle the simple installation. This is the most efficient way to replace a faulty 1999 Jeep Grand Cherokee ECM and restore your vehicle’s health.
Features & Benefits
- ✔ Completely Plug & Play: This unit arrives at your door fully programmed to your vehicle’s specific VIN and mileage. No extra trips to the dealer for expensive flashing are required.
- ✔ Guaranteed Compatibility: A direct replacement for part numbers 05018189AA, 56041423AA, 56041423AB, 56041423AC, 56041423AD, 56041423AE, 56041423AF, 56041423AG, and 56041423AH.
- ✔ Restores Original Function: Engineered to restore factory performance, fuel efficiency, and emissions control for your 4.0L engine with Federal emissions.
- ✔ Cost-Effective Solution: Get your Jeep fixed for a fraction of the cost of a new module and programming services from a dealership or local shop.
- ✔ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty, so you can install it with confidence.
Expert Insight: The Heart of the 4.0L Legend
As a technician, I’ve seen countless 1999-era Grand Cherokees with the bulletproof 4.0L engine. These things are built to last, but their electronics aren’t invincible. I once had a customer who was convinced his transmission was failing due to harsh, erratic shifting. After checking the transmission and finding nothing wrong, we traced the issue back to the ECM. It was sending faulty signals, confusing the entire system. A new, properly programmed 1999 Jeep Grand Cherokee ECM didn’t just fix the shifting; it smoothed out the idle and brought the whole vehicle back to life. Never underestimate how critical this single component is to your Jeep’s overall health and longevity.
Frequently Asked Questions
Is this ECM truly plug and play?
Yes. We program the module using the VIN and mileage you provide during checkout. When you receive it, you simply disconnect the battery, swap the old module with this one, and reconnect the battery. No further programming is needed.
What information do you need from me?
We require your vehicle’s 17-digit Vehicle Identification Number (VIN) and the current mileage. This ensures the computer is a perfect match for your Jeep’s specific configuration and security systems.
Will this fix my specific check engine light codes?
This module is the definitive solution for internal ECM failure codes, such as P0601, P0605, and other communication errors. If your codes point to a specific sensor (like an O2 sensor), you should inspect that sensor first. However, a failing ECM can sometimes cause false sensor codes.
How do I find my original part number?
Your Jeep’s original part number is printed on a sticker on the ECM itself. The module is located in the RH rear of the engine compartment. Matching your number to the list in our description confirms compatibility.
Does this fit all 1999 Grand Cherokees?
This specific 1999 Jeep Grand Cherokee ECM is for models equipped with the 6-cylinder (4.0L) engine and Federal emissions. Please verify these options for your vehicle to ensure a perfect fit.