B1A13 on Jeep
Battery Voltage Low (Body Module)
B1A13 on Jeep vehicles indicates battery voltage low (body module). Au7o has documented this code across 1 Jeep model — most commonly on Grand Wagoneer. 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.
Common Causes of B1A13
- •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
B1A13 on Jeep by Model
Jeep Grand Wagoneer(1 issue)
- Uconnect 12-Inch Touchscreen Freezing and Black Screen2022-2025
The Grand Wagoneer's 12-inch Uconnect 5 infotainment system experiences frequent freezing, black screens, and spontaneous reboots. The system may become completely unresponsive, disabling climate controls, navigation, backup camera, and vehicle settings that are exclusively managed through the touchscreen. Stellantis has released multiple over-the-air (OTA) software updates to address stability, but the issue persists for many owners. The McIntosh audio system amplifier can also contribute to system instability.
Looking for B1A13 on a different make?
View B1A13 across all makes →Frequently Asked Questions
What does B1A13 mean on Jeep?▼
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. On Jeep specifically, this code is documented across 1 model.
What causes B1A13 on Jeep vehicles?▼
Common causes on Jeep: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B1A13 on a Jeep?▼
Repair costs vary widely depending on the root cause and specific Jeep model.
Which Jeep models have B1A13 documented?▼
Au7o has documented B1A13 on 1 Jeep model: Grand Wagoneer.