AutoCodes – GMC – P0331 2014 GMC Sierra

P0331 2014 GMC Sierra Code - Knock Sensor Performance Bank 2

Quick Answer

The Knock Sensor system enables the Engine Control Module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation, also known as spark knock. Common causes include Faulty Knock Sensor 2 Bank 2, Knock Sensor 2 Bank 2 circuit poor electrical connection, Knock Sensor 2 Bank 2 harness is open or shorted. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0331 2014 GMC Sierra indicates Knock Sensor Performance Bank 2.
Common causes: Common causes include Faulty Knock Sensor 2 Bank 2, Knock Sensor 2 Bank 2 circuit poor electrical connection, Knock Sensor 2 Bank 2 harness is open or shorted.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 208

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 13, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0331 2014 GMC Sierra Description

The Knock Sensor system enables the Engine Control Module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation, also known as spark knock. The knock sensor system uses one or two flat response 2-wire sensors. The sensor uses piezo-electric crystal technology that produces an AC voltage signal of varying amplitude and frequency based on the engine vibration or noise level. The amplitude and frequency are dependent upon the level of knock that the knock sensor detects. The ECM receives the knock sensor signal through two isolated signal circuits for each knock sensor.
The control module learns a minimum noise level, or background noise, at idle from the knock sensor and uses calibrated values for the rest of the RPM range. The control module uses the minimum noise level to calculate a noise channel. A normal knock sensor signal will ride within the noise channel. As engine speed and load change, the noise channel upper and lower parameters will change to accommodate the normal knock sensor signal, keeping the signal within the channel. In order to determine which cylinders are knocking, the control module only uses knock sensor signal information when each cylinder is near the Top Dead Center (TDC) of the firing stroke. If a knock is present, the signal will range outside of the noise channel.
If the control module has determined that a knock is present, it will retard the ignition timing to attempt to eliminate the knock. The control module will always try to work back to a zero-compensation level, or no spark retard. An abnormal knock sensor signal will stay outside of the noise channel or will not be present. knock sensor diagnostics are calibrated to detect faults with the knock sensor circuitry inside the control module, the knock sensor wiring, or the knock sensor voltage output. Some diagnostics are also calibrated to detect constant noise from an outside influence such as a loose/damaged component or excessive engine mechanical noise.
The Diagnostic Trouble Code (DTC) will be set when the signal from Knock Sensor is low frequency.

OBDII Code P0331 2014 GMC Sierra - Knock Sensor Performance Bank 2 - AutoCodes.com — P0331 2014 GMC Sierra Code - Knock Sensor Performance Bank 2

What does this mean?

What are the Possible Causes of the DTC P0331 2014 GMC Sierra?

Faulty Knock Sensor 2 Bank 2
Knock Sensor 2 Bank 2 circuit poor electrical connection
Knock Sensor 2 Bank 2 harness is open or shorted
Faulty Engine Control Module (ECM)

How to Fix the DTC P0331 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The P0331 code means that the Knock Sensor is not working properly. Problems with the knock sensor will not cause engine performance problems. Replacing the knock sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0331 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0331 2014 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0331 2014 GMC Sierra Code

1. What does code P0331 mean on a 2014 GMC Sierra?

Code P0331 indicates "Knock Sensor Performance Bank 2," meaning the ECM has detected an issue with the signal from the knock sensor on the engine's Bank 2 (the side of the engine opposite Cylinder 1).

2. What are the common symptoms of a P0331 code in a 2014 GMC Sierra?

Symptoms can include poor engine performance, reduced fuel efficiency, engine knocking or pinging, and the illumination of the Check Engine Light.

3. What causes the P0331 code to appear in a 2014 GMC Sierra?

Common causes include a faulty knock sensor, damaged sensor wiring, poor electrical connections, excessive engine noise, or engine mechanical problems such as carbon buildup.

4. Can I drive my 2014 GMC Sierra with a P0331 code?

While the vehicle may still be drivable, ignoring the code could lead to engine damage caused by prolonged knocking or detonation. Prompt diagnosis and repair are recommended.

5. How do you diagnose a P0331 code on a 2014 GMC Sierra?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the knock sensor and its wiring for damage, and checking for excessive noise or detonation in the engine.

6. How much does it cost to fix a P0331 code on a 2014 GMC Sierra?

The repair cost depends on the root cause. Replacing a knock sensor typically costs $100-$300, while fixing wiring issues or addressing engine problems may vary significantly.

7. Where is the knock sensor located on a 2014 GMC Sierra?

The knock sensor for Bank 2 is typically located on the engine block, cylinder head, or intake manifold on the side opposite Cylinder 1. Refer to your vehicle’s service manual for the exact location.

8. Can a P0331 code trigger other codes on a 2014 GMC Sierra?

Yes, a P0331 code may be accompanied by other knock sensor-related codes or performance-related codes if the issue affects engine operation.

9. How can I prevent a P0331 code from occurring again on my 2014 GMC Sierra?

Regular maintenance, such as using high-quality fuel, cleaning carbon deposits, and ensuring proper engine operation, can help prevent knock sensor issues.

10. Do I need to replace both knock sensors if I have a P0331 code on my 2014 GMC Sierra?

Not necessarily. You should replace the Bank 2 sensor if it’s diagnosed as faulty, but it’s a good idea to inspect both sensors and their wiring for potential issues.