B1A13: How to Diagnose & Fix — Battery Voltage Low (Body Module)
2 vehicles · 2 makes · $100-$1,500 repair
How to diagnose and fix B1A13: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Dodge Magnum · 2005–2008
The Dodge Magnum suffers from widespread electrical problems centered around the TIPM (Totally Integrated Power Module) and the steering column control module (clockspring). Symptoms include dash lights flickering or going completely dark while driving, headlights cutting out at night, loss of turn signals, wipers, horn, and cruise control all at once. The steering column module failure is particularly dangerous as it can disable multiple safety systems simultaneously. The TIPM relay failures can cause no-start conditions, fuel pump cutouts, and random electrical gremlins throughout the vehicle.
Common Symptoms
- Dashboard lights flickering or going completely dark while driving
- Headlights cutting out intermittently, especially at night
- Loss of turn signals, wipers, horn, and cruise control simultaneously
- Vehicle cranks but will not start intermittently
- Fuel pump stops running randomly while driving
- Warning lights illuminating on dash without clear cause
How to Fix
For steering column module failure (loss of wipers, horn, turn signals, cruise control simultaneously), replace the clockspring assembly ($150-$300 part, $200-$400 labor). For TIPM-related issues, have the relays tested — individual relay replacement is sometimes possible ($50-$150), but full TIPM replacement runs $400-$800 for the module plus programming. For flickering dash lights, check the instrument cluster ground connections and the body harness ground behind the left kick panel.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Mopar 56049795AE clockspring / steering-column control module
Replace when steering-wheel functions and clockspring/module testing isolate this assembly Fitment: Product fitment includes Magnum configurations; verify VIN/options and airbag procedure Live OEM direct-product page when checked
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
Jeep Grand Wagoneer · 2022–2025
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.
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)
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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?
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.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.