Is Your 1999 Minivan Running Rough? It Could Be the ECM.
If you’re dealing with frustrating and unpredictable issues in your 1999 Chrysler Town & Country, Dodge Caravan, or Plymouth Voyager, the root cause might be something you haven’t considered: a failing Engine Control Module (ECM). This component is the central computer of your vehicle, responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When it starts to fail, it can create a cascade of problems that are often misdiagnosed, leading to expensive and unnecessary repairs. This direct-fit replacement module, part number 04727246AD, is the definitive solution to restore your vehicle’s performance and reliability.
From the Diagnostic Bay
We had a 1999 Dodge Caravan with the 3.3L Flex Fuel engine come into the shop with a classic intermittent problem. The owner said it would randomly stall at red lights, but then start right back up. Other times, it would hesitate badly when accelerating onto the highway. We checked the fuel pump, scanned for codes (which were intermittent communication faults), and inspected the wiring. Everything seemed fine. On a hunch, we connected a scope to the ECM’s power and ground circuits and took it for a long drive. After about 20 minutes, as the engine bay heated up, we saw the ECM’s internal voltage regulators start to fluctuate wildly right before it stalled. A faulty ECM was the culprit. Replacing it with a pre-programmed unit like this one solved the problem instantly, saving the customer from chasing phantom fuel or sensor issues.
Common Symptoms of a Failing Engine Computer
A faulty ECM can manifest in various ways. If your vehicle is experiencing any of the following, it’s a strong indicator that your engine computer may need replacement:
- ✔ Check Engine Light: The light is on, and you may have codes related to sensor circuits (P0100-P0600 series) or internal module failure.
- ✔ No-Start or Hard Starting: The engine cranks but refuses to start, or takes an unusually long time to fire up, especially when warm.
- ✔ Engine Stalling: The engine randomly shuts off while driving or idling at a stop.
- ✔ Poor Performance and Fuel Economy: You notice a significant drop in power, hesitation during acceleration, and your gas mileage has gotten worse.
- ✔ Rough or Erratic Idle: The engine idles unevenly, surging or dropping RPMs without reason.
- ✔ Automatic Transmission Problems: Harsh shifting, getting stuck in a gear (limp mode), or other erratic transmission behavior, as the ECM is critical for communicating with the transmission controller.
- ✔ Apparent Sensor Failures: Replacing sensors like the crankshaft or camshaft position sensor doesn’t fix the related error codes, pointing to the module as the issue.
The Plug-and-Play Solution: A Pre-Programmed 1999 Voyager Engine Computer
The biggest hurdle in replacing a modern vehicle’s computer is the complex programming required to sync it with your specific vehicle. This 1999 Voyager Engine Computer eliminates that entirely. We handle the programming for you before it ships. By providing us with your vehicle’s Vehicle Identification Number (VIN) and current mileage, we flash the module with your van’s exact factory software. This ensures that when you receive it, the unit is 100% plug-and-play. There is no need for an expensive trip to the dealership or a specialized mechanic with advanced scan tools. Installation is straightforward and can be done with basic hand tools.
Guaranteed Compatibility
This module is a direct replacement for a range of part numbers, ensuring a perfect match for your vehicle. It is compatible with the following OEM part numbers:
04727246AA, 04727246AB, 04727246AC, 04727246AD, 04727246AE, 05017591AA
This part is specifically for the following 1999 models equipped with the 6-cylinder 3.3L (VIN G) flex-fuel engine (FFV):
- 1999 Dodge Caravan
- 1999 Plymouth Voyager
- 1999 Chrysler Town & Country
Simple Installation Process
Replacing the ECM is a manageable task for a DIY mechanic. The module is located on the driver’s side (LH) fender in the engine bay.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the ECM: Open the hood and find the ECM on the driver’s side inner fender, near the battery.
- Disconnect Connectors: Carefully unplug the three large electrical harness connectors from the module. There are typically locking tabs that need to be released.
- Remove the Old Module: Unbolt the few screws or nuts holding the ECM bracket to the fender.
- Install the New Module: Mount your new, pre-programmed ECM in the same location.
- Reconnect Everything: Securely plug the three electrical connectors back into the new module. Reconnect the negative battery terminal.
- Start the Vehicle: Your van should now start and run correctly with its new brain. The plug-and-play programming means no further steps are required.
By choosing this pre-programmed 1999 Voyager Engine Computer, you are not just buying a part; you are buying a complete, hassle-free solution to get your trusted minivan back on the road safely and reliably.
Frequently Asked Questions
Is this engine computer truly plug-and-play?
Yes. We program the module with your vehicle’s specific VIN and mileage before shipping. This ensures it communicates correctly with all other systems in your van, requiring no additional programming upon installation.
Where is the ECM located on a 1999 Dodge Caravan or Plymouth Voyager?
The Engine Control Module is located in the engine compartment on the driver’s side (LH) inner fender, typically near the battery and power distribution center.
What information do you need from me to program it?
To ensure perfect programming, we require your vehicle’s 17-digit Vehicle Identification Number (VIN) and the current mileage. You can typically provide this during the checkout process.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal failure of the original ECM, then yes, this replacement part will resolve the issue and the associated codes. It will not fix problems caused by other faulty sensors or mechanical issues.
Is this compatible with the non-flex fuel 3.3L engine?
This specific part number is for the 3.3L Flex Fuel Vehicle (FFV) models. Please verify your vehicle is an FFV model or check your original part number to ensure compatibility.
Do I need to send my old ECM (core) back?
Please check the purchasing policy regarding core returns. Often, returning the old unit is part of the process and may entitle you to a partial refund, which helps keep costs down and promotes recycling of materials.