ECM(Engine control module), also known as an ECU(Engine control unit) ensures the engine functions perform at an optimal level. It is loaded with software that collects data from the sensor and optimizes the engine performance.
The ECM of the Jeep Wrangler receives power from the battery and it can malfunction when the battery voltage spikes and the connection of the wires is loosened. Besides, it can short-circuit when it is exposed to water or moisture and corrode the wires harness.
Furthermore, the ECM of the Jeep Wrangler will not operate when the software installed in it crashes due to an overload of voltage from a short circuit or components. Also, installing a new starter without a voltage regulator can bypass the surge protection of the ECM and lead to a power surge while igniting the engine.
What Are the Common Signs of Jeep Wrangler ECM Problems?
The common signs that show Jeep Wrangler having trouble with ECM are given below.
Engine Check Light: Jeep Wrangler’s engine check light will blink on the odometer of the dashboard. Even though it can appear due to other reasons but it can also happen for ECM.
Issue with Transmission: The automatic transmission of the Jeep Wrangler will not shift the gear from first to second and shifting would be hard in manual transmission.
Abnormal Engine Behavior: The engine of the Jeep Wrangler may misfire, or stall when accelerating and performance will drop significantly.
Trouble with starting: The Jeep Wrangler will not start or have trouble starting after cranking several times. Acceleration power will be reduced and the engine will consume more fuel than usual.
Misbehave of Electrical Components: Components such as sensors, gauges, or other electrical components that run on electricity will have a lack of power and they will behave inappropriately.
What Causes Jeep Wrangler ECM Problems? Solutions
There are several causes that can affect the Jeep Wrangler ECM unit which can be due to low voltage in a battery, a new starter bypassed the surge protection, water or moisture corroded the wire harness, software in the ECM crashed or outdated, and the vehicle is overheated.
1. Battery Issues
Low voltage in a battery of Jeep Wrangler can often disturb the adequate functioning of ECM. The ECM can fail when the voltage spikes severely or there is a loose connection between wires. Besides, the battery can be faulty due to age or the factory default battery is installed in the vehicle.
Solution to Battery Issues
Check the negative and positive terminals of the Jeep Wrangler battery and ensure the voltage is adequate by checking it with a multimeter. It is suitable to replace the battery if it is too old or there is no sign of voltage in the multimeter.
2. Starter Issues
Installing a new starter without a voltage stabilizer can drastically impact the Jeep Wrangler ECM. A new starter often dodges the surge protection of the ECM which leads to an electrical surge during the cranking of the vehicle. The ECM can also fail when wires are connected to crossed terminals during jump starting.
Solution to Starter Issues
Install a voltage stabilizer or surge protector during the installation of the starter or other major electrical components that can probably damage the ECM of the Jeep Wrangler. Make sure the wires are connected to the same terminals like positive-to-positive and negative-to-negative of both vehicles during jump starting.
3. Corrosion or Water Damage Issues
Exposure to water or moisture can corrode the wires harness over time, which are connected directly to the ECM and other components of the Jeep Wrangler results, in the ECM short-circuit or not getting sufficient voltage. Moreover, the water can damage the ECM housing seals leading to corrosion or electrical issues.
Solution to Corrosion or Water Damage Issues
You have to replace the entire wiring of the Jeep Wrangler that is connected to the ECM and other electrical components because changing a single corroded wiring will not provide sufficient power to the ECM to run the unit. In case of damaged ECM seals, you have to replace the ECM unit completely. You can follow the steps below for DIY to replace the ECM unit.
- The ECM unit is placed behind the battery so you have to remove the battery first to remove it from the vehicle.
- After the battery is removed then unplug the sockets or wires that are connected to it and unmount the bolts that are attached to it. Then, simply remove the old ECM unit from the vehicle.
- Apply dielectric grease on the head of the sockets or wires so that it can prevent moisture or water and doesn’t become corroded.
- Place the new ECM by mounting the bolts and attaching the sockets or wires to it. Connect the battery to provide power to the vehicle and test drive to see the result.
Be noted, that the software is already installed in it. You can also take the vehicle to any certified workshop and they can do the work for you if it is confusing. The price of a Jeep Wrangler ECM unit comes within a range of $400-$700, make sure to check if it’s compatible with your vehicle or not.
4. Software Issues
Jeep Wrangler ECM unit comes with software like all other vehicles. ECM functions according to the coding of the software. The software though rare, crashes due to an overload from a shorted circuit or component. It can also fluctuate when the software gets outdated or glitches.
Solution to Software Issues
In this case, visit to Jeep dealership or any authorized service center to reinstall the software according to the engine compatibility. They will properly diagnose the issue with the necessary tools and expertise.
5. Overheating Issues
The ECM of the Jeep Wrangler is located under the bonnet inside the engine compartment so it can malfunction, especially in summer when the vehicle gets overheated. Overheating usually occurs when any components of the cooling system such as a radiator, hoses, water pump, etc. become faulty or not functioning accurately.
Solution to Overheating Issues
Visually inspect and take necessary measures to keep the cooling system of the engine compartment working functionally. Keep a good amount of airflow in the engine compartment and replace components immediately if damaged. In severe cases, relocate the ECM to any cooler area of the vehicle.
Can You Fix Jeep Wrangler Ecm Problems Yourself?
Yes, technically you can fix your Jeep Wrangler ECM problems by yourself. Replacing the ECM unit is not that complex and someone with sound knowledge and advanced tools can easily diagnose the problem.
However, the problem is with the ECM itself. Many Jeep Wrangler ECMs do not come with software preloaded so in this case, you have to take your vehicle to an authorized dealer shop to install the software which requires advanced tools and techniques that result in an additional cost of fixing.
Can You Drive With a Faulty ECM?
It is not recommended to drive the Jeep Wrangler with a faulty ECM. It plays an important role in performing various engine functions such as transmission, fuel injection, emission, safety, etc. Driving with a faulty ECM will reduce the overall performance of the engine and fuel efficiency. Also, there is a risk of damaging these components which can lead to an additional cost.
It is advisable to address ECM issues immediately at any certified workshop and have them replaced or repaired by a professional mechanic.
Can ECM Problems Lead to Engine Damage?
ECM problems may not directly lead to engine damage but however, it can damage the engine components if not fixed promptly. The engine will not run as smoothly as before or it may not start at all. The performance of the engine will drop significantly and the components will start running abnormally.
ECM is like the brain of the engine which is responsible for controlling the various engine functions just like the human brain that controls the human body. It receives data from the sensor of the Jeep Wrangler and optimizes engine performance, fuel efficiency, and emissions.