Burning electrical smell inside or under the car

Symptoms

• Sharp burning plastic or rubber smell
• Smell gets stronger with certain accessories running
• Smoke or haze visible from under the dash or hood
• Warning lights accompanying the smell

Likely causes

• CommonOverloaded or shorting wiringWires carrying too much current or touching bare metal can overheat and melt insulation.
• CommonFailing electric motor (blower, window, etc.)A motor nearing failure can overheat and produce a burning smell.
• PossibleSlipping serpentine beltA slipping belt can create a burning rubber smell that seems electrical but isn't.
• PossibleFailing alternator or batteryElectrical components under strain can overheat and produce a distinct burning odor.
• PossibleAftermarket wiring installed incorrectlyPoorly installed accessories are a common source of overheating wires.

What to do

1. Pull over safely and turn off the engine as soon as it's safe to do so.
2. Do not open the hood immediately if you see smoke; wait a few minutes for things to cool.
3. Check for visible smoke, melted plastic, or scorch marks once it's safe to look.
4. Turn off all accessories (AC, stereo, heated seats) before restarting if you must move the car a short distance.
5. Avoid continuing to drive the car if the smell persists or worsens.
6. Have the vehicle towed to a shop rather than risking a fire by continuing to drive.
7. Mention exactly when the smell started and any accessories in use at the time to help diagnosis.
8. Have a shop inspect wiring, motors, and the charging system with proper tools.

When to call a pro

Any burning electrical smell warrants a professional inspection immediately; this is not a DIY diagnosis given the fire risk.

Safety