P0405 6.0 Powerstroke

The Ford 6.0L Powerstroke PCM is known to bring up many error codes, one of which is P0405, which relates to the EGR system. If you are trying to solve the P0405 6.0 Powerstroke issue and need help understanding what needs to be done, this article aims at providing insight into the root causes and corrective measures for such a code with minimal household equipment.

What Does P0405 6.0 Powerstroke Means?

P0405 is a diagnostic trouble code (DTC) commonly associated with the Ford 6.0L Powerstroke engine system. It stands for "Exhaust Gas Recirculation Sensor Circuit A Low". It indicates that the sensor is sending information to the powertrain control module, indicating a lower EGR Valve position than recommended. The root cause often lies in a faulty EGR Valve, and not necessarily with the sensor itself.  The purpose of an EGR Valve position sensor is to keep nitrogen oxide (NOx) levels under control by providing constant feedback on the valve's position relative to what has been specified by PCM parameters.

Symptoms Of Getting The P0405 Code On A 6.0

Symptoms Of Getting The P0405 Code On A 6.0
Symptoms Of Getting The P0405 Code On A 6.0

The 6.0L Powerstroke has the potential to give out the P0405 code, which is accompanied by a set of symptoms. It would be wise to be aware of these symptoms should this issue arise:

  • Check Engine Light (CEL) is Activated
  • Rough Driving Experience
  • Engine Stall Issue
  • Disabled EGR system

The Causing Factors Of The Error Code P0405

The root cause of P0405 is often attributed to a faulty EGR valve; however, other factors may be responsible for triggering the error code. Therefore, it's crucial to identify and address all possible causes of P0405 in order to ensure optimum performance:

  • Low Voltage From The EGR Valve Position Sensor
  • EGR Valve is Plugged or Clogged
  • A Faulty PCM (Rare Case)

The code is set because a faulty PCM may cause other codes besides the P0405.

How Serious Is Code P0405 On 6.0L Powerstroke

When the error code P0405 is triggered, it is most likely that the EGR system will be disabled. An inactive or faulty EGR will not help with NOx emission control and may also result in legal consequences. The Check Engine Light (CEL) remains illuminated until this issue is resolved, making it difficult to identify any other engine problems that could be present. To avoid complications from arising, it is advisable to address the code as soon as possible.

How To Solve P0405 Error Code On 6.0L Powerstroke?

Solving the code P0405 is easily achieved by those with basic tool usage knowledge. The necessary tools for the journey are all at hand:

  • Electric Screwdriver
  • Crow Foot Pry Bar
  • Digital Volt/Ohm Meter
  • OBD-II Scanner

Having the necessary tools is essential for successful troubleshooting. It is vital to be familiar with how to use them properly before beginning any task. With that in mind, we can now proceed with exploring the available methods of troubleshooting:

Clean The EGR Valve

When the EGR valve is in a particular position, carbon particles can get into it more easily. Over time, heavy layers of dust and carbon build up on the valve, causing it to become clogged or plugged. When this happens, you may experience an error code known as P0405. As such, it's recommended that you clean the EGR valve prior to replacing it altogether.

Here’s how you can take out the EGR valve & clean it nicely:

  • Step 1: Open the hood & locate the EGR valve.
  • Step 2: This valve is supported by two eight mm head screws. Unscrew them with an electric screwdriver.
  • Step 3: Now, you’ll need a regular crowfoot pry bar to pull out the EGR valve.

Finally, the code can be reset using a scanner. It is essential to verify that the code returns after it has been reset.

Replace The EGR Valve

The error code P0405 typically indicates that the EGR valve is malfunctioning. Replacing it is usually the only solution if the cleaning has not been successful in resolving this issue.

Here is how you can remove & replace the EGR valve with your essential household tools: 

  • Step 1: Open the hood & locate the EGR valve.
  • Step 2: This valve is supported by two eight mm head screws. Unscrew them with an electric screwdriver.
  • Step 3: Now, you’ll need a regular crowfoot pry bar to pull out the EGR valve.
  • Step 4: Finally, try matching the old EGR valve with the new one & see if they match.
  • Step 5: Replace the EGR valve with the new one & screw the two eight mm head bolts again.
  • Step 6: Close the hood & you’re all set.

Replacement of the EGR valve should resolve the DTC P0405. To ensure a successful resolution, it is recommended to clean the code with a scanner and observe if any further action is necessary.

Replace The PCM

When the replacement of the EGR valve does not solve the code, it is possible that the PCM may be faulty. Ensuring the EGR valve's proper functioning requires 5 volts of electricity from the PCM; a test should be conducted to see if this voltage is present. If there is no voltage at all, then it can be determined that the PCM is indeed faulty, and an expert technician should be consulted before replacing it. For safety reasons, any additional work or replacement should also only be done by experts in order for optimum results.

How Much Does It Cost To Solve The Error Code P0405

Solving the error code for a truck may vary in cost. The total expenditure primarily depends on which replacement parts are needed - such as an EGR Valve and PCM - with prices varying between components. A chart of potential replacements is available, outlining the associated costs.

  • The EGR Valve Costs Around $200
  • The PCM Costs Around $500
  • Electric Screwdriver Costs $120 to $150

It is recommended that an additional labor fee of $75 to $150 per hour be added when obtaining all services from an auto shop.

Common Mistakes While Solving The P0405 Code

Multiple misdiagnoses can occur when addressing the P0405 code, so it is essential to exercise caution and avoid common errors while resolving the issue:

  • Thinking The Injectors Are Faulty
  • Thinking The Turbocharger Is Faulty

Additional Comments To Consider Regarding The P0405 Code

Living without an EGR system is possible. However, certain countries have made its use a requirement. It is, therefore, essential to address any issues associated with the EGR system if one lives in such a country.

Final Thoughts

This article provided sufficient information about the P0405 6.0 Powerstroke, enabling one to identify and fix this code on their own. However, if a replacement of the PCM is necessary - which is an uncommon occurrence - it would be best to consult with an expert in order for them to take care of any possible issues related to that component.

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