P0818 - OBD Trouble Code

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The P0818 trouble code is set by the Powertrain Control Module of the vehicle. This is a generic OBD-II code which is concerned with voltage problem. In a four-wheel drive when there’s a problem with its transfer case neutral position switch due to voltage issues this code is set. The PCM detects this by the signal it receives from the switch indicating that the transfer case is in neutral whereas the vehicle in actually in high range or is moving. This malfunction detected by the PCM will be indicative of an issue with the switch itself and result in P0818 code to be set.

The job of the Transfer neutral Position switch in a four-wheel drive is to inform the engine computer or the Powertrain Control module also known a PCM or ECM which drive the vehicle is in (2-wheel, 4-wheel or neutral). When the PCM is able to detect some fault with the switch it will proceed to setting P0818 code.

What causes this problem with the Driveline Disconnect Switch Input Circuit?

• Fault in the transfer case indicator switch, the wiring harness and/or connector
• Malfunctioning neutral position switch
• Problem with the wiring or ground from transfer case switch to the Powertrain Control Module
• Issue with the Powertrain Control Module or PCM

1. Indicator Switch Wiring Harness - Repair and replace the harness as needed. Go for the best quality that matches your vehicle.
2. Neutral Position switch Connector - Check the connector for damages and repair it. At time replacement may be the only way to correct P0818 error.
3. Neutral Position Switch - You may need to replace the switch to get rid of the OBD error P0818 if repairs don’t help.
4. Powertrain Control Module - Purchase the best quality PCM from Parts Avatar, we ship across Canada and provide free shipping on orders over $99. Order Online today and get rid of P0818 error.
5. Engine Control Module - Replace your ECM is needed with Parts Avatar. We have a wide range of auto parts that you buy online from the comfort of your home. Take help from our online customer service 24/7 to get exactly what you’re looking for.
6. Diagnostic Tools - Only the best and accurate diagnostic tools will help you when trying to resolve the P0818 code. We stock a wide range of brands for you to select as per your requirement. 

Next important thing you need to know about are the common symptoms for this obd error code P0818 with your fuel volume control.

Common Symptoms

The P0818 code basically indicates that the transfer case is in neutral when the vehicle is not. Hence, you may not find any noticeable symptoms apart from the ‘check engine’ light being illuminated. If your vehicle is flashing this code, it is recommended to check if your transfer case shifts from high range to neutral and low range.

Wish to correct this error code with your vehicle? Do you know what all you should do to make your car free from this code? Well, don’t worry! We are here to guide you.

• Replace the Transfer Case Neutral Position Switch
• Replace any damaged wiring
• Replace any damaged connectors of the Neutral Position Switch
• Clean any poor grounds for The Neutral Position Switch

If you need any parts to fix this problem you can easily find them with Parts Avatar. Not only that we also have in stock the best in range auto parts and that too at the most budget friendly prices ever online. Whether you need an Indicator Switch Wiring Harness, Connector, Neutral Position Switch, Engine Computer, Four Wheel you can simply rely on us for quality auto parts.

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

The first thing to do is to the clear the code and resets the Powertrain Control Module. Next, it’s time to see if the transfer case is in normal position or not. You will have to then take the vehicle for a test drive and see if the P0818 code is re-set. If you notice that it has not and the PCM enters readiness mode, you may have an intermittent condition, and in most situations the problem has to worsen to be able to diagnose it correctly.

However, if the code returns, you have to shift your focus to the switch connector and the wiring harness. Test them both using the Digital volt/Ohm meter or DVOM for resistance. See if the readings match with those specified by the manufacturer for your specific vehicles make and model. Be sure to match your vehicle accurately with the code in the Technical Service Bulletins. If you notice that they aren’t fitting in the manufacturers prescribes range then they will have to be replaced. However, if you find that they are within the range, then most likely the problem is with the neutral position switch itself, you will then have to test it for resistance and repair or replace as needed depending on the extent of damages.

The P0818 code can also be caused by a bad ground or connector present between the Powertrain Control Module and the transfer case wiring harness, even though this is very rare. You can rule this out only after you have confirmed that both the neutral position switch as well as the wiring harness are both in good working condition and do not require any mechanical attention whatsoever.

Common mistakes when diagnosing the P0818

Replacing parts before clearing codes and resetting the Engine Control Unit and test driving the vehicle to rule out driver error.