Hybrid & EV Insulation Resistance Fault Diagnosis – Codes 222814 & 22280F

High-Voltage Insulation Resistance Fault in Your Hybrid or EV?

If you’re seeing fault codes 222814 or 22280F, your vehicle is detecting a leakage path or short between the high-voltage circuit and the chassis. This is a critical electrical safety issue and will often prevent the car from entering READY mode or charging properly.

📞 Call Now for Expert Mobile Diagnosis – 07421 186356
Serving London, Southeast England, and beyond.

🔌 What Is an Insulation Resistance Fault?

Insulation resistance faults occur when there’s an unexpected electrical path between a high-voltage component and the vehicle’s ground (chassis). This usually indicates:

  • 🔩 Moisture intrusion in a connector or HV cable

  • ⚡ Degraded insulation on the high-voltage wiring harness

  • 🔧 Internal fault in the inverter, DC-DC converter, or battery pack

  • 🧯 Contamination or damage in the HV junction box

Such faults can disable the hybrid/EV system, trigger safety shutdowns, or prevent charging.

🚨 Understanding Fault Codes:

🔹 222814 – Insulation Resistance Fault

This typically means the HV control unit has detected low resistance between a high-voltage line and ground. It could be permanent or intermittent.

🔹 22280F – Insulation Monitoring Error

This fault often appears during startup or precharge and means the system’s monitoring circuit cannot verify safe isolation between HV lines and the chassis.

🧰 What Our Mobile Hybrid & EV Technicians Do:

  • 🔍 Full HV system scan – including all ECUs

  • 🧪 Insulation resistance testing using specialist HV-safe multimeters

  • 💦 Leak detection – checking connectors, battery pack, and conduit routes

  • 🔧 Pinpoint failed modules or water ingress

  • 🛠️ Replace or repair affected parts – if mobile repair is possible

  • 📄 Provide a full HV safety inspection report

🏁 Vehicles We Cover:

  • ✅ Toyota: Prius, Auris, C-HR, RAV4, Yaris Hybrid

  • ✅ Lexus: RX, CT, NX, IS, UX Hybrid

  • ✅ Hyundai / Kia: Ioniq, Kona EV, Niro, Sportage PHEV

  • ✅ BMW: i3, i8, 330e, X5 xDrive45e

  • ✅ Mercedes EQ / EQ Power models

  • ✅ Nissan Leaf / e-NV200

  • ✅ Ford Kuga PHEV, Mondeo Hybrid

  • ✅ All plug-in hybrids and fully electric vehicles

📍 On-Site Diagnosis – London & South UK Coverage

We come to you for insulation resistance fault diagnosis in:

  • North, East, West, South & Central London

  • Kent, Essex, Surrey, Sussex

  • South East England & Greater London radius

  • Nationwide fleet & workshop visits available by appointment

📞 Book Insulation Resistance Testing Now

A low insulation resistance fault is not something to ignore. It can leave your hybrid or EV disabled and, in rare cases, pose a fire risk if not diagnosed properly.

📲 Call or WhatsApp 07421 186356
🌐 www.fixanycar.co.uk
🛠️ Hybrid & EV Specialists | Fully Mobile | Fast Diagnosis

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