B15A8 on Lexus: How to Diagnose & Fix
Telematics Transceiver Malfunction
1 Lexus model · 1 documented issue
B15A8 on Lexus by model: symptoms, diagnosis and fix
B15A8 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 B15A8 mean on a Lexus?
B15A8 stands for "Telematics Transceiver Malfunction." Set by the Data Communication Module (DCM, the telematics transceiver) when its power-on self-check finds an internal error in the EEPROM (which stores the data needed to operate the Safety Connect system) or in the PLL IC (which oscillates the cellular radio frequency). It is an internal-module fault, not a wiring-continuity fault, though a poor connection at the DCM connector can also set it. Toyota has documented that this DTC can be stored during manufacturing and shipping without indicating any real vehicle defect. On Lexus it is documented across 1 model: UX.
What are the most common causes of B15A8?
The most common causes of B15A8 are: Internal EEPROM or PLL IC failure inside the DCM / telematics transceiver, Poor electrical connection or corrosion at the DCM connector, DCM firmware fault (including the DCM firmware that keeps the module awake and drains the 12V battery), Code stored during vehicle manufacture or shipping with no actual fault present. The specific cause varies by vehicle.
How much does it cost to fix B15A8 on a Lexus?
Repair costs vary widely with the root cause and Lexus model; each issue on this page carries its own estimate where one is published.
Looking for B15A8 on a different make?
View B15A8 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.