B1325 B0xxx · Body (B) Medium severity
System Voltage Out of Range
The body module has seen voltage either too low or too high. Check the charging system in both directions before replacing anything.
Severity guidance: Medium — drivability or emissions affected, book it in this week
Symptoms you will notice
- Random warning lamps
- Modules dropping off the bus
- Dimming or flickering lights
Common causes
Ordered from most to least likely — start at the top.
- 1 Charging system fault (under- or over-charging)
- 2 Loose battery terminal
- 3 Faulty earth
- 4 Jump-start voltage spike
How to diagnose it
Cheapest and least invasive first — most of these codes are not a parts problem.
- ✓ Measure charging voltage at idle and at 2,000 rpm with loads on.
- ✓ Check battery terminals for tightness and corrosion.
- ✓ Look at the vehicle history for recent jump starts.
- ✓ Read the same fault across other modules to see how widespread it is.
Repair options
- Repair the charging system
- Clean and tighten terminals
- Replace a damaged battery
B1325 — frequently asked questions
Multiple modules have the same code — what does that mean? +
A vehicle-wide supply problem, not a module fault. Start at the battery and alternator.
Can jump-starting damage modules? +
Yes if polarity is reversed or voltage spikes. Always connect a stable supply when boosting modern vehicles.
Confirm the diagnosis before you buy parts
Send us the code, freeze-frame data and the vehicle — our engineers will tell you what to test first.