C1247Brake pedal stroke sensor fault

• Toyota/Lexus code · ABS / stability control
• Lights a warning lamp

How the car detects it

On hybrids with electronically controlled brakes, a sensor measures how far the brake pedal moves. The skid control unit considers its signal faulty. On 2004-2009 Prius Toyota found the monitoring logic too sensitive and released an updated skid control unit. Braking still works, but the brake assist may be reduced and the pedal can feel different. If the red brake warning light is on, have the car checked before driving further.

What you may notice

• Check-engine, brake, ABS and VSC warning lights

Likely causes

• PossibleOver-sensitive monitoring logic (updated unit available)
• PossibleStroke sensor or its wiring

Sources

• static.nhtsa.gov › MC-10132768-9999.pdf · official document

Backed by an official manufacturer document.

From Obdaryn's Toyota/Lexus pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.