P0325

Medium Severity

Knock Sensor 1 Circuit (Bank 1)

Ignition System

What Does P0325 Mean?

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.

Common Fix

Replace knock sensor

Estimated Cost (DIY)

$20 - $400

Symptoms

  • ⚠️Reduced engine power
  • ⚠️Poor fuel economy
  • ⚠️Slight pinging under load
  • ⚠️Check engine light

Related Symptoms

Check engine light on

Common Causes

Failed knock sensorlikely
Corroded sensor connectorpossible
Wiring damagepossible
Sensor not torqued properlypossible

How to Diagnose P0325

  1. 1Inspect knock sensor connector
  2. 2Check wiring for damage
  3. 3Measure sensor resistance
  4. 4Verify proper torque if recently serviced

OEM Diagnostic Flowchart

Scroll to load technician if/then branches.

Read live data and freeze frame for P0325 to pinpoint the cause before buying parts.

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Related Resources

Repair guides, symptom pages, and wiring diagrams related to P0325.

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 P0325.

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

Open the exact vehicle hub grounded by OEM manual evidence related to P0325.

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

Open the exact vehicle hub grounded by OEM manual evidence related to P0325.

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

Open the exact vehicle hub grounded by OEM manual evidence related to P0325.

Related Codes

P0327: Knock Sensor 1 Circuit Low (Bank 1)Related

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

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

Can I drive without a knock sensor?
Yes, but the ECM retards timing for safety, reducing power and fuel economy by 5-10%.
Where is the knock sensor?
Usually bolted to the engine block or under the intake manifold. On some engines it is hard to reach.

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