P0328

Severity: Low

Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

Last updated: July 2026

System

Powertrain

Subsystem

Ignition System or Misfire

Code Type

Generic (SAE)

What does P0328 mean?

P0328 is a generic (SAE) powertrain diagnostic trouble code. It is defined as "Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)". It falls under the ignition system or misfire area of the vehicle’s powertrain system, and has the same core meaning across most makes and models.

When is P0328 set?

The onboard diagnostic system sets P0328 when it detects a condition matching "knock sensor 1 circuit high input (bank 1 or single sensor)" in the ignition system or misfire circuit or system. When the fault is confirmed, the module stores the code and, in most cases, turns on a warning light.

This code is generally minor and often relates to a signal, range or performance condition. It should still be inspected, especially if it returns after clearing.

Common symptoms

Check engine light (MIL) illuminated
Rough running, hesitation or loss of power
Increased fuel consumption
Difficulty starting or stalling

Possible causes

A failing or contaminated sensor in the affected circuit
Wiring, connector or ground problems
Vacuum, intake or exhaust leaks
A worn or failing mechanical component
Occasionally, a fault in the control module itself

What to check first

Scan for all stored and pending codes and note the freeze-frame data
Inspect the wiring and connectors for the affected circuit
Check for related leaks, loose components or obvious damage
Test the relevant sensor and its reference/ground with a meter
Clear the code and retest to see whether it returns

Frequently asked questions

What does the P0328 code mean?

P0328 means "Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)". It is a generic powertrain trouble code in the ignition system or misfire area.

Is it safe to drive with a P0328 code?

This code is usually minor, and short-distance driving is often possible, but you should still have it checked — especially if the warning light stays on or the code returns.

How do I fix a P0328 code?

There is no single fix. Start by confirming the code with a scan tool, then work through the likely causes and checks above — inspecting wiring, connectors and the relevant components before replacing any parts. On most vehicles, confirm the diagnosis before repairs.

Can I clear the P0328 code myself?

You can clear the code with an OBD-II scan tool, but if the underlying fault is still present it will usually return. Clearing without repair is only useful to confirm whether the fault is active.

Related codes

P0329

Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)

P0330

Knock Sensor 2 Circuit Malfunction (Bank 2)

P0327

Knock Sensor 1 Circuit low Input (Bank 1 or Single Sensor)

P0331

Knock Sensor 2 Circuit Range/Performance (Bank )

Important

This information is provided for general reference only. It is not repair advice and may not apply to every make or model. Manufacturer-specific codes can differ. Always confirm a diagnosis with a scan tool and, where needed, a qualified technician before replacing parts.