Symptoms
- Cable feels warm to hot while a device charges quickly
- Heat is concentrated at one spot rather than spread evenly
- Cable is a thin or low-quality unbranded type
- Charging speed drops as the cable heats up
Likely causes
- CommonCable isn't rated for the wattage being pushed through itThin, cheap cables can overheat when used with high-wattage fast chargers or laptop charging.
- CommonDamaged internal wiring increasing resistanceA partially broken wire generates heat at the damage point.
- PossibleCharging a high-power device like a laptop on a phone-rated cableLaptop charging draws much more current than typical phone cables are built for.
- PossiblePoor quality or counterfeit cable lacking proper gauge wiringBargain cables often use thinner wire than their rating implies.
What to do
- Feel along the entire cable length; if heat is concentrated at one specific spot, that suggests internal damage.
- Check the cable's rated wattage against what you're actually charging (for example, a laptop needs a cable rated 60W or 100W, not a basic 18W phone cable).
- Stop using any cable that gets uncomfortably hot, discolors, or has a burning smell.
- Switch to a cable explicitly rated for the wattage of your fast charger or laptop.
- Replace cheap or unbranded cables used for high-power charging with quality ones from reputable brands.
Tools and parts
- None required
High-wattage rated USB-C cableSearch: “USB-C 100W cable”
When to call a pro
No professional repair applies; replace an undersized or damaged cable rather than continuing to use it.
Safety
Use caution
Stop using a cable that becomes hot, especially with a concentrated hot spot, discoloration, or a burning smell, and replace it.