Guide To P033D OBD Error Code Solutions

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The P033D fault code can be described as Knock Sensor 4 Circuit High Bank 2.

Always maintain your car knock sensor, fuel octane as well as engine control module properly or else the OBD Code P033D could start appearing. This code generally applies to OBD-II vehicles. A lot of vehicles may face this trouble code like Volvo, Ford, Audi, Hyundai etc.

This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

What causes this problem with the Knock Sensor 4 Circuit High Bank 2?

• Defects in the knock sensor connector
• Knock Sensor 4 Bank 2 harness might be opened or shorted
• Failure in the powertrain control module
• Defaults in the Knock Sensor 4 Bank 2
• Knock sensor circuit might be opened or shorted to ground
• There can be moisture in knock sensor connectors
• Incorrect fuel octane
• Knock sensor circuit can be shorted to voltage
• Flaws in the knock sensor
• Knock Sensor 4 Bank 2 circuit might have bad electrical connection
• Quirks in the engine control module

1. Engine Control Module - Do you remember when was the last time you got your car Engine Control Module inspected? Faulty Engine Control Module can cause a lot of issues like displaying P033D code.
2. Engine Parts - Poor Engine Parts can cause a lot of difficulties, so why not get it replaced at time?
3. Fuel Delivery System Parts - Are there some faults in your Fuel Delivery System Parts? Don’t waste time and get them replaced or else P033D code can turn up.
4. Fuel Ignition System - OBD Code P033D can appear because of faulty Fuel Ignition System.
5. Powertrain Control Module - Everything is fine with Fuel Ignition System and still P033D code triggering? Then you must get your Powertrain Control Module checked.
6. Diagnostic Tools - Willing to purchase some top-notch diagnostic tools online? We are here at your service.
7. Knock Sensor - A lot of issues can arise do to defective Knock Sensor. Did you just see P033D code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P033D code by mentioning some major symptoms below:

Common Symptoms

• The malfunction indicator lamp can start appearing
• Issue of audible knocking from the engine compartment
• There can be pinging from engine under acceleration

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 P033D:

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

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

If an engine knock can be heard, then you must fix the source of the mechanical problem first then retest. Make sure the proper octane of fuel was used in the engine. Using lower octane fuel than what is specified can cause a ping or pre-detonation and may cause P033D.

Unplug the knock sensor and check for water or corrosion in the connector. If the knock sensor has a seal, verify there is no coolant from the engine block fouling the sensor. Repair as per the requirement.

Turn ignition to run position with engine off. Ensure that 5 Volts are present at the KS #4 connector. If there is, check for proper resistance between KS terminal and engine ground. You will need a vehicle specification for this. If resistance is out of specification, then you must replace the knock sensor. If resistance is normal, plug KS back in and idle the engine. Using a scan tool in data stream, observe KS value. Does it indicate a knock is present at idle? If so, replace the knock sensor.

If the knock sensor shows no knock at idle, then tap on the engine block while observing the knock signal. If it doesn't show a signal that corresponds with the taps, replace the knock sensor. If it does, verify the knock sensor wiring isn't routed next to ignition wires. If there was no 5 volts present at the knock sensor connector while unplugged with Key on engine off then go back to the PCM connector. Turn ignition off and clip the knock sensor 5 volt reference wire in a location that is easy to repair or remove the wire from the PCM connector. With Key on engine off, check for 5 volts on the PCM side of the clipped wire. If 5 volts isn't present, suspect a bad PCM. If 5 volts is present, then you should repair short in 5 volt reference circuit.

Since the reference circuit is a shared circuit, you will need to check all engine sensors that are fed a 5 volt reference. Unplug each sensor one at a time until the reference voltage returns. When it returns the last sensor, you plugged in is the shorted sensor. If no sensors are shorted, check the wiring harness for short to voltage on reference circuit.

Common Mistakes When Diagnosing The P033D Code

• There can be some defects in the powertrain control module
• The knock sensor can fail
• Issues with the wiring