P0603 Code 7.3 Powerstroke

Ford recently announced that they are sending out Diagnostic Trouble Codes (DTCs) to users to inform them about the condition of their 7.3L engine. One of these codes is P0603, which carries its meaning and symptoms. This article aims to comprehensively explain P0603 Code 7.3 Powerstroke, offering information on symptoms and possible solutions for the problem.

What Does P0603 Code 7.3 Powerstroke Mean?

The Ford 7.3L engine is known for its common trouble code, P0603. This code relates to an Internal Control Module Keep Alive Memory (KAM) Error. It occurs when the Powertrain Control Module (PCM) fails to retrieve data from the KAM after several attempts. The KAM acts as a form of Artificial Intelligence, learning from every drive cycle and storing information such as driver preferences to deliver optimal performance each time it is used. When this process fails, P0603 is generated by the PCM and can be identified with diagnostic testing equipment.

Interesting Fact: KAM has been designed to store data permanently, as it is powered directly by a battery.

⚡️Another article: P0603 6.0 Powerstroke

Symptoms Of Getting The P0603 Code On A 7.3

Symptoms Of Getting The P0603 Code On A 7.3
Symptoms Of Getting The P0603 Code On A 7.3

Symptoms associated with Diagnostic Trouble Code (DTC) P0603 could include engine misfires, an illuminated Check Engine Light, and difficulty starting. Knowing the potential signs and symptoms may indicate this code has been triggered.

  • CEL (Check Engine Light) Is On
  • Engine Stalling Issue
  • The Engine Misfires Sometimes
  • The machine is Hard To Start
  • Rough Acceleration & Idling
  • Dramatically Increased Fuel Consumption 

A thorough check of the symptoms should be conducted to ensure accuracy. Obtaining an OBD-II Code Scanner for less than $50 is recommended to confirm that it is a P0603 code.

The Causing Factors Of The Error Code P0603

Aftermarket engine management products are regularly identified as a Diagnostic Trouble Code (DTC) P0603 source. Other aspects that can lead to this code being generated include faulty wiring and components, incorrect installation or calibration of parts, and inadequate power supply.

  • Keep Alive Memory is Not Receiving Enough Power
  • Battery or Keep Alive Memory Has Shorted Out
  • Loose Connection & Battery Terminal Corrosion
  • Malfunctioning Wiring Of Keep Alive Memory (KAM) & Keep Alive Power (KAPWR)
  • Damaged Keep Alive Memory or Powertrain Control Module
  • PCM Internal Fault Due To Water Intrusion
  • Faulty Battery & Charging System

How Serious Is The Code P0603 On 7.3 Powerstroke?

How Serious Is The Code P0603 On 7.3 Powerstroke
How Serious Is The Code P0603 On 7.3 Powerstroke

The outcome of an error code P0603 can range from zero problems to potentially causing damage to the engine. It is important to understand this before taking any further steps to diagnose and resolve the issue properly. To gain a better insight into this topic, please read the following section of this article.

How To Solve P0603 Code 7.3 Powerstroke?

DTC P0603 can be addressed through DIY works. It is recommended to obtain the necessary tools before attempting any diagnosis.

  • A Battery Charger, Flashlight & Multimeter
  • An OBD-II Code Scanner

The procedure required for resolving the DTC P0603 can now commence. With the necessary preparations complete, this process should be relatively straightforward.

Wait Or Remove Aftermarket Engine Management Products

Engineering a truck with aftermarket engine management products is popular for many individuals looking to boost their vehicle's performance. It is normal for those who have incorporated such modifications to experience an error code P0603. While this can be concerning, it will typically go away after a few days without needing further action or removing the modification products.

Check Your Battery Health

Using the car battery charger and filling the battery, the code can be removed using a scanner tool. After that, it is recommended that normal driving of the car is done for at least one week. If, after this period, the Diagnostic Trouble Code (DTC) reappears, it could mean that there is an issue with how much power can be produced by the battery when charged through the use of the truck itself. To resolve this issue permanently, battery replacement should occur before considering other alternative methods, such as replacing writing first.

Inspect Battery Related Wiring

A thorough examination of the battery cables is recommended, paying particular attention to any potential damage, corrosion, or loose connections. If these issues are identified, replacing the wiring should offer a solution to rectifying any battery-related problems.

Check For PCM Wiring Leakage

PCM wiring must be closely inspected when diagnosing the generation of this error code. It is important to ensure that the power supply line provides adequate voltage (12.5V) to the PCM. If the voltage indicates 12.5V, one should try flexing the wire and reassess for any fluctuations in voltage; a change would indicate a broken or loose wire and suggest replacement of said power supply line, which should eliminate the error code.

Update To The Latest PCM Software Version

The P0603 error code is a common issue for Ford owners with the 7.3L engine, and manufacturers often release PCM software updates without much awareness initially. To resolve this problem, drivers should head to their nearest dealer to update the latest PCM software version. If all else fails, replacing the Powertrain Control Module may be necessary - although an experienced professional should do it due to its complexity. Purchasing the PCM separately can help save money on labor costs.

How Much Does The DTC P0603 Cost To Solve?

Fixing the DTC P0603 can range in cost depending on the method used to solve it. Basic wire replacement is typically not overly expensive, leading to a cost that should not exceed $50. Replacing the battery, however, will be more costly and could cost up to $200. The most expensive option of returning the PCM could cost between $500 and over $1500, with an additional labor cost of around $250.

Common Mistakes While Solving The P0603 Code

Familiarizing oneself with Ford's 7.3L is a must if one wishes to avoid errors while trying to decipher the P0603 error code. Taking measures such as knowing what common mistakes should be avoided can help ensure accuracy during the process.

  • Reading The Voltage Wrong While Testing The Power Supply Line
  • Not Testing Everything (Wirings, Connectors & Harness) Before Testing & Replacing The PCM. 

Additional Comments To Consider Regarding The P0603 Code

When disconnecting a car battery, it is standard for the diagnostic trouble code (DTC) to appear. Typically, this code will automatically disappear after a few days; however, if it does not resolve itself, one should heed the advice in this article to ensure that both their finances and engine health are protected.

Last Words

This article was intended to provide the reader with an in-depth understanding of the P0603 Code 7.3 Powerstroke. With this knowledge, one should be able to diagnose any issues related to this code without too much difficulty. It is important for any individual encountering such a problem not to hesitate to get professional help when needed; attempting to remedy the issue on their own may result in further damage.

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