B1A13: Battery Voltage Low (Body Module)
2 vehicles · 2 makes · $100-$1,500 repair
Most Reported On
B1A13 is an OBD-II diagnostic trouble code meaning “Battery Voltage Low (Body Module).” This is a body-network code indicating that a body control module has detected battery (system) voltage that is too low for reliable operation. Body modules need a stable voltage to run features like lighting, locks, and other electrical accessories, so when the supply drops below a set threshold the module logs this fault. It usually points to a charging or battery problem rather than a fault in the module itself, and it may appear alongside other low-voltage codes from multiple modules. Common triggers include a weak battery, a charging system fault, or poor electrical connections. This code is most commonly reported on 2005-2008 Dodge Magnum, and 2022-2025 Jeep Grand Wagoneer, with repair costs ranging from $100 to $1,500.
Common Causes
Typical Repair Cost
Based on 2 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose B1A13, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does B1A13 mean?
B1A13 stands for "Battery Voltage Low (Body Module)." This is a body-network code indicating that a body control module has detected battery (system) voltage that is too low for reliable operation. Body modules need a stable voltage to run features like lighting, locks, and other electrical accessories, so when the supply drops below a set threshold the module logs this fault. It usually points to a charging or battery problem rather than a fault in the module itself, and it may appear alongside other low-voltage codes from multiple modules. Common triggers include a weak battery, a charging system fault, or poor electrical connections.
What are the most common causes of B1A13?
The most common causes of B1A13 are: Weak, aged, or failing battery, Faulty alternator or charging system, Loose or corroded battery terminals or ground connections, Excessive parasitic battery drain, Damaged or high-resistance power supply wiring to the module, Worn or loose serpentine/accessory belt slipping the alternator, Faulty body control module power input circuit. The specific cause varies by vehicle.
How much does it cost to fix B1A13?
Repair costs for B1A13 range from $100 to $1,500, depending on the vehicle and root cause.
Which vehicles are affected by B1A13?
Au7o has documented B1A13 across 2 vehicle models from 2 manufacturers: Dodge, Jeep.
Sources (4)
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.