If you’re experiencing the P0603 error code on your 7.3 Powerstroke, don’t worry – you’re not alone.
This is a common issue that many diesel truck owners experience. In this blog post, we’ll walk you through the steps to fixing this error code.
P0603 Error Code on 7.3 Powerstroke
The P0603 error code indicates that there is a malfunction in the internal control module keep alive memory (KAM) circuit. This can be caused by a variety of factors, including a weak battery, a faulty alternator, or a damaged wiring harness.
P0603 Internal control module KAM (keep alive memory) error
The P0603 trouble code is related to a malfunction in the Internal Control Module (ICM) Keep Alive Memory (KAM) system.
The KAM is responsible for storing certain parameters and settings, such as the idle speed, fuel trim values, and other system parameters, even when the vehicle is turned off.
This information is crucial for the proper functioning of the vehicle, and a malfunction in the KAM system can lead to drivability issues.
When this error code is triggered, it means that the ICM has detected an error in the KAM system, and has not been able to maintain the stored values.
This can happen due to a variety of reasons, including a malfunctioning battery or alternator, a blown fuse, or a faulty ICM.
In order to diagnose and fix this issue, it is recommended that you take your vehicle to a qualified mechanic or dealership.
They will be able to use specialized diagnostic equipment to determine the root cause of the problem, and then make the necessary repairs to get your vehicle back to proper working order.
Code P0603 Possible Causes
The P0603 code can be caused by a variety of issues related to the Internal Control Module’s Keep Alive Memory (KAM) system. Here are some possible causes:
- Dead or Weak Battery: A weak or dead battery can cause the KAM system to malfunction and trigger the P0603 code.
- Faulty Alternator: A faulty alternator can also cause the battery to be weak or dead, leading to the P0603 code.
- Blown Fuse: A blown fuse in the KAM circuit can cause the system to malfunction and trigger the P0603 code.
- Faulty Internal Control Module (ICM): The ICM may be faulty, causing the KAM system to malfunction and triggering the P0603 code.
- Wiring Issues: There may be wiring issues, such as damaged or corroded wiring or loose connections, in the KAM circuit that are causing the P0603 code.
- Faulty Powertrain Control Module (PCM): In rare cases, a faulty PCM can cause the P0603 code to be triggered.
It is important to note that these are just some possible causes of the P0603 code, and a proper diagnosis is necessary to determine the actual cause of the issue.
How to Fix P0603 error code on a 7.3L Powerstroke?
The P0603 error code on a 7.3L Powerstroke diesel engine indicates a problem with the Internal Control Module’s (ICM) Keep Alive Memory (KAM) system. Here are some steps that can be taken to fix this error code:
- Check the battery: Start by checking the battery’s voltage and ensuring that it is fully charged. A weak or dead battery can cause the KAM system to malfunction and trigger the P0603 code.
- Check the alternator: A faulty alternator can cause the battery to be weak or dead, leading to the P0603 code. Check the alternator’s voltage output to ensure that it is charging the battery properly.
- Check the fuses: Check the fuses in the KAM circuit to ensure that they are not blown. Replace any blown fuses.
- Check the wiring: Inspect the wiring in the KAM circuit for any damage or corrosion. Repair or replace any damaged or corroded wiring.
- Replace the ICM: If the above steps do not resolve the issue, the ICM may be faulty, causing the KAM system to malfunction and triggering the P0603 code. Replace the ICM with a new one.
It is important to note that these are general steps, and the exact steps required to fix the issue may vary depending on the specific vehicle and the underlying cause of the problem. If you are not familiar with these steps, it is recommended that you take your vehicle to a qualified mechanic or dealership for proper diagnosis and repair.
What are the symptoms of the P0603 error code?
The symptoms of the P0603 error code can vary depending on the severity of the problem. Here are some common symptoms associated with this code:
- Check Engine Light: The most common symptom of the P0603 error code is the illumination of the Check Engine Light on the dashboard.
- Hard Starting: If the KAM system is not functioning properly, it can affect the engine’s starting performance, causing it to crank for longer than usual or struggle to start.
- Stalling or Rough Idle: A malfunctioning KAM system can also affect the engine’s idle speed, causing it to stall or run rough.
- Poor Fuel Economy: A malfunctioning KAM system can also affect the engine’s fuel trim values, resulting in poor fuel economy.
- Reduced Power or Performance: If the KAM system is not functioning properly, it can affect the engine’s overall performance, resulting in reduced power or acceleration.
It is important to note that not all of these symptoms may be present, and some symptoms may only occur intermittently.
If you are experiencing any of these symptoms along with the Check Engine Light illumination, it is recommended that you take your vehicle to a qualified mechanic or dealership for proper diagnosis and repair.
P0603 Error code on a 7.3 Powerstroke Tech Note
The P0603 error code on a 7.3 Powerstroke diesel engine indicates a problem with the Internal Control Module’s (ICM) Keep Alive Memory (KAM) system. Here are some technical notes that may be helpful in diagnosing and repairing this code:
- Battery and Alternator: The 7.3 Powerstroke engine is known for its high demand for electrical power, and a weak or faulty battery or alternator can cause a wide range of issues, including the P0603 code. Before attempting any other repairs, it is important to verify that the battery and alternator are functioning properly.
- Fuse Box Issues: The 7.3 Powerstroke’s fuse box is known for developing issues with corroded or loose connections, which can cause electrical problems, including the P0603 code. Inspect the fuse box and wiring connections for any signs of damage or corrosion.
- ICM Location: On the 7.3 Powerstroke engine, the ICM is located under the hood, near the driver’s side firewall. To access the ICM, you may need to remove the air intake assembly and other components.
- ICM Replacement: If the ICM is determined to be faulty, it will need to be replaced with a new one. However, before replacing the ICM, it is important to verify that the wiring and fuse box are functioning properly, as a faulty wiring connection can cause the new ICM to fail as well.
- ICM Programming: After replacing the ICM, it will need to be programmed with the correct software for the vehicle. This can be done using specialized diagnostic equipment and software.
It is important to note that these are just some technical notes, and a proper diagnosis is necessary to determine the actual cause of the issue.
If you are not familiar with these technical notes or are unsure how to proceed, it is recommended that you take your vehicle to a qualified mechanic or dealership for proper diagnosis and repair.
What is the Cost to Diagnose the Code P0603 ?
The cost to diagnose the P0603 error code can vary depending on several factors, including the make and model of the vehicle, the location of the repair shop, and the severity of the underlying issue. Here are some typical costs associated with diagnosing this error code:
- DIY Diagnosis: If you have the necessary tools and expertise, you may be able to diagnose the P0603 error code yourself. This can save you money on diagnostic fees, but keep in mind that misdiagnosis or further damage to the vehicle may occur without proper training and experience.
- Professional Diagnosis: If you take your vehicle to a qualified mechanic or dealership for diagnosis, the cost can range from $75 to $150 for a standard diagnostic test. However, if further testing or repairs are needed, the cost can increase significantly.
- Replacement Parts: If the issue is found to be a faulty ICM, the cost to replace the part can range from $200 to $500, depending on the make and model of the vehicle.
It is important to note that these costs are estimates and can vary widely depending on the specific circumstances.
If you are unsure about the cost or need further information, it is recommended that you consult with a qualified mechanic or dealership.
How do I clear P0603 on the 7.3 Powerstroke engine?
Clearing the P0603 error code on a 7.3 Powerstroke engine requires repairing the underlying issue that is causing the code to appear.
Once the underlying issue has been fixed, the code can be cleared using an OBD-II scanner or code reader. Here are the steps to clear the P0603 code:
- Connect the OBD-II scanner or code reader to the vehicle’s diagnostic port.
- Turn the ignition switch to the “on” position, but do not start the engine.
- Follow the instructions on the scanner or code reader to read the diagnostic trouble codes stored in the vehicle’s computer.
- Select the option to clear the codes. This may be labeled “clear codes,” “erase codes,” or something similar.
- Wait for the scanner or code reader to confirm that the codes have been cleared.
- Turn off the ignition and disconnect the scanner or code reader from the diagnostic port.
It is important to note that simply clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to reappear.
Therefore, it is important to diagnose and repair the issue before clearing the code. If you are unsure how to proceed or need further assistance, it is recommended that you consult with a qualified mechanic or dealership.
Wrap up
In summary, the P0603 error code on a 7.3 Powerstroke engine indicates a problem with the Internal Control Module’s Keep Alive Memory system.
This can cause a range of symptoms, including rough idle, stalling, and reduced power. To fix this issue, you may need to inspect and repair the battery, alternator, fuse box, wiring, or ICM.
The cost to diagnose and repair the issue can vary widely depending on the specific circumstances.
Once the underlying issue has been fixed, the code can be cleared using an OBD-II scanner or code reader.
However, simply clearing the code without addressing the underlying issue is not recommended, as the code is likely to reappear.
If you are unsure how to proceed or need further assistance, it is recommended that you consult with a qualified mechanic or dealership.