01 – Fault Overview
MVBM Crash-Detected Fault on 48V Mild Hybrids
On Volvo mild-hybrid vehicles equipped with a 48V battery, model year 2020 and newer, even a minor collision can prevent the engine from starting.
Why the Engine Does Not Start
For safety reasons, the main relay inside the MVBM 48V battery can be disconnected after a crash event. When this happens, the vehicle may store MVBM crash-detected DTCs and the engine may no longer start.
Volvo commonly recommends replacing the MVBM battery after this condition, but in supported cases VDASH can unlock the battery through OBD and allow the engine to start again.
02 – Related DTCs
Crash-Detected MVBM Codes
The following DTCs may be related to this condition:
- MVBM-B16527F – Crash detected. Mechanical Failures. Actuator Stuck Off
- MVBM-B1652 – Crash detected. Mechanical Failures. Actuator Stuck Off
- MVBM-B1652-7F
- B16527F
- B1652-7F
- B1652
03 – VDASH Solution
Unlock the MVBM Battery via OBD
With VDASH, it is possible to unlock the MVBM 48V battery through the OBD connection and start the engine again, when the vehicle and battery are safe and supported.
VDASH can also be used to force charging and start battery SOC calibration.
Supported Connection Options
You can connect to the vehicle using a SUPER J2534 or VOE adapter.
04 – Supported Hardware
Supported MVBM Hardware Numbers
05 – Price Information
VDASH Repair Price
€150 VAT excl.
Reference replacement cost: Volvo may recommend replacing the MVBM battery, which is approximately €1000, plus software approximately €80 and labor approximately €100.
Prices are shown as provided and may vary by market, workshop, and vehicle condition.
Final Takeaway
MVBM-B16527F and related crash-detected DTCs can prevent a Volvo 48V mild-hybrid vehicle from starting after a minor collision because the MVBM battery relay is disconnected for safety. In supported cases, VDASH can unlock the battery through OBD, force charging, and start SOC calibration.