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Burning Plastic Or Electrical Smell

A sharp smell of burning plastic or hot wiring can mean an electrical fault such as an overheating wire, connector, fuse or blower resistor. It can also be a plastic bag stuck on the exhaust.

Short answer · What should I do if I smell burning plastic in the car?

Pull over safely and switch off the engine. If you see smoke from the dashboard or under the bonnet, leave the car and keep your distance. If there is no smoke, look under the car for plastic stuck on the exhaust. An electrical smell that returns when you use certain functions, such as the heater fan, points to an overheating part in that circuit.

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Safe checks you can do

  1. Stop and switch offTurn off the ignition to cut power to most circuits.If there is smoke or flame, get everyone out and call for help.
  2. Look under the carA plastic bag melted onto the exhaust smells similar.
  3. Note what was switched onFan, seat heaters or chargers can point to the circuit.

Questions that narrow it down

  1. Does it smell when the fan is on?The blower motor or resistor may be overheating.
  2. Was an accessory recently fitted?Poor wiring is a common cause.
  3. Are fuses blowing?A short circuit is likely.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Overheating wire or connectorPoor contact or overload.
  2. Failed blower resistor or motorSmell through the vents.
  3. Aftermarket accessory wiringUndersized cables or no fuse.
  4. Plastic stuck on the exhaustCommon after driving over litter.
  5. Battery or alternator overheatingSharp smell under the bonnet.

Questions about Burning Plastic Or Electrical Smell

Can I keep driving if the smell goes away?

Have it checked before driving far. Electrical faults can return without warning.

Does a car fire start quickly?

It can. Smoke and smell are reasons to stop and get out.