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Diagnose/P2909
P2909Medium SeverityHybrid/EV

Regenerative Braking System Malfunction

What This Means

The regenerative braking system that recovers energy during deceleration has malfunctioned. The vehicle will rely more on friction brakes.

Common Symptoms

  • Hybrid system warning light
  • Reduced EV range
  • Power limitation
  • Check engine light on

Common Causes

  • Battery cell degradation
  • Inverter failure
  • Motor winding damage
  • Cooling system issue
  • High-voltage wiring fault

Estimated Repair Cost

$500 – $5000
Parts and labor (varies by vehicle and location)
Difficulty:Professional

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.