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Diagnose/P0328
P0328Medium SeverityEngine

Knock Sensor 1 Circuit High Input (Bank 1)

What This Means

The knock sensor 1 on bank 1 is producing a signal above the expected voltage range, causing the PCM to excessively retard ignition timing.

Common Symptoms

  • Excessive timing retard
  • Significant power loss
  • Poor fuel economy
  • Check engine light on

Common Causes

  • Faulty knock sensor
  • Short circuit in wiring
  • Engine mechanical noise
  • Sensor mounting issue
  • Wiring touching hot surface

Estimated Repair Cost

$150 – $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.