Mercedes C‑Class & E‑Class 48V EQ Boost Specialist London | ISG, 48V Battery & DC‑DC Repair | FixAnyEV

⚡ Mercedes‑Benz C‑Class & E‑Class 48V EQ Boost Specialist

Mobile Diagnostics, 48V Battery Repair, ISG Faults & EQ Boost System Repair Across London

Modern Mercedes‑Benz C‑Class and E‑Class models use a 48‑volt “EQ Boost” mild‑hybrid system to deliver smoother acceleration, improved efficiency and seamless start‑stop performance. This system integrates:

  • ISG (Integrated Starter‑Generator)
  • 48V lithium battery pack
  • 48V DC‑DC converter
  • Power electronics module
  • Regenerative braking
  • Torque‑fill and boost functions

When a fault occurs, the vehicle may lose torque assist, disable start‑stop, show hybrid warnings, or enter limp mode.

FixAnyEV provides full mobile diagnostics and repair for all Mercedes 48V EQ Boost systems across London.

📞 Call 07779 836 677 for Mercedes EQ Boost diagnostics.

🔧 What the Mercedes EQ Boost System Does

✔ Integrated Starter‑Generator (ISG)

  • Provides torque boost
  • Enables smooth engine restart
  • Supports regenerative braking
  • Assists low‑speed driving

✔ 48V Battery Pack

  • Stores recovered energy
  • Powers the ISG
  • Supports electrical loads
  • Manages charge/discharge cycles

✔ 48V DC‑DC Converter

  • Converts 48V → 12V
  • Stabilises voltage
  • Supports all vehicle electronics
  • Prevents 12V battery drain

✔ Power Electronics Module

  • Controls ISG operation
  • Manages torque blending
  • Monitors system safety
  • Coordinates start‑stop

🚨 Symptoms of Mercedes EQ Boost Faults

  • “48V System Fault”
  • “EQ Boost Not Available”
  • Start‑stop disabled
  • Loss of torque assist
  • Reduced power mode
  • Harsh or delayed engine restarts
  • Battery not charging
  • DC‑DC converter warning
  • Regenerative braking not working
  • Multiple electrical faults triggered at once

🧠 Common Causes of EQ Boost System Failure

  • 48V battery degradation
  • ISG (starter‑generator) failure
  • DC‑DC converter malfunction
  • Power electronics module failure
  • Wiring or grounding issues
  • Overheating of 48V components
  • Low 12V battery affecting hybrid operation
  • Water ingress in battery or converter housing
  • Software corruption

🛠️ Mercedes EQ Boost Fault Codes (Common)

48V Battery / Energy Storage

  • P0A7F – Hybrid battery deterioration
  • P0A80 – Replace hybrid battery pack
  • P0A9C – Battery temperature sensor fault
  • P0A1F – Battery control module fault

ISG (Integrated Starter‑Generator)

  • P0C73 – ISG performance fault
  • P0C78 – Torque sensor fault
  • P0C7A – ISG overheating
  • P0C7F – Position sensor fault

48V DC‑DC Converter

  • P0A94 – DC‑DC converter performance
  • P0A1D – DC‑DC converter control module fault
  • P0A1E – DC‑DC converter overheating

Power Electronics / Hybrid Control

  • P1C73 – Hybrid system voltage fault
  • P1C7A – Hybrid system communication fault
  • P0AA6 – HV isolation fault
  • P0A0F – Engine failed to start (hybrid‑related)

Regenerative Braking

  • C1259 – HV system regen fault
  • C1310 – Hybrid control system malfunction

🛠️ Our Mercedes EQ Boost Diagnostic & Repair Process

  1. Full EQ Boost system scan – ISG, 48V battery, DC‑DC, power electronics
  2. Live data analysis – torque assist, regen, voltage, current
  3. 48V battery health test
  4. DC‑DC converter load testing
  5. ISG performance test
  6. Software & calibration check
  7. Final hybrid system validation

🔧 Mercedes EQ Boost Services We Provide

  • 48V EQ Boost diagnostics
  • 48V battery testing & replacement
  • ISG (starter‑generator) repair
  • DC‑DC converter repair
  • Power electronics module repair
  • Hybrid control module coding
  • Regenerative braking repair
  • Wiring & grounding fault tracing
  • Software updates & calibration
  • Start‑stop system repair

🚙 Models Covered

Mercedes‑Benz C‑Class (48V EQ Boost)

  • C200
  • C300
  • C43 (48V variant)
  • All 48V petrol models

Mercedes‑Benz E‑Class (48V EQ Boost)

  • E200
  • E300
  • E350
  • E53 (48V variant)
  • All 48V petrol models

🌍 Areas We Cover

All London boroughs, including:

  • Croydon, Bromley, Lewisham
  • Camden, Islington, Hackney
  • Ealing, Brent, Hillingdon
  • Kingston, Richmond, Sutton
  • Central, North, South, East and West London

📞 Book your Mercedes EQ Boost repair: 07779 836 677

⭐ Why Mercedes Owners Choose FixAnyEV

  • Mercedes 48V EQ Boost specialist
  • High‑voltage certified technician
  • Mobile service across London
  • Advanced diagnostic tools
  • Trusted by fleets, traders & private owners

📞 Book Your Mercedes EQ Boost Diagnostics

FixAnyEV brings expert Mercedes 48V hybrid diagnostics directly to your home or workplace.

📞 Call 07779 836 677 to book your EQ Boost repair.