P2904High SeverityHybrid/EV

Hybrid Battery Pack Cell Imbalance

What This Means

One or more cells in the hybrid battery pack have significantly different voltage levels. This reduces overall battery capacity and performance.

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.