P0328: Knock Sensor 1 Circuit High Input (Bank 1)
Can you still drive? Yes, but performance will be significantly reduced due to timing retard. If actual knock is occurring, switch to higher octane fuel immediately.
What Does P0328 Mean?
Code P0328 is set when the knock sensor on bank 1 reports a higher voltage than the ECM expects. This could indicate actual engine knock, a short in the sensor circuit, or electrical interference from other components. The ECM may aggressively retard timing in response.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Actual engine knock from low-octane fuel
- Short circuit in sensor wiring
- Faulty knock sensor generating false high signal
- Electrical interference from aftermarket accessories
- Loose sensor mounting
Symptoms
- Check engine light on
- Significant loss of power
- Poor fuel economy
- Engine timing over-retarded
- Hesitation on acceleration
Diagnostic Steps
- 1Check if low-octane fuel was recently used
- 2Inspect knock sensor wiring for shorts to voltage
- 3Test knock sensor signal with scan tool while tapping near sensor
- 4Check for aftermarket electrical accessories causing interference
- 5Verify sensor mounting torque
Recommended Parts & Tools
premium fuel additive
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $50 - $400 |
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Frequently Asked Questions
Can bad gas trigger P0328?
Yes, using fuel with a lower octane than recommended can cause real engine knock, which the sensor correctly detects. Try a tank of premium fuel before replacing the sensor.
Will P0328 cause engine damage?
If the high signal is from actual knock and the ECM doesn't retard timing enough, detonation can damage pistons and bearings. Address this code promptly.
Community Fix Reports
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