Peugeot 5008 II Battery Draining Overnight: What Your Car Is Telling You

Start with the battery, not the wiring

If your Peugeot 5008 II is flat every morning, I know how frustrating it is. Before you chase a ghost draw, test the battery properly: a weak or aged AGM battery can fail a load test and make a normal sleep current look like a fault. Check resting voltage after the car has slept, the battery age, terminals, and the charging system. A tired battery plus short trips is a very common pair on these cars.

What a parasitic draw test looks like

A proper draw test means letting the 5008 II go fully to sleep, often 30 to 60 minutes after locking, then measuring current with a clamp meter. Many cars settle around 20 to 50 mA; a higher reading means something is still awake. From there, check fuses by voltage drop rather than pulling every fuse, and scan all modules for fault codes. Look first at:

• Aftermarket kit: dashcams, trackers, alarms, phone chargers, and towbar wiring are classic overnight drains.
• Latches and switches: bonnet, tailgate, door, and glovebox microswitches can leave lights or modules awake.
• Infotainment and telematics: radio, navigation, and emergency call units that fail to sleep.
• BSI, BPGA, and CAN network: body control or battery management faults can keep the network awake.
• Alternator diode leak: less common, but it can drain the battery through the charging circuit.

What I would check first on a 5008 II

On this model I would start with a full fault-code scan, then watch sleep current while locking the car and leaving it undisturbed. Check the tailgate and bonnet latches, interior lights, glovebox light, and any recent electrical work. Keyless entry and hands-free tailgate systems are also worth watching. If the draw appears only after a door or tailgate is opened, the latch or switch is a strong suspect.

Can you keep driving?

Short term, yes, if the car starts reliably and you have no warning lights, hot battery, or burning smell. But do not ignore it: repeated deep discharge damages the battery, stresses the BSI and starting system, and can leave you stranded. If it is dying overnight, get it diagnosed soon rather than relying on jump starts.

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