Common TPMS Warning Light Causes on BYD (2025+)
The TPMS system on newer BYD vehicles uses direct sensors inside each tire that broadcast pressure and temperature data via 433MHz RF signals. When the warning light stays on or flashes, one of these three things is happening:
1. Dead Sensor Battery (Most Common)
Each TPMS sensor has a sealed lithium battery rated for 5–7 years. On a 2025+ BYD, if the car is 5+ years old or has high mileage, battery failure is the prime suspect. Symptoms:
- Warning light stays solid after driving 10+ minutes.
- The infotainment screen shows “—” or “0 psi” for one tire.
- You’ve already checked and filled all tires to spec.
Replacement rule: You cannot replace just the battery—the entire sensor unit must be swapped. The BL-ST-096 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits BYD (2025+) | OE# EUEA3609200B, 110964, BLST096 is a drop-in 433MHz replacement that auto-relearns, meaning no TPMS tool or dealership visit is required.
2. Actual Low Tire Pressure
Always rule this out first. Temperature drops of 10°F (6°C) can cause a 1–2 psi drop. Use a digital tire gauge, not the car’s display, to verify. If pressure is low, inflate and reset (drive above 15 mph for a few minutes). If the light returns within a week, you likely have a slow leak from a nail, valve stem, or bead seal.
3. Signal Interference or Relearn Failure
433MHz TPMS sensors are susceptible to RF interference from:
- Aftermarket LED headlights or DRLs with poorly shielded drivers.
- Dashcam power supplies or chargers plugged into the 12V socket.
- Wireless phone chargers mounted near the dashboard.
- Metalized window tint (ceramic tint is fine).
Diagnosis step: If the warning light flashes continuously (not solid), the system is failing to receive a signal from one or more sensors. Temporarily unplug any aftermarket electronics near the steering column or glovebox. If the light goes out, the interference source is identified.
Sensor Battery Failure vs. Signal Interference: Quick Diagnosis Table
| Symptom | Likely Cause | Action |
|---|---|---|
| Light stays solid, one tire shows “—“ | Dead sensor battery | Replace sensor (BL-ST-096) |
| Light flashes for 60 seconds, then stays solid | Low pressure or faulty sensor | Check pressure; if OK, suspect dead battery |
| Light flashes continuously (never stays solid) | Signal interference or relearn failure | Remove aftermarket electronics; drive 10 min at 20+ mph |
| Light comes on only during highway driving | Temperature drop causing low pressure | Inflate tires to cold pressure spec |
| Light resets after tire rotation but returns | Sensor not recognized after rotation | Auto-relearn may need a longer drive (10+ minutes) |
Recommended Part: BH-Sens BL-ST-096 433MHz TPMS Sensor
If you’ve confirmed a dead sensor on your 2025+ BYD, the BL-ST-096 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits BYD (2025+) | OE# EUEA3609200B, 110964, BLST096 is the correct OE-equivalent replacement. It matches the factory 433MHz frequency and protocol 0x022A, fits 34 BYD models, and requires no programming tool—just install it in the tire and drive above 15 mph for the auto-relearn to complete. OEM cross-references: EUEA3609200B, 110964, BLST096.
Important: Replace all four sensors at once if the car is over 5 years old. Replacing one now guarantees another will fail within 1–2 years, requiring a second trip to the tire shop.
FAQ
Can I replace just the battery in a TPMS sensor?
No. TPMS sensors are sealed units—the battery is molded into the sensor body. Attempting to open or re-battery a sensor will damage the electronics and break the seal, allowing moisture to enter. Always replace the entire sensor.
How do I reset the TPMS warning light after replacing a sensor on a BYD (2025+)?
The BH-Sens BL-ST-096 uses auto-relearn, so no reset button or tool is needed. After installation, drive the vehicle above 15 mph (25 km/h) for 5–10 minutes. The new sensor’s ID will automatically register with the car’s TPMS module. The warning light should turn off after one drive cycle.
Does window tint cause TPMS interference?
Only metallic or metalized window tint can block RF signals. Ceramic, carbon, and dyed tints do not interfere. If you have metalized tint on the rear window (where the TPMS antenna often sits), you may see intermittent signal loss. Switch to ceramic tint to avoid the issue.
What is the correct tire pressure for BYD (2025+) models?
Refer to the sticker on the driver’s side door jamb. Most BYD sedans and SUVs from 2025 run 33–36 psi cold (2.3–2.5 bar). Do not rely on the TPMS display for exact readings—use a mechanical gauge for verification.