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Diagnose/P0078
P0078Medium SeverityEngine

Exhaust Valve Control Solenoid Circuit (Bank 1)

What This Means

The exhaust valve control solenoid circuit on bank 1 has a general malfunction. This controls the exhaust side of the variable valve timing system.

Common Symptoms

  • Rough idle
  • Increased emissions
  • Power loss
  • Check engine light on

Common Causes

  • Faulty exhaust VVT solenoid
  • Wiring issue
  • Poor connector
  • PCM driver fault
  • Oil contamination

Estimated Repair Cost

$100 – $500
Parts and labor (varies by vehicle and location)
Difficulty:Moderate

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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.