Howtoo Logo
2021 Kia Forte
2021 Kia Forte
EX - Inline 4 2.0L
Bryan specialist avatar

Have a Question? Ask a Specialist

See what I can do

Make Money

With HowToo

OnOff

Here is just the beginning of what I can do!

Select one to see me in action

Vehicle Features

Image Vehicle Features

How do I connect my phone to my stereo?

Vehicle Information

Image Vehicle Information

What is my horsepower and torque

Image Recognition

Image Image Recognition

What is this warning light on my dash?

Troubleshooting

Image Troubleshooting

I have a P0300 engine code

Vehicle Recognition

Image Vehicle Recognition

What vehicle is this?

Find shops near you

Image Find shops near you

Find a shop to do this repair

Vehicle Talk

Image Vehicle Talk

What’s your favorite vehicle of all time?

2021 Kia Forte Won’t Start: How to Diagnose No-Crank vs Crank-No-Start

Step-by-step troubleshooting for battery/ground checks, starter circuit, key fob & immobilizer warnings, and fuel pump clues

2021 Kia Forte Won’t Start: How to Diagnose No-Crank vs Crank-No-Start

Step-by-step troubleshooting for battery/ground checks, starter circuit, key fob & immobilizer warnings, and fuel pump clues

My 21 Kia forte is not starting. I replace battery, starter, water pump, timing belt and starter relay fuse. I also changed the battery’s in my key fob.
Orion Logo White
Orion Logo White

Forte - No-Start Diagnosis 🔎

Got it. Since you’ve already replaced a lot of parts, the next step is to separate “no-crank” from “cranks-but-won’t-start”. That tells us which system to focus on (starting circuit vs fuel/ignition/immobilizer).

Two quick questions (answer both):

  • 🔧 When you press the brake and push the Start button (or turn the key), does your Forte crank (engine spins “rr-rr-rr”), or is it silent/click?
  • 🔑 Does the dash show a key/immobilizer warning (key icon), or does it say “Key not detected”?

Forte - Checks You Can Do Now ✅

While you reply, do these in order (no special tools):

  • 🧯 Make sure it’s in Park and press the brake firmly. Try starting in Neutral too (a bad range switch can block starting).
  • 🔋 Battery connections: confirm both terminals are tight and clean and the clamps don’t rotate by hand. Also check the negative cable where it bolts to the body/engine—a loose ground can cause a total no-start.
  • 💡 Headlights test: turn headlights on, then try to start.
    • If lights go very dim or out → likely power/connection issue even with a new battery.
    • If lights stay bright but no crank → likely control issue (brake switch, start relay control, immobilizer, neutral safety, etc.).
  • 🔑 Key fob start strategy: try starting with the fob touching the Start button (some Fortes can read the transponder even if the fob signal is weak).
  • 📟 If it cranks but won’t start: listen at key-on for a 2–3 second fuel pump hum from the rear seat/trunk area.

Important Note About the “Timing Belt” ⚠️

Your Forte’s 2.0L uses a timing chain, not a belt. If timing components were worked on or something was misassembled after the water pump job, that can cause a crank/no-start (or abnormal cranking speed). Tell me: does it crank faster than normal, slower than normal, or normal?

Reply With These 4 Items 📝

  • 🧠 No crank or cranks but won’t start
  • 🔑 Any key/immobilizer message or icon
  • 💡 Headlights during start: dim a lot or stay bright
  • 🔊 Cranking sound: normal / fast / slow
Parts
Tools
Menu
Videos
Earn