Mercedes EQC Battery “HALVED”? Dealer Quoted £56,000 — Our Fix Will Shock You!

Video Description

A Mercedes EQC 400 rolls in with a high-voltage warning and range slashed. The dealer estimate? ~£56,000. We drop the pack, chase fuses, fight silicone seals, interrogate both BMS units… and then the trail points somewhere no one expects. 👀 In this episode: Dual-pack EQC battery architecture, cell balance & SoC mismatch Underbody/battery inspection, pre-charge/pyro checks, and dead ends The turning point: following the data to the real cause Programming session, reset procedure, and the long road test Clear, honest costs — and why jumping straight to parts can burn money We’re OGS Mechanics – Hybrid & EV (London). Real diagnostics. Safe HV work. Component-level thinking. 📍 Visit Us: OGS Mechanics Units 9–14, Millers Yard Rear of 28 Long Lane London N3 2QG 📞 07918 061897 📺 Watch Our Repairs in Action: 📌 Subscribe on YouTube → Weekly EV/Hybrid breakdowns, fixes & full diagnostics 📲 Follow the Behind-the-Scenes Garage Life: 🎵 TikTok: https://www.tiktok.com/@ogsmechanics 📸 Instagram: https://www.instagram.com/ogs_mechanics 📘 Facebook: https://www.facebook.com/share/15J54KFwjE/?mibextid=wwXIfr 🔔 Subscribe for weekly EV/Hybrid repairs with transparent costs. Timestamps 0:00 EQC arrives — HV warning & low range (dealer quote ~£56k) 1:20 Scan: BMS errors, Pack A vs Pack B SoC mismatch 2:55 Underbody check & plan to drop the battery 4:40 Battery out: cooling, dual-BMS layout overview 6:20 Front cover access — fuse/pyro checks (no smoking gun) 8:05 Rear cover battle — more checks, still inconclusive 10:30 Rethink: follow the data, change strategy 11:40 Dealer tool connected — critical reset/procedure path 13:45 Programming session (both BMS) 15:20 Reboot & verification — warnings gone, range back 16:15 Road test — balance/temps stable 17:30 Costs & lessons — avoid the £56k trap #MercedesEQC #EVRepair #HighVoltageBattery #BMS #SoftwareUpdate #ElectricCars #CarRepair #OGSMechanics #WorkshopLife #Diagnostics Music from #InAudio: https://inaudio.org/ Track Name.Sport Rock Energetic by Infraction [No Copyright Music] / Running Faster Music from #InAudio: https://inaudio.org/ Track Name.Sport Trap Rock Workout by Infraction [No Copyright Music] / Are You Ready