Replaced Knock Sensor Still Getting Code P0332, P0325, P0327

Replaced Knock Sensor Still Getting Code

The knock sensor detects engine knocking in the car. A knock sensor is a device that is installed on the engine block to detect knocking noise. It is very important in preventing engine damage.

If your vehicle has a knock sensor, it’s important to keep an eye on the code. Replaced sensors can still generate a code. If the code is not resolved within a certain amount of time, it can worsen the condition of the car. Read this post to learn how to fix it.

Related Post: Car Knock Sensor: What It Does, How It Works & Why It Occurs

Replaced Knock Sensor Still Getting Code

What Is Knock Sensor
Knock Sensor

The knock sensor fault can be checked in many ways, including visual inspection, testing with the multimeter, and testing with an oscilloscope. The inspection of DTC (Diagnostic Trouble Codes) is found by OBD – II which performs testing of each component, and the diagnosis process can be easy. The DTC shown by the fault of the knock sensor are P0332, P0325, and P0327.

Replaced Knock Sensor Still Getting Code P0332

The DTC P0332 shows when the output voltage from the knock sensor is incredibly low. It means that the sensor is offline, and the readings are not being back to the Engine Control Module. This code shows that the ECM is not able to pick the readings from the knock sensor and the readings are exceedingly small to be accurate.

To fix this issue, the one solution is to replace the knock sensor. Normally, the solution of the P0332 code is only the replacement of the knock sensor, but the defect can occur in the other components of the vehicle, which are the exhaust gas recirculation and cooling system or the electrical system of the vehicle.

After fixing the issue by yourself, if the same code still appears. You should keep in mind that this code is not an easy one to troubleshoot or fix at home. There is a risk in fixing it by yourself. The problem may occur in the electrical system after replacing the knock sensor. Keep in mind or note down the connection of all the wires connected to the knock sensor and then perform the fixing by yourself. The common diagnosis and replacement mistake is replacing the knock sensor without inspecting the wiring or connectors first.

Replaced Knock Sensor Still Getting Code P0325

The DTC P0325 shows the defect in the knock sensor and circuit bank 1. The ECU will detect this fault when it does not receive the proper information from the knock sensor. This illuminates the Check Engine Light on the dashboard. The reasons for this code to appear may be a failed ECU, a failed knock sensor, an open or short in the cable assembly, and electrical connection faults.

Always follow the vehicle manual while troubleshooting and repairing diagnostic trouble codes. The root cause of these issue codes can be fixed in a variety of ways, depending on the automobile manufacturer. By repairing the following components, the DTC P0325 may be fixed. The first is to replace the ECU, repair or replace the cable assembly, replace a defective knock sensor, and fix the fault in the electrical connections.

If after fixing the issue for P0325, it still displays on the dashboard for the defect in the knock sensor, check that the sensor which you have replaced is genuine or not and that there was not any fault in the new one. Because the knock sensor has to be replaced with the DTC P0325. The electrical connections and other wiring harnesses must be checked again for faults.

Replaced Knock Sensor Still Getting Code P0327

The DTC P0327 shows for Knock Sensor 1 Circuit Low Input. It displays when the PCM (Powertrain control module) detects incredibly low voltage readings from the primary knock sensor circuit of the vehicle.

The solutions for this are to check the resistance of the knock sensor and make a comparison of the resistance with the manual value. Also, check for open wires leading to the knock sensor. Inspect the wiring and connections from the knock sensor, PCM, and ECM.

Make sure the supply of the correct voltage to the knock sensor. Inspect for grounding of the sensor as well as the circuit. Replace the knock sensor. If after fixing, it still appears then the wiring back to the ECM will need to be toned out. Verify all wiring and that the connecting prong has not been pushed out of the plastic clip.

When the DTC appears on the dashboard, inspect for the reason immediately. If it is related to the knock sensor, check its connectivity. Otherwise do visit the repair shop to replace or repair the knock sensor immediately.


In conclusion, if you have replaced your knock sensor and are still getting codes P0332, P0325, or P0327, there are a few things you can check. First, make sure the new knock sensor is the correct one for your vehicle. Next, check the wiring harness for the knock sensor to make sure it is secure and free of any damage. Finally, clear the codes and see if they come back.

Related Post: How To Replace Knock Sensor (7 Steps): A Step-By-Step Guide

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