⚡ EV Battery TMS, Coolant Pump & HV Heater Fault Repair in London

Mobile Diagnostics for EV Battery Thermal Management Faults

Your EV’s Battery Thermal Management System (TMS) controls battery temperature during driving, charging and rapid charging. If the TMS, coolant pumps or HV heater fail, the EV may refuse to charge, enter reduced‑power mode, overheat, or shut down to protect the battery.

FixAnyEV provides advanced mobile diagnostics for all TMS, pump and heater faults anywhere in London.

📞 Call 07779 836 677 for immediate assistance.

⚠️ TMS faults can cause rapid battery degradation. ⚠️ Never rapid‑charge an EV with cooling or heater faults. ⚠️ HV heaters and pumps are high‑voltage components — do not attempt DIY repairs.

🔍 Common Battery TMS Faults We Repair

🔥 Battery Over‑Temperature

• Cooling pump failure
• Blocked coolant channels
• Valve stuck open/closed
• Chiller failure
• Fan or radiator issues

❄️ Battery Under‑Temperature

• HV heater failure
• PTC heater fault
• Coolant flow too low
• Temperature sensor errors

💧 Coolant Pump Failure

• Pump not running
• Low flow rate
• Pump electrical failure
• Airlock in cooling loop

🔄 Coolant Valve / Diverter Fault

• Valve stuck
• Incorrect flow direction
• No cooling during DC rapid charging

🌡️ Temperature Sensor Fault

• Incorrect battery temperature readings
• Charging refusal
• Reduced‑power mode

⚡ HV Heater / PTC Heater Failure

• Battery won’t warm up
• Slow charging in cold weather
• “Battery Heating Fault”
• No cabin heat on some EVs

🧊 Chiller / Refrigerant System Fault

• Battery overheats during rapid charging
• AC system linked to battery cooling
• Compressor or expansion valve issues

📞 Call 07779 836 677 if your EV shows any of these symptoms.

🚗 Symptoms of TMS, Pump or Heater Failure

• “Battery Temperature Too High/Low”
• “Battery Cooling Fault”
• “Battery Heating Fault”
• EV won’t rapid charge
• Charging stops immediately
• Reduced‑power mode
• Loud pump noise
• No coolant flow
• Cabin heat not working (shared loop)

⚠️ TMS faults can permanently damage the HV battery if ignored.

🛠️ Our Diagnostic Process

1. Full EV‑specific scan – TMS, BMS, pumps, valves, heater, chiller
2. Live coolant flow testing
3. Pump activation tests
4. HV heater resistance & activation checks
5. Temperature sensor verification
6. Cooling loop pressure & flow analysis
7. On‑site repair or safe workaround

⚠️ Battery cooling loops are HV‑linked — specialist access required.

🔒 Locked & Security‑Protected on Most EVs

Battery TMS, pumps and HV heaters are controlled by:

• BMS
• Gateway module
• HVJB
• Secure HV activation logic

These systems are security‑protected and cannot be accessed with standard garage tools.

FixAnyEV uses EV‑specific diagnostic equipment to safely access:

• Pump control logic
• Heater activation
• TMS temperature mapping
• Cooling loop commands
• HV safety interlocks

📞 Call 07779 836 677 for secure HV diagnostics.

🌍 Areas We Cover in London

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

⭐ Why EV Owners Choose FixAnyEV

• High‑voltage certified technician
• EV‑specific TMS diagnostics
• Mobile service across London
• Faster and more accurate than dealerships
• Trusted by EV owners, traders, fleets and dealers

📞 Book now: 07779 836 677

📞 Book Your Battery TMS, Pump or Heater Repair

If your EV shows battery temperature, cooling or heating warnings, FixAnyEV brings expert diagnostics and repair directly to you.

⚠️ Stop rapid charging immediately if TMS faults appear.

📞 Call 07779 836 677 to book your mobile EV repair.