Error Code P033C: What It Means & What To Do?

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Are you facing some issues with your powertrain control module? Saw some faults with the ignition system? Or is the knock sensor control wiring as well as connectors are defective? If the answer to all these questions is a YES, then your vehicle is definitely facing OBD P033C error.

The P033C fault code can be described as Knock Sensor 4 Circuit Low Bank 2.

The engine knocking can be sensed by the knock sensor by using a piezoelectric element. The sensor is attached to the cylinder block, cylinder head as well as intake manifold. The knocking vibration from the cylinder block can be sensed as vibrational pressure.

This pressure would then be converted into a voltage signal and would be then sent to engine control module. This signal is then used by the engine control module to retard the ignition timing and protect the engine from damaging pre-ignition.

What causes this problem with the Knock Sensor 4 Circuit Low (Bank 2)?

• Problem of ignition misfire
• The knock sensor might be faulty
• There can be some internal engine problem
• Contaminated or subpar fuel
• Defective knock sensor control wiring as well as connectors
• Issues with the PCM or a PCM programming error
• The knock sensor 4 bank 2 might have some defects
• Bad electrical connection in the knock sensor 4 bank 2 circuit
• Opened or shorted knock sensor 4 bank 2 harness
• Defaults in the engine control module

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3. Knock Sensor - Everything is fine with the engine control module and still OBD code P033C flashing? Then there is definitely some fault with the Knock Sensor. Get it checked and replace if needed.
4. Fuel Delivery System Parts - Fuel Delivery System Parts should never be neglected. May be there is some fault in them due to which P033C code may start flashing.
5. Powertrain Control Module - A faulty Powertrain Control Module can be troublesome. You can always rely on us as we have best auto parts for our customers.
6. Engine Control Module - If everything is alright with Knock Sensor, then there is surely some defect in Engine Control Module. Get it replaced before the situation gets worse.
7. Fuel Ignition System - P033C code can display due to some flaws in the Fuel Ignition System. So, it is very important to replace the Fuel Ignition System with us at equitable prices.

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P033C code by mentioning some major symptoms below:

Common Symptoms

• Decrease in the overall engine performance
• Abnormal noises can start coming from the engine area
• There can be hesitation when accelerating
• The fuel consumption might start increasing

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P033C:

• Make sure that the faulty knock sensor should be replaced
• If you find out that there are some issues in the powertrain control module, then replace it
• Correct the issue of ignition misfire
• Replace or repair the knock sensor control wiring or connectors

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Here are some steps which you should follow in order to diagnose this fault code:

If you want to diagnose the P033C fault code, then you must need a diagnostic scanner, a digital volt/ohmmeter and a reliable vehicle specific repair resource will be necessary. If the engine sounds like it is knocking, or excessively noisy, address that issue before attempting a diagnosis for any knock sensor codes.

You should carefully check for technical service bulletins that may apply to your year/make/model. If the issue is a known issue there may exist a bulletin to help with diagnosis and repair specific to your exact problem. It can save a lot of your time as well as money.

You must do a visual inspection of all system related wiring harnesses and connectors. Look for corroded, burnt, or otherwise damaged wiring and connectors that may create an open or shorted circuit. Knock sensors are often in the lower part of the engine block. This makes them susceptible to damage when heavy parts like starters and engine mounts are replaced. System connectors, wiring, and fragile knock sensors are frequently broken during repairs in the vicinity.

Connect the OBD-II scanner to the vehicle diagnostic connector and retrieve all stored diagnostic codes and freeze frame data. Write this information down for use in the diagnostic process. Clear the codes and test drive the vehicle to see if any are reset.

If you find out that the P033C code is reset, then you must start the engine and use the scanner to observe knock sensor data. If the scanner indicates that knock sensor voltage is not within manufacturer’s specifications, use the DVOM to test live data at the knock sensor connector. If the signal at the connector is within specs, suspect a wiring issue between the sensor and the PCM. If voltage at the knock sensor connector is not within specifications, suspect a defective knock sensor. If replacement of the sensor is the next step, be sure to ensure you don't come in contact with hot coolant. Wait for the engine to cool before removing the old sensor.

Common Mistakes When Diagnosing The P033C Code

• There can be some defects in the powertrain control module
• Some failure in the knock sensor
• The issue of wiring may arise