Definition of the code P0325
Knocked combustion sensor malfunction (sensor 1, Bank 1)
What does code P0325 mean?
P0325 is an ODB2 general diagnostic code related to the knock combustion sensor circuit. This code can be seen with other knock sensor codes and low power condition codes.
P0325 means that there is a fault in knock sensor 1 in circuit bank 1. This fault will be detected by the ECU when it does not receive the correct information from the knock sensor. This causes the Check Engine light on the instrument panel to come on.
What causes code P0325?
- ECU Fault
- Knocked combustion sensor defective
- Open circuit or short circuit in the wiring harness.
- Problems with electrical connections
What are the symptoms of code P0325?
- An illuminated Check Engine light is usually the most noticeable symptom.
- The engine may have a slight lack of power.
- You may not have any symptoms in P0325.
How can a mechanic diagnose the P0325 code?
- Use the scan tool to look for any codes, there may be historical, pending and current codes.
- Note the freeze frame data for each of these codes will show the vehicle status when the code was set, such as engine speed, coolant temperature, running time and vehicle speed.
- Delete the code to start the diagnostics again.
- Perform a road test to retest the check engine light and confirm that the problem is present.
- Use the scan tool to check that the knock combustion sensor is working properly when the engine is running at high speed.
- Check the resistance of the knock combustion sensor
- If necessary, check the ECU test according to the manufacturer’s test procedures.
Frequent errors when diagnosing the P0325 code
With any code, even the most experienced technician can make simple mistakes and overlook basic issues if he or she does not perform all the diagnostic steps or perform them in the correct order.
How serious is the P0325 code?
The P0325 code is generally not serious, and you should be able to drive safely to a safe location after the malfunction occurs. Some vehicles may experience a slight lack of engine power, because the ECU delays the timing to prevent damage if the engine rattles.
What repairs can repair a P0325 code?
- ECU Replacement
- Wiring harness repair or replacement
- Replacement of a defective knock combustion sensor
- Electrical connection repair
Additional notes for note on code P0325
You will need a scan tool that does more than just check codes to make an accurate diagnosis of P0325. Many of the items that are checked can be done much faster and more accurately with the live data stream that these scan tools allow you to access.
