P0328 Buick Code - Knock Sensor Circuit High Voltage Bank 1
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 Bank 1, Knock Sensor Bank 1 circuit poor electrical connection, Knock Sensor Bank 1 harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0328 Buick indicates Knock Sensor Circuit High Voltage Bank 1.
- Common causes
- Common causes include Faulty Knock Sensor Bank 1, Knock Sensor Bank 1 circuit poor electrical connection, Knock Sensor Bank 1 harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0328 Buick Description
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 the Knock Sensor Bank 1 is short to voltage for greater than 5s.
What are the Possible Causes of the DTC P0328 Buick?
- Faulty Knock Sensor Bank 1
- Knock Sensor Bank 1 circuit poor electrical connection
- Knock Sensor Bank 1 harness is open or shorted
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0328 Buick?
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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0328 Buick 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.
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Frequently Asked Questions about P0328 Buick Code
1. What does OBDII code P0328 mean on a Buick?
Code P0328 indicates that the knock sensor circuit on Bank 1 is detecting a high voltage signal, which may suggest an issue with the sensor or its wiring.
2. What are the symptoms of a P0328 code in a Buick?
Common symptoms include poor engine performance, reduced fuel efficiency, engine knocking or pinging, and possibly an illuminated Check Engine Light.
3. What causes a P0328 code in a Buick?
Possible causes include a faulty knock sensor, damaged or corroded wiring or connectors in the knock sensor circuit, or an engine control module (ECM) malfunction.
4. Can I drive my Buick with a P0328 code?
While it may be possible to drive, ignoring the code could lead to engine damage if knocking or pinging occurs, so it’s best to address the issue promptly.
5. How is a P0328 code diagnosed in a Buick?
A mechanic will use a scan tool to confirm the code, inspect the knock sensor and its wiring, check for corrosion or loose connections, and test the knock sensor's output voltage.
6. How do you fix a P0328 code on a Buick?
Repairs may include replacing the knock sensor, repairing or replacing damaged wiring or connections, or reprogramming or replacing the ECM if necessary.
7. Where is the knock sensor located on a Buick engine?
The knock sensor is typically located on the engine block, cylinder head, or intake manifold, depending on the specific Buick model and engine type.
8. How much does it cost to fix a P0328 code on a Buick?
The cost can range from $150 to $400, depending on whether the knock sensor, wiring, or ECM needs repair or replacement.
9. Can a bad knock sensor damage my Buick's engine?
Yes, a faulty knock sensor can fail to detect engine knocking, which can lead to severe engine damage if left unresolved.
10. Will clearing the P0328 code fix the problem in a Buick?
Clearing the code will turn off the Check Engine Light temporarily, but it won’t resolve the root issue causing the high voltage in the knock sensor circuit.
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