B1620 on Kia: How to Diagnose & Fix
Airbag System Control Module (SRSCM) Internal Fault
1 Kia model · 1 documented issue · 1 critical
B1620 on Kia by model: symptoms, diagnosis and fix
Two separate Kia safety recalls cover different model years. Under 18V363000 (SC165), the airbag control unit in certain 2010-2013 Forte vehicles can suffer electrical overstress during a frontal crash, preventing the frontal airbags and seatbelt pretensioners from deploying. Under 22V031000 (SC226), the ACU cover in certain 2017-2018 Forte vehicles can contact a memory chip, illuminate the airbag warning light with DTC B1620 and deactivate the airbags.
Common Symptoms
- Airbag warning light remains illuminated
- DTC B1620 stored (2017-2018 Forte)
- Airbags or pretensioners may not deploy in a crash
How to Fix
Check the VIN for both recalls. For 18V363000, Kia installs an extension wire-harness kit between the ACU and vehicle harness. For 22V031000, Kia updates ACU software when B1620 is absent and replaces the ACU when B1620 is present. Both remedies are free and VIN-specific. If the airbag warning light stays on, follow Kia’s recall instructions and arrange dealer diagnosis.
Sources for this issue (4)
B1620 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 B1620 mean on a Kia?
B1620 stands for "Airbag System Control Module (SRSCM) Internal Fault." The Airbag Control Unit runs a self-diagnostic routine for roughly six seconds after the ignition is turned on. B1620 sets when that self-test reports an internal failure of the module itself. Hyundai has issued two separate remedies over time: Service Campaign TX8 reprograms the ACU because sufficient vibration during the diagnostic window (for example a door being slammed) could cause the module to erroneously detect an internal fault; Warranty Extension TXXQ / TSB 24-BE-014H lists B1620 as a genuine internal-failure code requiring ACU replacement on Accent (HC). On Kia it is documented across 1 model: Forte.
What are the most common causes of B1620?
The most common causes of B1620 are: Genuine internal electronic failure of the ACU/SRSCM (remedy: ACU replacement per Warranty Extension TXXQ), Outdated B1620 diagnostic logic — vibration such as a slammed door during the post-ignition self-test falsely sets the code (remedy: ACU reprogramming per Service Campaign TX8), Water intrusion at the module location shorting the board, Low or unstable supply voltage to the ACU during the self-test. The specific cause varies by vehicle.
How much does it cost to fix B1620 on a Kia?
Repair costs vary widely with the root cause and Kia model; each issue on this page carries its own estimate where one is published.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.