Škoda Kamiq Battery Drains Overnight: Parasitic Draw Explained

Why Your Kamiq’s Battery Goes Flat Overnight

A parasitic draw means something is still awake after you lock the car. On a Škoda Kamiq, the body control module, infotainment, keyless entry, and telematics can take 20–40 minutes to go to sleep. After that, a healthy car should usually draw less than 50 mA; many are closer to 20–30 mA. If your battery is flat by morning, first test the battery itself — a weak or sulfated battery can fail even with a normal draw. If the battery passes, measure sleep current with a clamp meter and find the circuit that keeps the module network awake.

Likely Causes and What to Check First

• Aftermarket extras: dashcams, trackers, phone chargers, OBD dongles, amplifiers, or alarm add-ons that stay powered.
• Battery age and health: a battery over 3–5 years old may not hold charge overnight.
• Alternator diode: a leaking diode can drain the battery through the charging circuit.
• Door, hood, tailgate, and glovebox switches: a stuck latch or switch can keep lights or modules awake.
• Comfort/body modules and gateway: faulty software or a module that refuses to sleep is common on modern VW Group cars.
• Infotainment or radio: a unit that reboots or stays on after shutdown can pull several amps.

Start with a scan for fault codes, then do a voltage drop test at the battery terminals and charging system. Next, disconnect the negative terminal and use a clamp ammeter around the negative cable — do not use a cheap inline meter for long sleep tests. Wait for the car to go to sleep, note the draw, then pull fuses one at a time until the current drops. That points you to the circuit or module to inspect.

Is It Safe to Keep Driving?

Short answer: not ideal, but it is rarely an immediate safety crisis. If the car starts easily and the battery charges while driving, you can often drive it to a workshop soon. However, a parasitic draw will keep stressing the battery and alternator, and one cold morning it may leave you stranded. If the battery voltage rests below 12.2 V, the car cranks slowly, or you see multiple electrical warnings, get it diagnosed promptly. Replacing the battery without fixing the draw just means the new battery will also go flat.

This material is AI-generated and for informational purposes only — it does not replace an in-person diagnosis by a qualified mechanic.