The silence that fills your inactive Chevy when you turn the key and it won't start can be extremely annoying. A Chevy that fails to start will leave you stranded and clueless about the issue. The good news is that a number of familiar culprits make an Avalanches fail to start, and you can fix a lot of them yourself or with a mechanic's assistance.
In this comprehensive guide, we're going to look at the fourteen most common reasons your Chevy Avalanche won't start and provide useful suggestions to get your car running again.
The most common cause a Chevrolet doesn't crank is a dead or drained battery. Your battery provides the initial jolt of electricity to turn over the engine and get it running.
Signs of a dead battery:
- Silence upon turning the key – no engine cranking
- Accessories not powering on
- Difficulty starting in cold weather
The Fix: Keep jumper cables on hand for a dead battery situation. Jump starting your Chevrolet Avalanche using a good battery or jump box can deliver enough charge to get it cranked.
You can also clean dirty battery terminals if they prevent a good connection. If problems persist, have your battery tested – it may need recharging if worn out.
If your battery checks out but your Chevy Avalanche still won't crank, the issue may be a bad alternator. This vital part charges your battery while driving and powers the electronics.
Clues of a bad alternator:
- Battery warning light coming on
- Electronics fading
- Hard time starting, particularly following short trips
The Fix: Get your alternator inspected immediately by a mechanic. A bad alternator can rapidly deplete your battery. This will need to be replaced by an experienced mechanic.
Faulty Spark Plugs
Spark plugs ignite the air/fuel ratio in the cylinders to run your car. When they are dirty, bad, or corroded, your Avalanche may not start due to no spark.
Signs of bad spark plugs:
- Poor fuel economy
- Rough idle
- Engine hesitating
The Fix: Spark plugs need regular replacement as they wear out. Most last 30k+ miles. Have your plugs checked and swap any faulty ones. Using quality gas helps avoid buildup.
Problems with parts like the switch, lock cylinder, fob, or wiring can prevent your Chevrolet from cranking.
Symptoms of ignition trouble:
- No noise upon turning key
- Dashboard malfunctioning
- Key won't turn
The Fix: For fob issues, try the battery. For other problems, have the system inspected and repaired professionally. If you need a new Chevy key fob you can get one online here.
The starter motor engages when you turn the key to start the engine. If it's worn out, your Chevy Avalanche may not crank.
Symptoms of a bad starter:
- No noise upon turning key
- Clicking but no turnover
- Unusual noises
The Fix: Have your starter tested and repaired if faulty. This requires the help of a professional mechanic to diagnose and repair.
Transmission Not in Park/Neutral
If your gearbox isn't in Park or Neutral, your Chevy's safety features will prevent it from starting.
The Fix: Shift into Park/Neutral and try again. If it only starts in one gear, you may have a faulty neutral safety switch needing repair. This will need to be repaired by a local mechanic near you.
Blocked or Clogged Fuel Filter
A blocked fuel filter can restrict fuel flow to the engine, preventing your Chevrolet Avalanche from starting.
Symptoms of a clogged filter:
- Difficulty starting
- Engine misfiring
- Decreased fuel economy
The Fix: Change the filter when due or if suspected clogged. Use quality gas and change regularly. You can have a local mechanic repair this for you, or repair it yourself, maybe with the help and guidance of an online mechanic.
Faulty Fuel Pump
The fuel pump delivers gas from the tank to the engine. If it fails, your Chevrolet won't start due to no fuel.
Symptoms of a bad pump:
- No sound upon turning key
- Hard time starting
- Stalling when running
The Fix: Have your pump tested. If faulty, a mechanic near you will need to replace it.
Proper compression is required to combust the air/fuel mixture. Low compression from leaks can cause a no start.
Symptoms of compression issues:
- Difficulty starting
- Rough idle
- Lack of power
The Fix: Testing can confirm low compression. For diagnostics and carrying out this repair, a local mechanic is usually needed and will have to replace the worn engine components.
Timing Belt Failure
The timing belt keeps the camshaft and crankshaft. If it snaps, the valves and pistons aren't synchronized properly and your Chevrolet Avalanche won't start.
Symptoms of a bad timing belt:
- No start
- Unusual clicking sound
The Fix: Have your belt checked and fixed right away if broken. This requires a local professional mechanic to replace the timing belt of your Chevy Avalanche.
Detached or Loose Battery Cable
Symptoms of a bad cable:
- Corroded terminals
- Power loss from wiggling cables
- Frayed wiring
The Fix: Clean corroded terminals and tighten loose connections. Damaged cables need replacement. You can get expert Chevy mechanic advice and guidance online or with a local mechanic.
Relays control power to components like the starter, fuel pump, and computer. Failure can prevent your Chevy Avalanche from starting or running right.
Diagnosing relay problems:
- Swap relays to test
- Have relays checked by a mechanic
The Fix: Faulty relays must be replaced, often after a larger diagnostic. You will likely need a local mechanic to diagnose if the faulty relay is preventing your Chevy from starting.
Empty Gas Tank
Running your tank completely empty can cause a no-start due to lack of fuel. This seems obvious however it often happens because of an inaccurate or broken fuel gauge.
The Fix: Keep your tank at least 1/4 full to avoid unexpected emptying. If issues persist, have your fuel sender unit checked by a professional mechanic.
Sometimes an engine can flood with too much fuel, preventing starting due to wet spark plugs. This is most common in older carbureted engines.
The Fix: Press the gas pedal fully and crank briefly to clear the system so the plugs can spark. If problems continue, have the carburetor adjusted by a professional local mechanic.
Top 3 Ways To Get a Mechanics Help
With so many potential causes for a no start situation, it can be challenging to determine the exact cause yourself. In some cases, seeking aid from an experienced mechanic can be time-saving and give you peace of mind.
These are the 3 ways to get a mechanic's help in starting your Chevy again.
1. Local Auto Repair Garage Near You
This is the regular way to get it repaired, however, it can be very wasteful in time and money, transporting your vehicle to them, plus expensive garage fees as they often have expensive overhead costs etc, that they have to pass on to the customer.
2. A Mobile Mechanic Near You
Having a qualified mobile mechanic come to your Chevy and repair it on-site can be a great time and money saver. The best mobile mechanics we can recommend in the USA are RepairSmith and YourMechanic. We have recommended them thousands of times, and they both have great prices, services and coverage across most of the USA.
In the UK the best mobile mechanic we can recommend is Fixter, they will come pick up your car, take it get repaired, and deliver it back to you. You can get an instant free quote on their official websites by clicking the name. We have tested, vetted, and can heartedly recommend each of these services to get your Chevy Avalanche|Chevrolet Avalanche starting again ASAP.
3. Chat with a Chevy Mechanic Online
This is a wonderful option for most DIYers or car buff. It's many times a straightforward repair you can do on your own, like switching out or recharging the battery. In these situations, if you know what to do step by step, you can do it on your own, you don't need to pay a mechanic in person. Well, it's your fortunate day, an online mechanic can supply all the assistance, advice, and recommendations you require, instantly by online chat. You can then carry out the straightforward repair yourself.
The top online mechanic we propose is JustAnswer, and through our link, you can get a trial of their service for just $5, request endless inquiries for a week, get the assistance you require, and you don't have to keep going with the service after that. We adore JustAnswer for this reason, specialist auto mechanic help for just $5 is an unmatchable price.
The licensed mechanics at JustAnswer's Ask a Mechanic service are available 24/7 to provide remote diagnostics and recommendations. The perks of consulting with a mechanic online are:
- Convenience: Get help from home without having to schedule an appointment or wait at a shop.
- Fast answers; Mechanics answer back rapidly with possible causes and solutions based on your description.
- Cost savings: Pay per question rather than full diagnostic fees – great for basic troubleshooting.
- Documentation: All conversations are saved in writing, providing helpful reference.
- Expert help; Seasoned licensed mechanics have the expertise to address Chevy Avalanche|Chevrolet Avalanche no starting issues with ease.
You will get matched with the best auto mechanic for your particular case, it doesn't matter if it's an Avalanche or your Chevrolet Aveo won't start, the expert Chevy mechanic you are paired with, will be the best for the job.
So next time you find yourself searching online for something like “why won't my Chevy start“, consider our mechanic Chrevrolet service. In just minutes, you can access expert Chevrolet knowledge to help get your beloved Avalanche starting again.
FAQs (Frequently Asked Questions)
Why is my Chevy car not starting but I have power?
If your Chevrolet won't start but the lights and electronics come on, the most likely causes are issues with the starter system, ignition switch, or neutral safety switch. Defective ignition components prevent the engine from turning over even when battery power is present.
Why does my Chevy have power but won't turn over?
When your Chevy has power to the electronics and dashboard but won't crank when trying to start, the problem is often a bad starter system or related wiring problem. This prevents the starter from activating to turn the engine over for starting.
What would make my Chevy car suddenly not start?
Sudden no-start issues can occur from disconnected battery cables, fuel pump or relay failure, broken timing belt, or an empty gas tank. These urgent problems can arise without warning and prevent your Chevy's engine from starting.
Why doesn't my Chevy car start but the battery is fine?
With a good battery, the culprit may be a bad alternator not charging the system, bad spark plugs providing no ignition, or a fuel delivery issue preventing combustion. Your Chevy's engine needs air, fuel, compression and spark to run.
What are symptoms your Chevy starter is bad?
Symptoms of a bad starter include no noise when turning the key, a single click but no cranking, unusual grinding sounds, and difficult cranking. These indicate starter failure and the need for replacement by a local mechanic.
Why doesn't my Chevy car start but battery and alternator are good?
If the battery and alternator check out, common causes are bad spark plugs, blocked fuel filter, blown fuse, immobilizer problem, and starter relay failure. Thorough diagnostics of all electrical and fuel systems are needed by a qualified local mechanic.