# Service bulletin 23TC02a

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.

- Type: Service bulletin
- NHTSA id: 10241413
- Published by NHTSA: 2023\-08\-28
- Manufacturer's number: 23TC02a
- Manufacturer's date: 2023\-07\-27
- NHTSA component: SERVICE BRAKES, ELECTRIC:SOFTWARE/PROGRAMMING; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\)

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10241413-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10241413-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Brakes, Engine, Engine control module

## Trouble codes named

U0100

## Vehicles listed

- 2023 TOYOTA COROLLA

## Other bulletins for the same vehicles and component

- [T\-SB\-0107\-20](/bulletins/10241404.md), 2023-08-28, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE \(ECU/ECM\):SOFTWARE. TSB: Flash reprogramming allows the Electronic Control Unit \(ECU\) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are released as field\-fix procedures described in individual Service Bulletins. This bulletin details the Global Techstream\+ \(GTS\+\) ECU flash reprogramming procedures and outlines use of the Technical Information System \(TIS\) and the Calibration Update Wizard\+ \(CUW\+\). To ensure the correct ECU software is installed, ECUs will require a Security Signature before the ECU will initialize the flash reprogramming sequence. This bulletin also details the process for acquiring a Security Signature from TIS during the GTS\+ ECU flash reprogramming process.

JSON: [/v1/bulletins/10241413](/v1/bulletins/10241413)

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