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.


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.

Trouble Code

P0725 Code: Engine Speed Input Circuit

These days, almost all cars have an on-board diagnosis system that helps to diagnose different error code in our automobile. It is known to everyone that diagnosis of error code and repair is not an easy task. Fortunately, the car’s booklet and the defined steps make that process easier. If your vehicle is diagnosed with error code P0725, it is a sign that there are some faults in your vehicle’s sensor. This error can be generated when there is some mechanical or electrical problem in the vehicle.

Error code P0725 definition

The error code P0725 can be defined as Engine Speed Input Circuit that signifies that there are some faults in the engine speed input sensor signal of the vehicle.

What does the error code P0725 mean?

This error code generates when OBD-II notices some faults with the sensors of your vehicle. The primary function of the engine speed input circuit is to send signals about the relative speed of the engine to the powertrain control module. The PCM then determines the proper shift strategy, which is then sent to the transmission case.


When the PCM is unable to recognize an accurate signal from the input speed sensor for a specific time frame, then the Error Code P0725 is triggered, and the Check Engine light is illuminated.
Inappropriate engine speed input signal can be the result of different issues such as excessive voltages, voltage lacking and PCM may enter into the limp-in mode.

Possible cause of the error code P0725

There are many possible causes of the error code P0725, some of them are:

  • Faults in engine speed input sensor or transmission output speed sensor
  • Faults or worn out engine speed sensor reluctor ring
  • Corroded magnetic tip of the sensor in question
  • The problem in Open or shorted wiring or connectors in the engine speed input circuit
  • The problem in Mechanical transmission that results in transmission or clutch slippage
  • Faults in the crankshaft of the engine
  • Possibly data network issues

Possible symptoms of the error code P0725

You may notice the following symptoms when your vehicle is diagnosed with this error code:

  • Erratic or inoperative tachometer
  • Erratic Shifting of the Automatic transmissions (limp-in mode)
  • Check engine light illuminates
  • Faults id Odometer/ speedometer
  • Harsh Transmission slippage
  • MIL lights on for 10 seconds.

When this error code is detected?

The P0725 error code is detected when there are faults in sensors and because of that TCM fails to receive engine speed input signals from ECM.

The severity of the Error code P0725

This error code can cause faults in transmission and sensors. This can be dangerous and can affect the safety of the vehicle. So you should not ignore this error code and should visit a mechanic.

How to diagnose the error code P0725?

If your vehicle is diagnosed with this error code (P0725), you need to visit a professional immediately. They will scan your vehicle using the OBD-II scanner tool and look for freeze frame data. They will search for any other trouble code that leads to this problem.


Then they will reset the trouble code, restart the vehicle, and take a short drive to check if the code returns. If they do not detect the code, the code is generated mistakenly.
In case, code return after being reset, the mechanic will then go through the wires, connectors, transmission fluids, open circuits, and many other issues. When some issues are found and resolved, they will reset again the code to check whether it returns.

How to fix the P0725 error code?

Depending on the diagnosis of the vehicles, these repairs can fix the error code:

  • Repair the faults of the input speed sensor or output speed sensor
  • Repair the faults wires or connectors
  • Repair the faults of the transmission fluid
  • Repair faults of the PCM (rare)

Every error code causes a different effect on a different vehicle. These repair methods do not fit all vehicles, so it is advisable to visit the professional as quickly as possible.

Trouble Code

P0496 Code: EVAP Flow During a Non-Purge Condition

These days most vehicles have – board diagnostic system that helps to diagnose several errors of the vehicles. Using the scanning tool, you can detect the specific error codes that are causing problems in your vehicle. If your vehicle is experiencing OBD-II scanned error code P0496, it means that the flow in the EVAP system in your vehicle is at the wrong time. It does not affect the safety of your vehicle but can cause damages to various components if left unattended.

Meaning of the P0496 error code

P0496 code specifies that the EVAP flows during a non-purge condition and it means that there is some defect in the fuel or emission system. Purge flow is the last destination of the product where the fuel emission is emitted from the charcoal canister and flows towards the engine for burning. During this process, if the unplanned vacuum is generated, then the system triggers the P0496 error code.

Elaboration of the EVAP system

The EVAP plays a crucial part in the car that helps to prevents fuel vapors to escape in the atmosphere. Regulators and car manufacturers try to lower down the fuel emission of the vehicle and thus help to improve fuel efficiency.
Gasoline is the automobile’s fuel that evaporates quickly. If there is leakage in your engine hydrocarbon leaks even when your engine is turned off. These emitted compounds create pollution when they react with the outside air.


The P0496 error code is generated when your system detects some faults in the purge flow of the EVAP system. This indicates that the purging solenoid valve has failed the periodic test that is done by the engine to check its working capacity.
The evaporative control system reports to the Powertrain Control Module by sending diagnostic data on regular basis, as the computer performs several performance tests on the EVAP system and then processes further. If any defect is detected with the EVAP system then the PCM will report all issues with the computer and check engine light illuminates.

Possible causes of P0496 error code

The primary reason the P0496 error code is failed purges. But, there can be a lot of possible causes for this code to happen. Some of them are:

  • Defects in purge
  • Defects in vent solenoid/valve
  • Error in EVAP canister
  • Damages in EVAP or fuel pressure sensor
  • Faults in electrical connection
  • Defects in canister purge valve
  • Blockages in vapor canister
  • Defects in vent solenoid
  • Leakages in EVAP system hose (not every but in specified cars)
  • Shorting in the electrical circuit

Symptoms of P0496 error code

There are various symptoms of the P0496 error code, but they are hard to notice. EVAP is a closed system and it is difficult to spot faults by hearing the purge flow issues. Here are some signs that indicate there are P0496 error codes in your vehicle:

  • Check engine light illuminates.
  • The car faces trouble starting
  • Car is running rich in idle condition
  • Issues in catalytic convertor

The severity of the P0496 error code

The OBD-II P0496 error code is not as severe as other error codes, but you need to solve this error as soon as possible. This may cause problems while turning on the engine; this can affect the efficiency of the engine.
Some time due to this error, your car runs rich, and this can adversely damage the engine of the vehicle. The mileage of the car also gets affected by this trouble code.

How to diagnose the P01496 error code?

When your car is creating some faults while running, you take your car to the mechanics; they diagnose the P0496 error code by the following method:
They diagnose the error code using the OBD-II scanner tool and seal the EVAP system using the seal function of the engine. They note down the fuel tank pressure sensor readings with the off purging. If they found the mismatch readings set by the manufacturers, then it indicates that there are some faults in the purge solenoid valve.


For repairing the purge solenoid valve, they blow into it, and if air goes through it, then it is clear that it has some faults, so it needs replacements.
If air does not pass through the purge valves, it indicates that the problem could be solved. This also indicates there may be some issue with the fuel tank pressure sensor. To inspect the fuel tank pressure sensor, a scanning tool is used to monitor the pressure of the tank with the removed gas cap. If there is a vacuum in the sensor without the gas cap, it is clear that there is a problem with the fuel tank pressure sensor.

How to fix this P0496 error code?

If you diagnose that your vehicle is triggered with the P0496 error code, then to get rid of this error you need to repair the valve or replace the purge solenoid valve with the proper specifications.
If any issue present in your vehicle, do not ignore them. Take your vehicle to the mechanic and properly deal with the issues and make your vehicle run in good condition