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Jeep Starts Then Dies Right Away: 8 Common Causes & Fixes

Jeep Starts Then Dies Right Away: 8 Common Causes & Fixes

If you’ve recently come to start your Jeep and found that it has died straight away, it will be a huge frustration and a significant concern.

There could be several reasons that your Jeep is dying right away, including fuel problems, battery connection, ignition, faulty sensors, and engine control, amongst other things.

Throughout this guide, you’ll find sections that cover each potential problem causing your Jeep to fail after starting up. Hopefully, we can find you a fix or a resolution for each one.

Let’s get started.

Common Causes for Jeep Dying Right After Starting

Common Causes for Jeep Dying Right After Starting

Below is a shorthand list of the common problems that often lead to a Jeep cutting out right after turning the key.

I’ll then look into each problem in more depth and advise you on how to deal with it.

  • Faulty Alarm System
  • Mass Air Flow Sensor Malfunction
  • Loose Battery Connection
  • Problem with Engine Control Unit
  • Fuel Injection Sensor
  • Fuel Pump Relay
  • Faulty Powertrain Control Module (PCM)
  • Ignition Problem

Let’s delve deeper.

1. Faulty Alarm System

If your Jeep is cutting out because of a faulty alarm system, it means that when you try to start the car, the system thinks it has been broken into and is being stolen.

It’s a pretty clever system, let’s face it. However, when it goes wrong, and you just want to get from A to B, the alarm failing can be a massive inconvenience.

The problem usually occurs when the chips inside the key fob are malfunctioning, not reacting, or sending the wrong information.

How To Fix?

Unfortunately, if your key fob and alarm system are faulty, this is a job for a mechanic.

2. Mass Air Flow Sensor Malfunction

The mass air flow, better known as the MAF, measures the air going into the engine.

These sensors are usually between the throttle body and the air filter housing.

When the MAFS is faulty, the engine will either not start, cut out at any time, or run unpredictably.

How To Fix?

To check if the problem is the MAFS, you must check the connections to ensure nothing is burned out or broken. Once you’ve analyzed the situation, it’s a quick fix. It’s inexpensive, too, and you can pick them up online, such as this airflow system for the Jeep Cherokee.

3. Loose Battery Connection

If there’s any loose wiring or unstable connections within the battery of your Jeep, chances are, this will be the reason your Jeep is starting and then immediately cutting out.

The best way to decipher this is to inspect the battery and check for any damage or corrosion. The best-case scenario is that it’s simply a case of a grease build-up.

How To Fix?

A good clean will get the job done if it’s simply down to grease build-up. However, any severe corrosion or dodgy-looking wiring will require an examination from a trained mechanic.

4. Problem with Engine Control Unit

The engine control unit, or the ECU, can sometimes malfunction, causing a lack of information sent from the sensors.

It means that information such as the fuel rate can be misread and can also mean severe engine problems are left undetected.

How To Fix?

You can only diagnose a faulty ECU with an OBD2 scanner. When scanned, it will show you a code to identify the exact problem.

5. Fuel Injection Sensor

The fuel injection sensor tells your Jeep’s computer system how much fuel the engine has.

When these sensors falter, the Jeep can end up with a flooded engine or be starved of fuel.

How To Fix?

You can use your OBD scanner to identify if the fuel injector system is malfunctioning. However, if this is the underlying problem, it’s certainly not a DIY job, and you’ll have to get your Jeep to the garage ASAP.

6. Fuel Pump Leak

If there’s a leak in the fuel pump, the engine won’t receive the fuel it needs to get going, causing it to die right after starting.

How to Fix?

This is a pretty major problem, so don’t attempt to fix this yourself. It will be a case of a mechanic removing the entire fuel tank. This should be done at the first chance you get, as spilled or leaking gasoline can be hazardous.

7. Faulty Powertrain Control Module (PCM)

The PCM is a vital component in the Jeep. It controls practically everything surrounding the engine, fuel pump, diagnostics, emission control, and transmission, amongst other things.

How To Fix?

Here’s the bad news: the PCM is probably the most complicated component of your Jeep, and there’s no easy fix. You’ll want to get the mechanic for this one. Thankfully, these days, the PCM is reliable and rarely fails.

8. Ignition Problem

A Jeep (or any car) needs sparks to ignite the gas in the cylinders to start. If these are dirty or damaged, it could be the reason your Jeep is cutting out.

How To Fix?

One easy way to fix the problem is to clean the spark plugs. You’ll need to remove them first and give them a good inspection in case there are any damaged cables; if that’s the case, the Jeep’s electrical system could be compromised.

If they are damaged, they’ll need replacing, but they’re pretty inexpensive. You can purchase a set of new spark plugs online.

Frequently Asked Questions About Why A Jeep Dies Right After Starting

As this is quite a common problem, here’s what other Jeep owners have asked about their Jeeps cutting out unexpectedly.

Why Does My Jeep Start and Then Die Right Away?

There could be several causes. For instance, there could be a fuel leak, a faulty battery, problems with the ignition, or a malfunctioning PCM.

Is It Normal for a Jeep to Start Briefly and Then Stall?

No, this is not normal. It could indicate numerous issues.

How Can I Diagnose The Cause of My Jeep Cutting Out After Starting?

You can purchase scanners online to help you diagnose the problem via a code.

The Breakdown

As you can see, there are many reasons why your Jeep might start and then die immediately.

Diagnosing the precise issue may require some patience and time. However, the problem must be dealt with immediately for safety reasons and, of course, to get you back on the road quickly.

Be sure to check components such as the battery, wiring, engine, fuel pump, and ignition.