P0328 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado?
- 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 2018 Chevrolet Silverado?
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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code
1. What does the OBDII code P0328 mean on a 2018 Chevrolet Silverado?
P0328 indicates that the Engine Control Module (ECM) has detected a high voltage signal from the knock sensor circuit on Bank 1.
2. What are the common symptoms of the P0328 code in a 2018 Chevrolet Silverado?
Symptoms may include poor engine performance, reduced fuel economy, engine knocking or pinging, and the illumination of the Check Engine Light.
3. What causes the P0328 code in a 2018 Chevrolet Silverado?
Common causes include a faulty knock sensor, damaged or corroded wiring in the knock sensor circuit, a loose or disconnected sensor connector, or an issue with the ECM.
4. Can I continue driving with a P0328 code on my 2018 Chevrolet Silverado?
While the vehicle may still be drivable, it’s not recommended to ignore this issue as it could lead to engine damage over time due to improper ignition timing or unaddressed knocking.
5. How do you diagnose the P0328 code on a 2018 Chevrolet Silverado?
Diagnosis involves scanning for trouble codes, inspecting the knock sensor and its wiring, checking for proper sensor operation, and testing the voltage and resistance in the circuit.
6. How much does it cost to fix the P0328 code on a 2018 Chevrolet Silverado?
Repair costs can vary but typically range from $100 to $300 for parts and labor, depending on whether the knock sensor or wiring needs replacement.
7. Where is the knock sensor located on a 2018 Chevrolet Silverado?
The knock sensor for Bank 1 is typically located on or near the engine block, cylinder head, or intake manifold on the side of the engine corresponding to Bank 1.
8. Can a bad fuel type cause the P0328 code in a 2018 Chevrolet Silverado?
Using low-quality or incorrect octane fuel can contribute to engine knocking, but it’s unlikely to directly cause the P0328 code. It's more often caused by sensor or circuit issues.
9. How is the P0328 code fixed on a 2018 Chevrolet Silverado?
Common fixes include replacing the knock sensor, repairing damaged wiring, cleaning corroded connectors, or reprogramming the ECM if necessary.
10. Can a faulty ECM cause the P0328 code in a 2018 Chevrolet Silverado?
Yes, although it’s less common, a malfunctioning ECM can misinterpret sensor data and trigger the P0328 code. This should be checked only after ruling out sensor and wiring issues.
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