Knock Sensor 1 Circuit High Input (Bank 1)
The PCM detected a high voltage from the knock sensor circuit.
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What it means (plain English)
The knock sensor is sending too much voltage to the engine control unit, which can indicate excessive engine vibration or damage if not addressed.
What the computer is actually seeing
The PCM sees a voltage signal higher than its normal operating range, usually above 4.5 volts when it expects between 0.5 to 4.5 volts.
What a healthy reading looks like
Normal knock sensor voltage is typically between 0.5V to 4.5V. Above this range will trigger a fault.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Inspect the wiring and connectors to the knock sensor for damage or corrosion. Repair or replace as needed. Decision: If repaired, clear codes and test drive; if continues, go to step 2.
- 22. Measure the voltage at the knock sensor connector with the engine running. Expect the voltage to be between 0.5V to 4.5V. Decision: If voltage is excessive (>4.5V), sensor may be faulty; if normal, check the engine mounts.
- 33. Check for excessive engine vibration by inspecting engine mounts. Replace any damaged mounts. Decision: If mounts are good, replace the knock sensor and retest.
- 44. Clear codes and perform a test drive. Monitor for reoccurrence of the P0328 code.
Common causes
- Faulty knock sensor
- Damaged wiring or connectors
- Incorrect sensor type installed
- Excessive engine vibration due to poor mounts
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
Moderate severity means it is drivable, but you should fix it soon to avoid engine damage.
Will the code come back after clearing it?
If the underlying issue isn't resolved, the code will likely return.
Why does this code sometimes pair with other codes?
It often pairs with related codes like P0325 due to multiple issues within the knock sensor circuit.
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