Fault Code B0845
Code meaning, symptoms, possible causes, part number, and estimated cost.
B0845
Battery Back-up Power Supply Circuit
This code indicates a malfunction in the battery back-up power supply circuit. This circuit is responsible for retaining memory for certain systems even when the main battery is disconnected or weak, and a fault can cause settings to reset or lead to malfunctions in these systems.
Part Details
Part Name
Backup Power Supply Circuit
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪350 - ₪900
Engine Location
Body Control Module (BCM)/Battery
Symptoms
- Radio/clock settings reset
- Error messages in systems
- Starting difficulties (due to memory loss)
- Unexpected electrical behavior
Possible Causes
- 1Faulty backup battery (if applicable)
- 2Broken/shorted wiring
- 3Power control unit issue
- 4Blown fuse in the circuit
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