P0603 Code: Internal Control Module Keep Alive Memory (KAM) Error


Along with controlling the entirety of the hardware that is useful to operate your vehicle, your vehicle’s engine control module stores data in the same manner identified with how you drive. As it understands how you drive, the computer changes parts of vehicle execution to meet your particular necessities, so that you can experience ideal vehicle execution. This memory stockpiling part is known as the “Keep-Alive Memory” (KAM) framework. Whenever you see a P0603 error code, it implies the engine control module isn’t adequately utilizing the put away data and is rather working on default boundaries.

Definition of P0603 error code

The technical definition of OBD-II generic trouble code P0603 is as an internal control module Keep Alive Memory (KAM) error.

Meaning of the P0603 error code

The P0603 code is explained as that your Powertrain Control Module (PCM) has faced some issues in clearing the Keep Alive Memory (KAM) individual test. The PCM is a computer in your vehicle that controls an assortment of basic frameworks, for example, the start, motor planning, fuel/air combination, transmission, and antilock brakes

At the point when a vehicle is produced, the PCM is customized with plant default settings for that model. Be that as it may, these defaults aren’t generally ideal. Depending upon your vehicle’s characteristics, and climate conditions, and driving propensities, the PCM needs to make changes all together for your vehicle to perform ideally. 


As opposed to making several changes each time you drive, your PCM keeps its settings spared in Keep Alive Memory. By chance that your PCM can’t recover these settings after a few endeavors, it produces a P0603 code.

Symptoms of P0603 error code

Likewise with other error codes that disturb the internal control module; P0603 triggers the Check Engine light, yet additionally other admonition lights on the dashboard. Different side effects of this trouble code include:

  • Vehicle faces Hard starting or no start conditions
  • Vehicle faces Engine stalling
  • Vehicle face Harsh or erratic shifting in transmission
  • Failed fuel efficiency
  • Vehicle faces dying when coming to stop
  • Vehicle faces Misfire-like conditions

Common causes of P0603 error code

There are many causes of the P0603 error code. Some of them are:

  • Corroded battery terminal
  • Loosely connected battery terminal
  • Keep Alive Power (KAPWR) circuit wire complex routing
  • Faults in the Charging system 
  • Faults in Ignition system causing secondary ignition voltage inference
  • KAPWR circuit is wired openly
  • Faults in PCM, internal fault
  • Faults in Internal PCM program 

How to diagnose the P06063 error code?

There are few steps involved in the diagnosis of the P06063 error code, some of them are:

Check the battery of your car

Check the battery’s voltage of your car using a multi-meter. By chance that the voltage is low, plug on the vehicle battery charger and let it charge until it’s full. At that point, reset your codes and hang tight for a couple of long periods of normal and easy driving. If, the code returns, you need to replace the battery or alternator of your vehicle.

Check the battery of your car

In case, that the battery voltage is normal, plug the battery charger. You need to ensure that your battery remains completely charged during the whole procedure of the diagnosis.

Check the contacts and ground connections 

If, in your diagnosis, you realize that your battery itself isn’t the issue. The next step is to visually detect the battery contacts of your vehicle. Search for dampness, erosion, soil, or whatever else that could be making your vehicle cause low voltage. And if you find anything that is reducing the effectiveness of your vehicle, clear it.

For the next step, you need to disconnect your PCM and test all connecting wires with and from the battery. Test the ground associations from your PCM and battery also, to ensure that they’re not shorted, corroded, and damaged. Repair or replace all the damaged wires, reset your codes, and take a test drive to check whether the code returns. 

In case, if you found that this P0603 error code remains and your need to fix this error, then try to repair or replace your PCM. 

How to fix the diagnosed P0603 error code?

Here are basic fixes for this P0603 error code: 

  • Repairing or replacing damaged or corroded connections, parts, or wirings, and ensure all connectors are secured, so that this error does not occur again.
  • Repairing or replacing broken parts in individual control modules 
  • Replace the defective PCM 

Dumb mode and “Limp” mode are two wide different faults that occur in your vehicle. The memory of the PCM does not adapt to the engine parameters as required. The changing values of the programmed values are helpful for better fuel efficiency, smooth starting, no stalling, no hesitation on acceleration, and smooth run of the vehicle.

Most people replace the PCM if they diagnose a P0603 error code, in fact, the primary cause of this error code is the improper voltage supply to the PCM KAM circuit.

If you diagnose that your vehicle is triggered with the P0603 error code, rectify the problem as soon as possible.

Leave a comment

Your email address will not be published. Required fields are marked *