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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.

By type

By component

By trouble code

Bulletins, newest first
TTT0737232023-10-16. Service bulletin. COMMUNICATION:MANUFACTURER TELEMATICS; UNKNOWN OR OTHER. TT: A very small percentage of customers experience operational difficulties with some telematics features which they cannot resolve on their own. These resources, in conjunction with the Repair Manual, are for dealership personnel to assist those customers with user issues, user errors, and compatibility issues with other vehicle systems and external applications encountered while operating telematics features. Toyota has developed and provided the following Telematics Diagnostic Guide to assist dealer technicians.
23TC01b2023-10-02. Service bulletin. AIR BAGS. TI: TECHNICAL INSTRUCTIONS FOR 23TC01 TOYOTA SAFETY SENSE INOPERATIVE INTERMITTENTLY
23TC01a2023-10-02. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; FORWARD COLLISION AVOIDANCE; LANE DEPARTURE. RL: The subject vehicles are equipped with Toyota Safety Sense (TSS) which consists of several driving assist features, including pre-collision braking, lane departure warning, and more. Due to the programming of the software within the forward recognition camera, there is a possibility that under certain conditions, TSS functions could become inoperative for approximately 4 seconds before rebooting and becoming operational again.
23TC012023-10-02. Service bulletin. LANE DEPARTURE; AIR BAGS. DP: The subject vehicles are equipped with Toyota Safety Sense (TSS) which consists of several driving assist features, including pre-collision braking, lane departure warning, and more. Due to inappropriate programming of the software within the forward recognition camera, there is a possibility that under certain conditions, TSS functions could become inoperative for approximately 4 seconds before rebooting and becoming operational again.
23TC01 TI - Publ2023-09-18. Service bulletin. AIR BAGS. TI: TECHNICAL INSTRUCTIONS FOR 23TC01 TOYOTA SAFETY SENSE INOPERATIVE INTERMITTENTLY
23TC01 Region Le2023-09-18. Service bulletin. LANE DEPARTURE; AIR BAGS. RL: The subject vehicles are equipped with Toyota Safety Sense (TSS) which consists of several driving assist features, including pre-collision braking, lane departure warning, and more. Due to the programming of the software within the forward recognition camera, there is a possibility that under certain conditions, TSS functions could become inoperative for approximately 4 seconds before rebooting and becoming operational again.
23TC01 Dealer Pa2023-09-18. Service bulletin. LANE DEPARTURE; AIR BAGS. DP: The subject vehicles are equipped with Toyota Safety Sense (TSS) which consists of several driving assist features, including pre-collision braking, lane departure warning, and more. Due to inappropriate programming of the software within the forward recognition camera, there is a possibility that under certain conditions, TSS functions could become inoperative for approximately 4 seconds before rebooting and becoming operational again.
23TC02a2023-08-28. 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.
23TC022023-08-28. 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.
T-SB-0107-202023-08-28. 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.
T-SB-0042-232023-08-28. Service bulletin. WHEELS. TSB: Some 2023 ? 2024 model year Toyota vehicles use hub bolts in place of studs/nuts to fasten the wheels to the vehicle. If non-compatible wheels or hub bolts/nuts are installed, there is increased risk that the wheel(s) could come off resulting in a crash. This service bulletin outlines the physical differences and precautions that should be taken when servicing different wheel and wheel fastener types.
23TC022023-08-28. Service bulletin. SERVICE BRAKES, ELECTRIC. TI: TECHNICAL INSTRUCTIONS FOR SPECIAL SERVICE CAMPAIGN 23TC02 BRAKE ECU REPROGRAM CERTAIN 2023 MODEL YEAR COROLLA HV
T-TT-0734-232023-06-26. Service bulletin. EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. TT: When setting up the Toyota Audio Multimedia (21MM) user profile, if the QR code is not working please use the following recommendations.
23TD01 Corolla L2023-05-15. Service bulletin. STRUCTURE:BODY:BUMPERS:ACTIVE SHUTTERS/GRILL; UNKNOWN OR OTHER. DP: The front license plate bracket provided with the vehicle has clips that potentially interfere with the lower grille assembly. This interference can make it more difficult to install the front license plate bracket.
T-TT-0731-232023-05-15. Service bulletin. ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC); SUSPENSION. TT: Some customers may complain of the suspension feeling stiff while driving or going over bumps. Some dealerships may have forgotten to remove the transportation spacer during the PDS process which can result in a stiffer than normal suspension feel.
T-TT-0699-22 Rev2023-04-17. Service bulletin. ENGINE AND ENGINE COOLING:ENGINE:HARD PARTS INTERNAL/MECHANICAL. TT: Some Model Year 2018-2023 vehicles equipped with A25A-FKS/FXS or M20A-FKS/FXS engines may display the following message ?Engine Maintenance Required Visit Your Dealer? on the combination meter
T-SB-0120-20 Rev2023-04-17. Service bulletin. STEERING. TSB: Some 2021 ? 2023 model year Toyota vehicles may require the download and installation of vehicle specific software or configuration software when the Electronic Control Unit (ECU) is replaced. Techstream software has been modified to indicate when configuration software is required. A new Configure column has been added to the Techstream Health Check Results screen to show when configuration software is available for a specific ECU. Follow the Operation Procedure in this bulletin to complete the ECU Software Configure Process.
T-SB-0012-232023-04-17. Service bulletin. BACK OVER PREVENTION; EXTERIOR LIGHTING. TSB: Some 2023 model year bZ4X vehicles with multimedia version 1505 or older; Corolla, Corolla Hybrid, and Corolla Hatchback vehicles with multimedia version 1506 or older; and Crown vehicles with multimedia version 1511 or older may exhibit one or more of the following conditions: ?Head unit rebooting. ?User Profile enhancements. ??Software Update Complete? pop-up message. ?Display screen frozen/non-responsive. ?Navigation items show on non-navigation multimedia system (Mexico market only). ?Newly added phone contact name will not show on display screen. ?Noise during hands-free calls. ?GPS location indicator stays on after map is off. ?Map does not display. ?Route guidance guides to incorrect side. ?App button(s) appear pressed. ?Sonar system display will not update on display screen. ?Back-up camera messages are in English instead of non-English. ?Incorrect HD radio icon color. ?Bluetooth profile version update. A software update is now available to address these conditions. Follow the Software Update Procedure in this bulletin to update the software.
T-TT-0678-21 Rev2023-01-17. Service bulletin. EQUIPMENT:ELECTRICAL. TT: Some 19CY LG DCM equipped vehicles may not be able to complete the firmware update due to not having an active account or waived services during the trial. Follow the steps below to enable ?Temp DCM Activation?.
T-SB-0036-22 Rev2022-12-19. Service bulletin. EQUIPMENT. TSB: Long-term or off-site storage requires special care to keep vehicles factory fresh and ready for delivery. The following guidelines should be performed to minimize vehicle component/part degradation due to extended vehicle storage conditions. Long-term storage can affect a vehicle?s systems and components. Any problems that are found should be corrected immediately.
T-SB-0029-22 Rev2022-12-19. Service bulletin. AIR BAGS; EQUIPMENT ADAPTIVE/MOBILITY. TSB: 2023 model year Toyota vehicles are equipped with driver side floor mat retainers to secure the floor mat in the correct position. In addition, some models may also utilize retainers for passenger side and rear seat floor mats. During Pre-Delivery Service (PDS), follow the appropriate Installation Procedure to attach the driver side, and if applicable, the passenger side and rear seat floor mats to the vehicle carpet using the floor mat retainers. If installation instructions are included in the floor mat kit, place the instructions in the vehicle?s glove box for customer reference
T-SB-0033-22 Rev2022-12-19. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY. TSB: Hybrid vehicles are equipped with two types of batteries: ?Hybrid vehicle (HV) battery. ?Auxiliary (12V) battery. If the hybrid vehicle is put into storage, the State-Of-Charge (SOC) of its HV battery and auxiliary battery will gradually decrease. To prevent the auxiliary battery from becoming discharged during storage, proper maintenance is necessary. As a matter of policy, Toyota does not provide battery warranty coverage for discharged and/or failed batteries due to lack of maintenance. It is the dealer?s responsibility to maintain the specified SOC of the vehicle?s battery while in stock and ensure proper SOC at delivery.
T-SB-0099-222022-12-19. Service bulletin. STRUCTURE; EQUIPMENT; ELECTRICAL SYSTEM. TSB: Pre-Delivery Service (PDS) is a critical step in satisfying our new car customers. Customer feedback indicates the following areas deserve special attention when performing PDS: ?Careful inspection for paint chips/scratches and body dents/dings. ?Proper operation of electrical accessories (including interior light, clock, and radio reset). ?Interior cleanliness. ?Proper function of mechanical systems. Customer retention and proper maintenance of vehicles are and have always been a major focus for Toyota. To help remind customers that regular service is essential to the proper maintenance of the vehicle, dealers are required to install a service reminder sticker before delivery. By doing this, customers will be reminded to return to your dealership for service. Your current service reminder sticker may be used. (See PDS Check Sheet item 8 of ?Final Inspection and Cleaning.?) This bulletin contains the PDS procedures that apply specifically to 2023 model year GR Corolla vehicles. A universal PDS Check Sheet that contains PDS steps that apply to all 2023 model year Toyota vehicles has been developed. To properly perform a complete PDS, you must complete all procedures contained in this TSB as well as the universal PDS Check Sheet. In addition, if the vehicle is stored for over 30 days, be sure to follow Long-Term Vehicle Storage Guidelines
T-SB-0031-22 Obs2022-12-19. Service bulletin. COMMUNICATION. OBSOLETE NOTICE November 28, 2022: This bulletin is now obsolete. Please see T-SB-0105-22
T-SB-0032-22 Obs2022-12-19. Service bulletin. COMMUNICATION. OBSOLETE NOTICE November 28, 2022: This bulletin is now obsolete. Please see T-SB-0104-22.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.