My Jeep Won’t Start: 20 Causes & Fixes!

Jeep Mechanic

Table of Contents


When your Jeep doesn't start and time is of the essence, it might be annoying and tense. While some causes for a Jeep not starting are easy to diagnose and fix, some need the help of a skilled mechanic. In this piece, we'll address several usual factors why your vehicle won't start and supply tips for diagnosing and fixing them yourself. Let's have your Jeep functioning and on the streets!

Chat with a Jeep Mechanic

Prior to diving in, if you'd rather skip to the end and directly obtain the solution, you're welcome to have a direct conversation and ask a Jeep mechanic concerning why your vehicle refuses to start and the ways to repair it. At the bottom right-hand corner of this site, there's a live chat feature that links you with expert mechanics reachable anytime to answer questions and offer advice. Thus, if you require quick, affordable assistance with your automobile, it's an excellent option in which you can ask mechanics as many questions as you like. With that said, let's get stuck in!

1: Dead Battery

Dead battery

A frequent issue your automobile refuses to start is a drained battery. Signs that your battery may be dead consist of no engine turnover or clicking noise while turning the key within the ignition. To resolve this issue, jump-starting your Jeep, or changing the dead battery might be required – keep jump-start cables ready for such situations!

2: Neglected Alternator

Car alternator causing battery to drain

An alternator is responsible for charging your Jeep's battery when it's in operation. Should it malfunction, there might not be enough juice to get your Jeep started. Symptoms that there might be an issue involve an illuminated battery indicator on the Jeep's dashboard, weaker headlights, or even possibly no power at all. Fixing this problem correctly demands expert assessment and fixing. The cost of this diagnosis and repair hinges on the technician and the required parts. Should you require guidance about this, you can have a chat with an expert mechanic online at any time.

3: Clogged Fuel Filter

Clogged Fuel filter

A fuel filter plays an essential role in clearing out unwanted particles from the fuel before getting to the engine, so, when it's obstructed, it can decrease efficiency or stop your Jeep from starting completely. Indications that your Jeep's filter may be blocked include lack of power, stalling, or no start at all. Fixing a clogged fuel filter on your own or with help from an experienced mechanic should take only moments. You can get recommendations and a thorough walkthrough on fixing this issue through a chat with a skilled mechanic via the Internet.

4: Malfunctioning Starter Motor

car starter motor faulty

Your Jeep's starter motor is responsible for starting an engine when you turn the key in the ignition. If it malfunctions, it's likely the explanation as to why your vehicle doesn't start or you might notice grinding noises when turning the key. The remedy to a defective starter motor is a replacement; this calls for expert assessment and repair. The expense for this can greatly vary based on your individual circumstances. You can inquire an online mechanic for guidance on cost estimates for your unique scenario, so you can be prepared as you head to your neighborhood mechanic's place.

5: Neglected Ignition Switch

Faulty ignition switch

The ignition switch handles starting and keeping your automobile's engine running smoothly. In case it fails, it can hinder your vehicle from starting or make it stall during driving. Indications that an ignition switch is malfunctioning involve no reaction when turning the key in the ignition switch and the engine not turning over. To resolve this problem, a skilled technician's evaluation and resolution may be all that's necessary. Talk to an online or local mechanic to have this issue checked and fixed.

6: Damaged Spark Plugs

faulty spark plugs car

Spark plugs ignite the fuel inside the cylinders of an engine. Should they get worn or get damaged, they could fail to produce a spark and this might keep the engine from starting. Signs of faulty spark plugs include an uneven idle, poor acceleration, or challenges when you try to start your vehicle. To address this problem, replace them with new ones; this can be done by an experienced professional or a person who prefers to handle it themselves. This needn't be a costly or challenging repair; if you want to do it yourself, you can get guidance and be walked through the process whenever you want by consulting with an online mechanic.

7: Fuel Pump Failure

faulty fuel pump

A fuel pump handles supplying fuel to the engine, and when it malfunctions, your automobile won't start or run correctly. Indications that there might be a problem involve no response while turning the key in the ignition, engine halting, or misfiring. The sole solution for a malfunctioning fuel pump involves changing it – this requires skilled evaluation and repair by experienced mechanics.

8: Faulty Distributor Cap

faulty distributor cap

Your Jeep's distributor cap takes care of transporting electrical current from the coil to your spark plugs. If this component breaks down, your engine may not receive proper ignition. A malfunctioning distributor cap can prevent the engine from starting properly, resulting in misfiring, poor acceleration, and challenges starting it. The answer to a malfunctioning cap is replacing it, which can be achieved by either a proficient technician or a do-it-yourselfer with fundamental know-how and tools to cut costs. For real-time stepwise instructions on finishing the procedure and spending less, you can consult an online mechanic and obtain guidance.

9: Ignition Coil Failure

faulty ignition coil car

Your Jeep's ignition coil is responsible for creating the electrical current that sets off fuel in an engine's cylinders. If it breaks down, your engine might not start or misfire. Indications of a malfunctioning coil include an absence of reaction while turning on the ignition, engine misfiring sounds, and sluggish acceleration. To handle this situation professional diagnosis and service are typically required; changing an ignition coil usually resolves all such concerns. How much this will cost, depends on the repair professional and your individual situation. You can request a cost estimate or another opinion on the price from a virtual mechanic to aid in the procedure.

10: Broken Timing Belt

broken timing belt car

A timing belt handles syncing the movement of the engine's valves and its pistons. If it snaps, chances are the explanation for your Jeep won't start, is that the engine may not start or run correctly. Symptoms that there might be a concern involve no response when engaging the key, misfiring, or stalling your engine. To address this situation, expert assessment and service are needed; changing the belt requires both. If you want a cost estimate for your unique circumstance, feel free to ask for guidance from an online mechanic, so you are well-prepared when you visit a nearby garage.

11: Failed Camshaft Position Sensor

camshaft position sensor.

The camshaft position sensor handles keeping track of a camshaft's position and transmitting that data to the engine control module. If this sensor fails, when you try to start your Jeep, the engine might not start or operate properly. Signs might involve a lack of response when using the ignition key, misfiring noises from the engine, or poor acceleration. A professional diagnosis and service for a broken camshaft position sensor typically require changing it out with a replacement. The expense for this depends on your situation, you can acquire an estimate from a nearby garage or an online mechanic.

12: Failing Crankshaft Position Sensor.

Car mechanic hands replacing a camshaft position sensor.

A crankshaft position sensor is responsible for keeping track of the position of your engine's crankshaft (crank) and relaying that data to the Jeep's engine control module. If the sensor malfunctions, your Jeep might not start or run correctly, with issues cranking; signs encompass no response when turning the key in the ignition, misfiring noises from the engine, or weak acceleration. The exclusive remedy for a faulty crankshaft position sensor is replacing it – which requires a skilled mechanic to evaluate and resolve. You can get advice regarding your unique circumstances from a local mechanic or through online platforms.

13: Faulty Mass Airflow Sensor

faulty air flow sensor

The mass airflow sensor is responsible for calculating the volume of air flowing into the engine and sending that data to the engine control module. If it malfunctions, it is likely the culprit your Jeep is experiencing starting or running issues. Symptoms of a defective airflow sensor include sluggish acceleration, misfiring sounds from the engine, or difficulty starting it. To address this issue, a professional mechanic is required a skilled mechanic to assess and fix the defective mass airflow sensor. Consult a local repair shop or through online platforms for guidance and cost estimates that are individual to you.

14: Computer System Malfunction

faulty computer system in car

Today's automobiles heavily rely on their engine control unit for various important tasks, like running and starting the engine as well as regulating emissions and transmission. If this component fails, it might result in multiple complications such as an unresponsive engine, warning indicators on the dashboard, poor acceleration, or trouble getting the engine to start. To fix a problem with the engine control unit, it is advisable to have it diagnosed and repaired by an experienced technician.

15: Blown Fuses

blown fuse in car

A blown fuse may also be the culprit regarding your Jeep failing to start. Automotive fuses protect different electrical components in your automobile, and if ever one blows, that particular component such as the ignition system and might not work properly. Symptoms that a blown fuse include no response when turning the ignition key in the ignition, no functioning lights or accessories, as well as an intermittent misfiring engine. To check for a damaged fuse, check the fuse box situated either in the engine compartment or below the dashboard. If you find a damaged fuse, change the fuse with an identical rating. Though fixing a fuse is often an easy DIY project, take note of the fact that repeatedly blowing fuses could point to an underlying electrical problem that needs professional diagnosis and repair. For more guidance with this issue or someone to guide you through the process live, feel free to speak to one of our online mechanics.

16: Clogged Air Filter

clogged air filter in car

The air filter is accountable for blocking dirt, debris, and other pollutants from penetrating your engine. When it becomes clogged, it can limit airflow to the engine, which could cause problems starting or perhaps suboptimal performance. Symptoms of a clogged filter consist of reduced acceleration, difficulty starting your engine, or lower fuel efficiency. To address this concern, it is necessary to swap out the air filter, something simply done by either an experienced mechanic or someone who enjoys DIY and understands what they're doing.

17: Dirty Fuel Injectors

Dirty Fuel Injectors

Fuel injectors are responsible for delivering gas to an engine. If they become dirty or blocked, it may prevent adequate delivery of fuel to begin or even run the engine correctly. Indications that your injectors might be dirty are a lack of response when turning on the key in the ignition, slow acceleration, or even engine stalling. The remedy for dirty injectors is cleaning, which may be completed by a professional mechanic.

18: Faulty Engine Control Module (ECM)

Car mechanic team using laptop boosting car engine at auto repair shop

The engine control module (ECM) handles managing and regulating many Jeep systems, including the performance of the engine along with emission levels. When the engine control module stops working or even experiences problems, it may lead to multiple problems involving the starting or running of the engine. Symptoms that indicate there is an issue with an ECM consist of warning lights on the dashboard, slow acceleration or even difficulty starting the engine. To fix the issue with a malfunctioning ECM, consult a skilled mechanic who is able to properly diagnose as well as fix the issue.

19: Bad Fuel Pump Relay

bad fuel pump relay

The fuel relay is responsible for providing power to the pump, so in case the relay fails, the fuel pump won't get adequate power to work which can result in issues with starting the engine. Indications that there's something wrong include no response while turning your key into the ignition, engine stalling, or even engine misfires. To resolve a bad relay, an expert or even experienced DIYer could replace it with proper instructions or even guidance.

20: Failed Throttle Position Sensor

Faulty throttle position sensor

The throttle position sensor handles observing the throttle position as well as relaying that specific info to the engine's control module. In case the sensor breaks down, your Jeep could not necessarily begin or even run effortlessly. Signs of a failed throttle position sensor comprise an unresponsive state when turning the key into the ignition, poor speeding up, or even stalling. Resolving a malfunctioning position sensor requires skilled diagnosis as well as fixing by way of a skilled Jeep mechanic.


In summary, when your car's not turning over, it can be a frustrating and nerve-racking experience. Yet, you will find several likely factors and fixes regarding the reason why this might take place. By means of understanding the usual reasons as well as signs associated with a not starting car, you can precisely identify the problem and locate a highly effective fix. Regardless of the reason for the automobile failing to start, whether it be a drained battery, fuel system malfunction, faulty starter motor, or even ignition problem – you will find actions you are able to take to acquire back on track securely. Always use caution when working on your car as well as don't hesitate to seek expert help if required. We trust this particular manual has given sufficient information so you can swiftly diagnose what is preventing the engine from starting again in order that the problem can be fixed immediately. Don't forget, if you need extra help or advice, feel free to use our mechanic online service!

when to ask a mechanic


FAQs (Frequently Asked Questions)


What steps should I take if my Jeep doesn't start?

If your Jeep won't start, initially examine the battery, fuel, starter, as well as ignition system for problems. If you are unable to get your Jeep to a nearby mechanic, you may speak to one on the internet initially.

How do I know if my Jeep battery has died?

Symptoms of a dead battery consist of problems starting the engine or even hearing clicking as you turn on the ignition. If you are unsure, consult an online or local mechanic.

What are the signs of a blocked fuel filter in a Jeep?

Indications of a blocked fuel filter include reduced power, stalling or even difficulty starting the Jeep. If you are not sure, talk to a local or online mechanic.

How often should I replace my Jeep battery?

Car batteries have different lifespans, however, in general, it's suggested to replace car batteries every 3-5 years to prevent problems when starting up your vehicle.

Can a malfunctioning mass airflow sensor cause my Jeep to not start?

A faulty mass airflow sensor might have an effect on engine performance, it's not likely to lead to problems with starting up your Jeep.

How do I jump start a Jeep?

In order to jump start your Jeep, you require jumper cables and a second car with a working battery. Attach the cables correctly in their designated order, turn on the working car, wait for a short while, then restart your car. Consult with an online mechanic to give you guidance and walk you through the process of jump starting your Jeep.

Will a faulty alternator prevent my Jeep from starting?

Unfortunately, yes. If the alternator is faulty, the battery might not have sufficient power to properly start the engine. Speak to a local or online mechanic for guidance regarding this matter.

How do I know if my spark plugs need replacing in a Jeep?

Indications of bad spark plugs consist of rough idle, reduced acceleration, or trouble starting your Jeep.

What Should I Do If My Jeep Stalls While Driving?

In the event, your Jeep stalls while driving, first try to safely pull over to the side of the road, switch off the engine and attempt to restart it. If that doesn't help, call for professional help to assist you.

Does a broken timing belt cause engine damage in a Jeep?

Unfortunately, that kind of damage could be costly to fix if the timing belt in your Jeepnis broken. If you are not sure, consult an online or local mechanic.

Chat With a Mechanic?

24/7 Expert Mechanics To Help Solve Any Issues Your Having.


Chat With a Mechanic?

24/7 Expert Mechanics To Help Solve Any Issues Your Having.