Service bulletins for the 2023 Toyota Corolla
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
141 on file from NHTSA, as of 2026-10-19.
About U0100 on the 2023 Toyota Corolla: what the code means, and the bulletins and recalls about the same components.
By type
By component
By trouble code
Only bulletins with trouble code: U0100 are shown. Show all
| 23TC02a | 2023-08-28. Service bulletin. SERVICE BRAKES, ELECTRIC:SOFTWARE/PROGRAMMING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM). RL: Due to certain programming in the brake ECU, under certain conditions, DTC U0100 is stored and cannot be cleared even though a technician attempts to do so. This condition does not affect the vehicle operation. |
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| 23TC02 | 2023-08-28. Service bulletin. ELECTRICAL SYSTEM:CYBERSECURITY; SERVICE BRAKES. DP: Due to certain programming in the brake ECU, under certain conditions, DTC U0100 is stored and cannot be cleared even though a technician attempts to do so. This condition does not affect the vehicle operation. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.