2021 Tesla Model Y Braking and Stability Control Alerts
Some 2021 Tesla Model Y vehicles may display "braking and stability control related alerts" on the instrument cluster and touchscreen during power-on. This issue stems from a missing hydraulic control unit (HCU) wake-up wire. A simple vehicle power cycle can typically resolve these Tesla Model Y…
Some 2021 Tesla Model Y owners may encounter unexpected warnings on their vehicle's instrument cluster and touchscreen. These alerts, specifically described as "braking and stability control related alerts," can appear during the vehicle's power-on sequence. This issue is linked to a manufacturing anomaly where certain vehicles were built without a crucial hydraulic control unit (HCU) wake-up wire.
Symptoms
Owners of affected 2021 Tesla Model Y vehicles may observe the following symptoms:
- "Braking and stability control related alerts" displayed on the instrument cluster.
- "Braking and stability control related alerts" appearing on the vehicle's central touchscreen.
These alerts typically manifest during the initial power-on process of the vehicle. While concerning, these Tesla Model Y braking alerts are often temporary.
Diagnosis and Trigger Conditions
The root cause for these alerts is identified as a missing hydraulic control unit (HCU) wake-up wire. This wire is essential for the proper initialization of the vehicle's electronic stability control and braking systems. When this wire is absent, the HCU may not wake up correctly during the power-on sequence, leading to the system generating fault messages.
Repair Procedure Summary
According to manufacturer communication NHTSA ID 10235001, the good news is that these specific Tesla Model Y braking alerts can usually be corrected without a visit to a service center. The manufacturer indicates that the affected functionality, and the alerts themselves, can typically be restored by performing a vehicle power cycle. This action effectively reboots the vehicle's systems, allowing the HCU to properly initialize.
Owner Action
If you own a 2021 Tesla Model Y and experience "braking and stability control related alerts" on your instrument cluster or touchscreen, especially during vehicle startup, the first recommended step is to perform a vehicle power cycle. This simple procedure often resolves the issue by resetting the system. If the alerts persist after a power cycle, or if you have any concerns, it is advisable to contact Tesla service for further diagnosis and assistance.
Important Warnings
It is important to note that these alerts are described as occurring in rare circumstances. The primary solution provided is a vehicle power cycle. Owners should not attempt to diagnose or repair complex braking or stability control systems themselves. Always consult with a qualified service technician if the issue cannot be resolved with a power cycle or if you have any safety concerns.
Source: NHTSA ID 10235001
Frequently Asked Questions
- What causes the "braking and stability control related alerts" in my 2021 Tesla Model Y?
- These alerts are primarily caused by some 2021 Tesla Model Y vehicles being built without a hydraulic control unit (HCU) wake-up wire. This can lead to the HCU not initializing correctly during the vehicle's power-on process, triggering the "braking and stability control related alerts".
- How can I fix the Tesla Model Y braking alerts?
- The manufacturer communication (NHTSA ID 10235001) states that these Tesla Model Y braking alerts can typically be resolved by performing a vehicle power cycle. This action often restores the affected braking and stability control functionality.
- Are these alerts a serious safety concern?
- The manufacturer indicates these alerts appear in rare circumstances and can often be corrected with a vehicle power cycle. However, any warning related to braking or stability control should be addressed promptly. If the alerts persist after a power cycle, contact Tesla service immediately.
- Will Tesla notify me about this issue with my 2021 Model Y?
- This information comes from a manufacturer communication (TSB) rather than a recall notice. While it addresses a known issue, it does not specify if Tesla will directly notify all affected owners. Owners experiencing these "braking and stability control related alerts" should follow the recommended power cycle procedure or contact service.
What Tesla Model Y owners report
Counted from the records in our database across 7 model years.
- 4,325
- Owner complaints
- 43
- Recalls
- 146
- Service bulletins
- 588
- Crashes reported
- 26
- Fires reported
- 403
- Injuries reported
The 2021 model year
1,096 complaints, the 2nd most of 7 model years on file. Owners reported 90 crashes, 6 fires and 26 injuries for this year, which also has 23 recalls on file.
Power Train and Electronic Stability Control, the system this article covers, accounts for 102 of 4,325 complaints (2%), including 33 for 2021.
Complaints by model year
| 2020 | 283 | |
|---|---|---|
| 2021 | 1,096 | |
| 2022 | 874 | |
| 2023 | 1,194 | |
| 2024 | 335 | |
| 2025 | 109 | |
| 2026 | 434 |
Most-reported systems
- Forward Collision Avoidance — 1,975
- Vehicle Speed Control — 589
- Service Brakes — 576
- Electrical System — 571
- Steering — 490
Latest recalls for the 2021 model year
- 26V507000 — Exterior Lighting (Aug 2026)
- 26V283000 — Back Over Prevention (May 2026)
- 24V935000 — Tires (Dec 2024)
Recent owner reports about power train and electronic stability control
My heat pump and ac unit went out and Tesla wants me to pay $4000 for a faulty part that broke in less then 3 years
Read owner complaints →In early Nov 2025 my Tesla Model Y began intermittently showing warnings about the forward collision warning system and multiple sensors being offline. Tesla service replaced a faulty connector on Nov 3.
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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