P0327Ignition System
Knock Sensor 1 Circuit Low (Bank 1)
P0327 means the knock sensor circuit on bank 1 reads a low voltage. Common causes are a short to ground, a failed sensor, or wiring problems.
🚗 Driveable but the ECM may retard timing, cutting power and economy. Diagnose promptly to protect the engine.
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🎯 Top Causes, Ranked by Likelihood
#1Faulty knock sensor$50-$400
An internally shorted sensor reads low.
#2Short to ground in wiring$50-$300
A grounded signal wire pulls voltage low.
#3Connector corrosion$20-$150
Corrosion shifts the signal voltage.
🩺 Common Symptoms
- Check engine light
- Reduced power
- Poor fuel economy
- Pinging under load
- Retarded ignition timing
💰 Repair Cost: DIY vs Shop
📋 Free OBD2 Code Cheat Sheet
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🔧 How to Diagnose P0327
1Read knock sensor live data for a low value
2Inspect the signal wiring for shorts to ground
3Check the connector for corrosion
4Replace the knock sensor if shorted
❓ Frequently Asked Questions
Can I drive with P0327?
Usually yes, but the ECM may retard timing and cut power. Diagnose promptly to protect the engine.
What is the most common cause of P0327?
A faulty knock sensor or a short to ground in the wiring are the most common causes.
How much does P0327 cost to fix?
A knock sensor typically runs $50-$400, though labor can be high if it sits under the intake.
🔗 Related Codes
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