p0327
Moderate
GMC · SUVs
Knock Sensor 1 Circuit Low Input
Quick Answer
Error code P0327 on your GMC SUVs means: Knock Sensor 1 Circuit Low Input. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Locate knock sensor on engine block
2
Inspect sensor connector for corrosion
3
Test sensor resistance with multimeter
4
Check wiring for continuity
5
Replace knock sensor if faulty
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Knock sensor
Electrical connector
Dielectric grease
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