B1102 on 2021-2023 Kia Rio — Airbag/Restraint System Battery Voltage Low
1 vehicles · 1 makes · $120-$900 repair
How to diagnose and fix B1102: most-reported vehicles
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Kia Rio · 2021–2023
Some Rio owners have experienced repeated dead batteries after the car sits overnight or for several days, despite the battery testing good initially. Reports point to parasitic draw from modules that do not consistently enter sleep mode, including infotainment, telematics, or body control functions. The result is a no-start condition, especially in colder weather or on vehicles driven short distances.
Common Symptoms
- dead battery overnight
- slow crank
- click no-start
- battery repeatedly needs jump-start
- problem worse after sitting
How to Fix
Proper diagnosis requires a parasitic draw test after all modules should be asleep, followed by fuse isolation to identify the circuit staying awake. Dealers may update software, replace a weak battery damaged by repeated discharge, or replace the offending module if draw remains excessive. Battery state of health should be verified because repeated deep discharge can permanently reduce capacity.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Duralast Platinum H5/Group 47 60Ah AGM battery H5-AGMOEMDuralast H5-AGM / AutoZone 338292
Replace a capacity-tested damaged 12V battery after the parasitic draw or charging fault is identified and corrected Fitment/availability: 2021-2023 U.S.-market Kia Rio only after confirming 60Ah AGM, H5/Group 47 dimensions, top-right po…
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Owner tips & cautions
- TipUse a low-amp clamp meter or multimeter with sleep-mode timing to verify parasitic draw before replacing the battery again.
- TipIf the car sits for long periods, owners often use a smart maintainer to prevent repeated deep discharge while the root cause is being diagnosed.
Sources for this issue (1)
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B1102 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 B1102 mean?
B1102 stands for "Airbag/Restraint System Battery Voltage Low." B1102 is a manufacturer-specific body code that, on many Asian-make vehicles (e.g., Hyundai/Kia), indicates the airbag (SRS) control module detected battery/supply voltage below the required range to operate the restraint system correctly; on some GM applications it relates to an audio output circuit instead. In the SRS context, the module cannot guarantee proper airbag operation when voltage is too low, so the airbag warning light typically comes on. Because meaning differs by maker, confirm against your vehicle's service data.
What are the most common causes of B1102?
The most common causes of B1102 are: Weak or failing battery, Faulty alternator or low charging-system output, Corroded or loose battery/ground connections, Voltage drop in the SRS module power supply circuit, Faulty airbag (SRS) control module, Parasitic drain or recent deep discharge. The specific cause varies by vehicle.
How much does it cost to fix B1102?
Repair costs for B1102 range from $120 to $900, depending on the vehicle and root cause.
Which vehicles are affected by B1102?
Au7o has documented B1102 across 1 vehicle models from 1 manufacturers: Kia.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.