# Service bulletin 23TC02

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: 10241381
- Published by NHTSA: 2023\-08\-28
- Manufacturer's number: 23TC02
- Manufacturer's date: 2023\-07\-27
- NHTSA component: SERVICE BRAKES, ELECTRIC

## NHTSA's summary

TI: TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 23TC02 BRAKE ECU REPROGRAM CERTAIN 2023 MODEL YEAR COROLLA HV

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2023/MC-10241381-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2023/MC-10241381-9999.pdf)

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

## Components

Brakes

## Vehicles listed

- 2023 TOYOTA COROLLA

## Recalls for the same vehicles and component

- [2024547](/recalls/tc/2024547.md), 2024-09-20: Brakes
- [24V708000](/recalls/nhtsa/24V708000.md), 2024-09-20: SERVICE BRAKES, HYDRAULIC:POWER ASSIST:ELECTRIC:SOLENOID/ACTUATOR; SERVICE BRAKES, ELECTRIC:SOFTWARE/PROGRAMMING

## Other bulletins for the same vehicles and component

- [24TC01](/bulletins/11005140.md), 2024-07-23, Service campaign: ELECTRICAL SYSTEM; SERVICE BRAKES. TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 24TC01 BRAKE ACTUATOR ASSEMBLY \(SKID CONTROL ECU SOFTWARE UPDATE CERTAIN 2023 MODEL COROLLA
- [24TC01](/bulletins/11005138.md), 2024-07-23, Service campaign: ELECTRICAL SYSTEM; SERVICE BRAKES. The subject vehicles are equipped with a straight\-type shift lever, including a Brake \(B\) shift position. If the driver shifts rapidly from Park/Reverse/Neutral directly to the B position and starts driving, the Brake Electronic Control Unit \(ECU\) may continue to recognize the previous shift position and not the B shift position.
- [TSB010421](/bulletins/10252251.md), 2024-04-01, Service bulletin: SERVICE BRAKES, HYDRAULIC; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:COOLING SYSTEM; LANE DEPARTURE. TSB: Some 2018 ? 2024 model year Toyota vehicles equipped with an A25A\-FKS, A25A\-FXS, M20A\-FKS, or M20A\-FXS engine may exhibit one or more of the following conditions: ?Milky/discolored engine oil. ?An ?Oil Pressure Low? warning message on the Multi\-information Display \(MID\). ?A MIL ON condition with Diagnostic Trouble Codes \(DTCs\) P05202A \(Engine Oil Pressure Sensor/Switch ?A? Signal Stuck in Range\) and/or P052477 \(Engine Oil Pressure Too Low \[Severe\]\) present. Moisture from blow\-by gases condenses and accumulates in the engine oil during short trips in extreme cold weather. When the moisture in the oil freezes, the oil pressure may drop, and the aforementioned warning indicators may display. Follow the procedures in this bulletin to address these conditions.
- [23TC02a](/bulletins/10241413.md), 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.
- [23TC02](/bulletins/10241412.md), 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.

JSON: [/v1/bulletins/10241381](/v1/bulletins/10241381)

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