> **Quick Answer:** A car that won't start after sitting a month is usually a dead battery. Try a jump start first. If it cranks slowly or not at all, jump it or charge it. If it cranks fine but won't fire, you may have a fuel, spark, or security issue. Most of these are fixable without a tow. But if the engine turns over and nothing happens after two tries, stop cranking and call for help.
## What To Do
1. **Check for silence or clicking.** Turn the key. Dead silence or a rapid clicking sound almost always means a dead battery. A battery can drain completely in 3 to 4 weeks with no driving. [That clicking pattern is one of the most reliable signs you need a jump or a new battery.](/car-wont-start-clicking-noise-tow-needed/)
2. **Jump the battery first.** Get jumper cables or a portable jump starter. Connect positive to positive, negative to a bare metal ground on the dead car (not the negative terminal). Let the running car charge yours for 3 to 5 minutes, then try to start. If it fires up, drive it for at least 30 minutes to let the alternator recharge the battery.
3. **If it cranks but won't start, think fuel.** Gas left sitting more than 30 days starts to degrade. The volatile compounds evaporate and leave behind a varnish that can clog the fuel injectors or float bowl. Try cycling the key to ON (not START) three or four times, holding it for 5 seconds each time, to prime the fuel pump before cranking. If the engine sputters briefly then dies, stale fuel is a strong suspect.
4. **Check for a seized engine before you crank it again.** If the car sat outside in cold weather or had a known oil leak before it was parked, the engine could be seized. Try turning the engine by hand with a breaker bar on the crankshaft bolt. If it won't budge, stop. Cranking a seized engine will destroy the starter. That car needs a flatbed, not a jump. [An engine seized while driving is handled the same way.](/engine-seized-while-driving-towing-cost/)
5. **Check the security system.** Many modern cars have an immobilizer that activates after extended non-use if the battery died. If your dashboard shows a key icon or security light when you try to start, the car may need to re-learn the key fob signal. Try holding the fob directly against the start button, or consult the owner's manual for the reset procedure.
6. **Check for flat spots on the tires.** Not a starting issue, but if you get it running and it thumps badly for the first mile, the tires sat too long in one position. Drive slowly at first. Most flat spots work out after a few miles of gentle driving. Severe flat spots require new tires before highway use.
7. **If it still won't start after a jump and a fuel prime, stop trying.** Repeated cranking drains whatever charge the jump gave you and can flood the engine. At this point you need a tow to a shop where they can diagnose fuel pressure, spark, and the battery's actual health with a load tester.
*Photo: Pexels*
## What It Might Cost
- **Jump start from roadside assistance or AAA:** Free to $50
- **New battery (installed):** $150 to $250 at most shops
- **Fuel system cleaning or injector service:** $100 to $250
- **Tow to a nearby shop:** $75 to $175 for a local tow, more for distance. [Check what towing from a parking lot to a mechanic typically runs](/towing-cost-parking-lot-to-mechanic-shop/) before you call.
If your insurance includes roadside assistance, a dead battery and tow may cost you nothing out of pocket.
*Photo: Pexels*
## Stay Safe
- Do not crank the engine more than 10 seconds at a time. Let the starter cool for 60 seconds between attempts.
- If you smell gas inside the car after cranking, get out. Wait 10 minutes before trying again. You may have flooded the engine.
- Do not jump a visibly cracked or bulging battery. A damaged battery can vent hydrogen gas and explode.
- If the car is in a garage, open the door before running a second vehicle inside for a jump start. Carbon monoxide builds fast in enclosed spaces.
- Once the car is running, [check for any dashboard warning lights before driving it anywhere](/car-wont-start-but-has-power-dashboard-lights-on/). A car that sat a month may have more than one issue waiting to surface.
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*Need roadside help? Visit [Tow With The Flow](https://towwiththeflow.com/car-wont-start-after-sitting-month-tow-or-fix/) for real answers when your car breaks down.*
Car Won't Start After Sitting for a Month: Tow or Fix It Yourself?
Photo: Pexels