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Persistent Battery Drain on My 2020 XC60 T5 Momentum

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Emily N. · rep 0 · May 22, 5:20 AM · 1 replies · solved · Question

Vehicle: 2020 Volvo XC60 T5 Momentum

Hey everyone,

I'm having a really frustrating issue with my 2020 Volvo XC60 T5 Momentum. If I don't drive it for more than 2-3 days, the battery is completely dead. I've had to jump-start it multiple times now, and it's getting old fast. I've checked to make sure no lights are left on, and nothing obvious is plugged into the outlets.

Has anyone else experienced a persistent battery drain on their newer Volvo, especially an XC60 from this generation? I'm wondering if there are any known TSBs (Technical Service Bulletins) or recalls related to this problem. I've heard some talk about the Sensus system or other electronics causing parasitic draws.

Before I take it to the dealership, I wanted to see if there are any common culprits or diagnostic steps I could try myself. Any advice on what to look for or mention to the service department would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:20 AM

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ClearTheCode admin answer:

Persistent battery drain on modern Volvos, especially the 2016-2026 models with advanced electronics like the Sensus infotainment system, is a concern we've seen discussed. Here's a breakdown of potential causes and steps:

  1. Initial Checks & Diagnostics:

    • Battery Health: First, have your battery tested. Even a relatively new battery can fail prematurely. Most auto parts stores offer free battery and charging system tests.
    • Parasitic Draw Test: If the battery is good, you'll need to test for a parasitic draw. This involves using a multimeter to measure current draw from the battery with the car off and all doors closed. A healthy draw should typically be under 50mA (0.05 Amps) after the car's modules have gone to sleep (which can take 15-30 minutes). If it's significantly higher, you can pull fuses one by one to isolate the circuit causing the draw.
    • OBD Codes: While a parasitic draw itself might not trigger a specific OBD-II code, a failing module that's causing the draw might log internal fault codes (e.g., U-codes or B-codes) that a dealership's VIDA diagnostic system can read. A generic OBD-II scanner might not pick these up. If you have a scanner, check for any pending or stored codes, even if the check engine light isn't on.

  2. Common Causes for Volvo Battery Drain:

    • Sensus Infotainment System: Software glitches or a module that fails to properly shut down can keep the system awake, drawing power. There have been TSBs for software updates to address various Sensus-related issues.
    • Telematics Control Module (TCM): The module responsible for Volvo On Call/SOS services can sometimes malfunction and stay active.
    • Keyless Entry/Passive Entry Modules: Faulty sensors or modules in the keyless entry system can prevent the car from fully 'sleeping.'
    • Central Electronic Module (CEM) or Rear Electronic Module (REM): These central control units can sometimes develop internal faults.
    • Aftermarket Accessories: If you have any aftermarket dash cams, remote starters, or other electronics, ensure they are properly installed and not drawing constant power.

  3. When to See a Shop:

    • If you've confirmed a parasitic draw but can't isolate the circuit, or if the draw is intermittent.
    • If your battery tests good but continues to die, indicating a deeper electrical issue.
    • If you suspect a software-related issue with the Sensus system or other control modules. A Volvo dealership has specialized diagnostic tools (VIDA) to read all module fault codes, perform software updates, and accurately diagnose complex electrical problems. Mention any specific TSBs you've heard about to the service advisor.
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