P0325: Knock Sensor 1 Circuit Malfunction (Bank 1)
The engine computer sees an electrical problem with the knock sensor, which listens for engine ping.
Green, yellow, red: three ways P0325 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Light on, drives fine.
Schedule a repair
Noticeable power loss or pinging. Repair soon.
Stop and get help
Heavy knocking. Ease off and get it checked; knocking can damage pistons.
Symptoms you might notice
- Usually none
- Slight power loss (timing pulled back for safety)
Common causes, cheapest first
- Failed knock sensor
- Damaged wiring (often under the intake manifold)
- Corroded connector
What you can check before calling
- Note any pinging when accelerating
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More engine sensors codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0325 mean?
P0325 means "Knock Sensor 1 Circuit Malfunction (Bank 1)". The engine computer sees an electrical problem with the knock sensor, which listens for engine ping.
Can I drive with code P0325?
It depends on what the vehicle is doing. Green: Light on, drives fine. Yellow: Noticeable power loss or pinging. Repair soon. Red: Heavy knocking. Ease off and get it checked; knocking can damage pistons.
What causes P0325?
The most common causes are: failed knock sensor; damaged wiring (often under the intake manifold); corroded connector.
Is P0325 a serious code?
It can be. Heavy knocking. Ease off and get it checked; knocking can damage pistons.
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