P0327

Medium Severity

Knock Sensor 1 Circuit Low (Bank 1)

Ignition System

What Does P0327 Mean?

Knock sensor signal is below expected minimum. Usually an open circuit or failed sensor.

Common Fix

Replace knock sensor

Estimated Cost (DIY)

$20 - $400

Symptoms

  • ⚠️Reduced power
  • ⚠️Poor economy
  • ⚠️Check engine light

Related Symptoms

Check engine light on

Common Causes

Failed knock sensorlikely
Loose sensorpossible
Open wirepossible

How to Diagnose P0327

  1. 1Check sensor torque and connector
  2. 2Measure resistance
  3. 3Check wiring
  4. 4Replace sensor

OEM Diagnostic Flowchart

Scroll to load technician if/then branches.

Read live data and freeze frame for P0327 to pinpoint the cause before buying parts.

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Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0327.

OEM Manual Evidence

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2013 GMC Truck Yukon XL Denali AWD V8-6.2L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali AWD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...

2013 GMC Truck Yukon XL Denali 2WD V8-6.2L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL Denali 2WD V8-6.2L Service Manual | Operation CHARM Operation CHARM : Car...

2013 GMC Truck Yukon XL 4WD V8-6.0L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-6.0L Service Manual | Operation CHARM Operation CHARM : Car repair...

2013 GMC Truck Yukon XL 4WD V8-5.3L A L L Diagnostic Trouble Codes ( DTC )OEM Manual

A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Yukon XL 4WD V8-5.3L Service Manual | Operation CHARM Operation CHARM : Car repair...

Related Symptoms

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Check engine light onSymptom Hub

A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.

Exact Vehicle Hubs

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2013 Gmc Truck Yukon Xl 4wd V8 5.3l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0327.

2013 Gmc Truck Yukon Xl 4wd V8 6.0l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0327.

2013 Gmc Truck Yukon Xl Denali 2wd V8 6.2l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0327.

2013 Gmc Truck Yukon Xl Denali Awd V8 6.2l Repair HubManual

Open the exact vehicle hub grounded by OEM manual evidence related to P0327.

Related Codes

P0325: Knock Sensor 1 Circuit (Bank 1)Related

The knock sensor on bank 1 has a circuit fault. Without it, the ECM cannot detect engine knock (detonation) and must retard ignition timing for safety.

P0328: Knock Sensor 1 Circuit High (Bank 1)Related

Knock sensor signal is too high. Could be a noisy engine or a sensor fault.

Frequently Asked Questions

What causes a knock sensor to fail?
Age, heat cycling, and corrosion. Knock sensors are piezoelectric and wear out over 100K+ miles.
Does knock sensor torque matter?
Yes — knock sensors must be torqued to spec (typically 15-20 ft-lbs). Too loose or too tight causes incorrect readings.

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