Why won't my Kia Amanti start, or why does it barely accelerate after sitting?

Short answer: If the Amanti is dead, the starter makes no sound and the hazard flashers come on, the security system is probably blocking the start. One owner found opening and closing the trunk got it to start, and the driver door lock had also been acting up, so members pointed to the door wiring that feeds the alarm. If it sat for months and now won't accelerate, replace a battery that went fully flat, read the codes and check for an animal nest in the intake.

Symptom: Some days the car won't start at all and the flashers come on. Or after sitting for months it starts with a jump but won't rev and tops out around 20 mph.

What to check first

1. Watch the security indicator light and look up what it means in the owner's manual.
2. Try locking and unlocking with the key or fob, or opening and closing the trunk, to reset the alarm.
3. Check the driver door lock and the wiring where it passes from the body into the door.
4. Replace a battery that went completely flat after sitting; it often loses capacity.
5. Read the codes and check the air intake for nests if it sat for months.

Likely causes

1. Alarm or security system blocking the start. Flashers coming on and opening the trunk helping both point here.
2. Broken wiring between the body and driver door. A member said it's a very common failure point.
3. Weak battery after sitting. A fully flat battery may need replacing.
4. Animal nest in the intake or stale fuel. Suggested for the car that sat six months.

What it usually costs

No owner posted prices. Door wiring repair and alarm diagnosis are usually labor-heavy, so ask for a diagnosis first.

Is it safe to keep driving?

A car that may not restart can strand you, and one that won't go past 20 mph isn't safe in traffic. Verify with a mechanic.

DIY or shop?

DIY for battery, codes and intake checks. Door-harness and alarm work are often easier at a shop or a dealer, which can also tell you whether the alarm can be disabled.

Recalls, bulletins and complaints in plain words

• Recalls: NHTSA lists no recall for starting, the electrical system or the engine on the Kia Amanti in the model years we could check on 2026-10-25 (the recall lookup returned an error for 3 model-year queries). Check your VIN at nhtsa.gov/recalls. If your car is part of a recall, the dealer fixes it for free.
• NHTSA complaints: 38 keyword-matched complaints for Kia Amanti 2004–2009 (of 247 unique complaints queried, NHTSA complaints API by model year, queried 2026-10-25; keywords: won't start or crank, no start, click, starter, ignition switch, stall, dies, alarm, immobilizer, security, hard start). This counts complaints that mention these words. It is not a defect finding.

What owners report

• In 2005 Kia Amanti Intermittently not starting on Car Talk, a 2005 Amanti with 139,000 miles sometimes wouldn't start; the flashers came on and the starter made no sound. The owner found that opening and closing the trunk made it start, five or six times. The driver door lock had also failed. Members suspected wiring where it runs from the body into the door, and said to learn what the security light means from the manual.
• In 2006 Kia Amanti - Sat 6 months -now this on Car Talk, a 2006 Amanti that sat six months needed a jump, then wouldn't rev and only reached about 20 mph. Members said a battery that went fully flat should probably be replaced, to read the check engine codes, to check for an animal nest in the intake, and to consider whether the gas had gone stale.

Quick tip

Flashers coming on at a no-start is the car telling you its alarm is involved. Start there before testing the starter.

Vehicle focus: 2004–2009 Kia Amanti (3.5L and 3.8L V6).

Safety / mechanic note

A car limited to low speed shouldn't be driven in traffic. Verify with a mechanic.