B1A13 on Jeep: How to Diagnose & Fix
Battery Voltage Low (Body Module)
1 Jeep model · 1 documented issue
B1A13 on Jeep by model: symptoms, diagnosis and fix
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.
Common Symptoms
- Touchscreen completely frozen or unresponsive
- Screen goes black while driving
- System reboots spontaneously (showing Jeep logo)
- Climate controls unresponsive (managed through screen)
- Backup camera fails to display
- Bluetooth audio stuttering or disconnecting
How to Fix
First, perform a soft reset: press and hold the Uconnect power/volume knob for 10-20 seconds until the screen goes black and reboots. If the issue persists, visit the dealer for the latest Uconnect 5 software update (check for TSB 08-135-22 REV. C or later). Ensure the 12V battery is in good condition — low voltage causes Uconnect instability. Some owners have required a full head unit replacement under warranty. Disable unnecessary background apps and features like SiriusXM 360L if stability issues continue.
Owner tips & cautions
- TipBefore going to the dealer, try a hard reset: disconnect the negative battery terminal for 30 minutes, then reconnect. This fully resets the Uconnect 5 system and clears corrupted cache data. About 50% of screen freeze issues are resolved by this simple reset.
Sources for this issue (2)
B1A13 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does B1A13 mean on a 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 it is documented across 1 model: Grand Wagoneer.
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 on a Jeep?
Repair costs vary widely with the root cause and Jeep model; each issue on this page carries its own estimate where one is published.
Looking for B1A13 on a different make?
View B1A13 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.