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2017 Mini Cooper S (F56) Battery Drain & Start/Stop Malfunction

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Mike T. · rep 0 · May 25, 4:58 AM · 1 replies · solved · Question

Vehicle: 2017 Mini Cooper S F56

Hey everyone,

I've been having some really frustrating issues with my 2017 Mini Cooper S (F56). For the past few weeks, the battery seems to be draining much faster than usual. If I leave it parked for more than a day, it struggles to start, and sometimes needs a jump.

On top of that, the auto start/stop function completely stopped working about a month ago. I used to love that feature for city driving. Now, it just doesn't engage at all, and I occasionally get a 'Charging System Malfunction' warning on the dashboard, though it usually goes away after a few minutes.

Could this be a bad battery, or something more serious like the alternator or a parasitic draw? Any advice on what I should check first? I'm trying to avoid an expensive trip to the dealer if it's something I can diagnose myself.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:58 AM

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Hello Sarah,

It sounds like you're experiencing common symptoms of a failing battery or a charging system issue. Given the age of your 2017 Mini Cooper S, the original battery might be nearing the end of its life, but other factors could be at play.

Here's a breakdown of what to check:

  1. Battery Health Check:

    • Voltage Test: Use a multimeter to check the battery voltage after the car has been off for several hours. A healthy battery should read around 12.6 volts. If it's consistently below 12.0 volts, it's likely weak.
    • Load Test: Many auto parts stores offer free battery load testing. This will accurately determine if the battery can hold a charge under load.
    • Parasitic Draw Test: If the battery is good but still drains, you might have a parasitic draw. This involves disconnecting the negative battery terminal and connecting an ammeter in series between the terminal and the cable. Pull fuses one by one until the current draw drops significantly to isolate the circuit.

  2. Charging System Inspection:

    • Alternator Output: With the engine running, check the battery voltage. It should be between 13.5 and 14.5 volts. If it's not, your alternator might be failing.
    • Belt Condition: Inspect the serpentine belt for cracks, fraying, or looseness. A slipping belt can prevent the alternator from charging effectively.
    • Wiring: Check the main battery cables and alternator connections for corrosion or damage.

  3. OBD-II Codes:

    • Use an OBD-II scanner. A 'Charging System Malfunction' often triggers codes like P0562 (System Voltage Low) or P0563 (System Voltage High). These codes will point you towards a battery or alternator issue.

When to See a Shop: If your battery tests fine, and you're still experiencing rapid draining or inconsistent charging, it's best to take your Mini to a qualified mechanic or Mini specialist. A parasitic draw can be tricky to find, and diagnosing complex alternator or voltage regulator issues requires specialized tools. Ignoring these warnings can lead to being stranded or even damage to other electrical components.

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