Volvo Trucks recall: C0506 – HPCU SW update. FHE/FME/FMLE (4) (Phase 1) / C0520 IRMU replace. FHE/FME (4) (Phase 2) / C0521 IRMU replace FHE/FME/FMLE (4) / FLE/FEE (3) (Phase 3)
- What's wrong
- On affected vehicles the AC inlet socket and the power outlet for body builder equipment might be incorrectly energized. Therefore in vehicles where AC or DC power outlets are installed there might be voltage with low leakage current inadvertently present inside the AC inlet socket…
- What to do
- Contact a Volvo Trucks dealer to book the free repair. The insulation monitoring device (IMD) will be replaced by an upgraded version a residual current device (RCPF sensor) will be installed inside the insulation resistance measurement unit and the OCEPS…
What’s wrong
On affected vehicles the AC inlet socket and the power outlet for body builder equipment might be incorrectly energized. Therefore in vehicles where AC or DC power outlets are installed there might be voltage with low leakage current inadvertently present inside the AC inlet socket when the power outlet is active. Also when AC charging there might be a voltage with low leakage current inadvertently present on the power outlet.
The fix
The insulation monitoring device (IMD) will be replaced by an upgraded version a residual current device (RCPF sensor) will be installed inside the insulation resistance measurement unit and the OCEPS software will be updated. For vehicles built after 2025w21 until 2025w37 will also have the EMC filter reinstalled.
Vehicles affected
| Model | Built from | Built to | Vehicles |
|---|---|---|---|
| FHE | 19 May 2025 | 18 Aug 2025 | – |
| FME | 4 Dec 2023 | 25 Aug 2025 | 3 |
| FLE | 15 Jan 2024 | 22 Oct 2024 | 2 |
| FEE | 1 Oct 2024 | 1 Oct 2024 | 1 |
How to check your vehicle
Use the official DVSA checker with your registration number to see if your exact vehicle is included. If it is, the manufacturer should have written to the registered keeper. The repair is free, even if you bought the vehicle second-hand.
Updated 25 November 2025. This page summarises an official notice. Details can change – always follow the official notice.