P2504 - OBD Trouble Code

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The trouble code P2504 can be described as Charging System Voltage High. This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model. This would also give rise to the illumination of the check engine light.

1. Generator Assembly - Thinking of starting your car with faulty generator assembly? The car won’t be able to start because the bad generator assembly won’t charge the car battery when the automobile was running.
2. Electronic Control Unit - ECU monitors the temperature differences in the boost converter with the help of the temperature sensors to prevent the converter from overheating and malfunctioning. Thus, replace faulty ECU immediately.
3. Engine Control Module - ECM failures and faults can be very difficult to find and resolve as these are very rare and might require a complete reprogramming of the system to avoid wrong codes from getting stored in the system, leading to misdiagnosis. Replace it now!
4. Car Battery - The car battery can also be at fault and might have the problem of overcharging and fast discharging. This can cause increased temperatures and can also affect the functioning of various sensors like the speed sensor, temperature sensor and many more. Thus, replace faulty car battery today!
5. Powertrain Control Module - Faulty PCM can disrupt the normal functioning of the vehicle by affecting the transmission system and the fuel delivery system. This will cause the system to store wrong OBD error and thus can lead to misdiagnosis.
6. Diagnostic Tool - In order to be that DIY guy, you need few diagnostic tools to get your car problems pointed out easily. Our diagnostic tools collection will come handy to do so, so why not have a look?

We care for our customers and that’s why we can totally understand your problem. That’s the reason why we have listed out some major symptoms behind the flashing up of OBD Code P2504. They are mentioned here as follows:

Common Symptoms

• Check engine light can start flashing up
• Issues in starting the car engine
• Car engine might stall
• The engine might stall when on idle
• The overall fuel efficiency might start declining
• Unacceptable shifting in a vehicle with an automatic transmission
• Illumination in the red battery light

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P2504:

• You must fix the defective powertrain control module
• It is essential to restore the flawed alternator
• The malfunctioning voltage regulator should be repaired or replaced as per the need
• Carefully remove the corrosion from the battery connections
• The battery cables or terminal ends should be restored to working order
• Adjust the flawed wiring or connectors that are associated with this system

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Do you wish to diagnose P2504 error code easily? Here are some steps which you should follow in order to diagnose this fault code:

• The mechanic or the technician will use a diagnostic scanner or code reader like DVOM to visually scan for the error codes in the vehicle.

• After performing a careful inspection, every of the stored codes and freeze frame data are retrieved as it can help down the way for further diagnosis process.
• The powertrain control module monitors the starting/charging system whenever the key is placed in the "ON" position, as is the generator lamp circuit for the instrument panel. When the engine is running, the PCM is programmed to anticipate between 13.8 and 14.4 volts from the charging system.
• If a voltage reading that either exceeds or underachievers, a code will be stored and there would be an appearance of the service engine soon light. There are some automobile models (especially Chrysler) which also use the PCM to regulate charging system voltage.
• System voltage malfunctions related to the PCM are much more common in automobiles equipped with this type of system than in other systems. Before you start with your diagnosis, just make sure that the battery is fully charged.
• If the battery fails to take or hold a charge, then it should be replaced. Several tools will be instrumental in successfully diagnosing this code.
• Use an OBD-II scanner in order to verify that the code is present, and check for other codes for any other type of error or problem that might need attention. The current data along with freeze frame data are recorded, and the codes are then cleared to see if they reoccur.
• Start with a visual inspection of all wiring and connectors Make sure to repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as per the need. Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, then you should connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data.
• This information can prove to be very helpful in diagnosing intermittent conditions that may have contributed to this code being stored. You should continue by clearing the code and operating the vehicle to see if it returns. This will help to decide whether or not the malfunction is intermittent. Now once the codes have been fully cleared, then you should test drive the vehicle to see if the code returns.
• If the code fails to immediately return, then you might have an intermittent condition. Intermittent conditions can prove to be quite challenging to diagnose and in extreme cases they should be allowed to worsen before a correct diagnosis can be made. Continue with a visual inspection of the battery and battery cables. If you find a lot of corrosion on the battery terminals, then it would indicate a poor battery connection.
• If this is the case, disconnect the battery cables from the battery (always disconnect the ground cable first and see manufacturer's recommendations for disconnecting/reconnecting the battery) and remove the corrosion from the battery posts and terminals
• The battery should be reconnected and retest the charging system. Carefully connect the starting/charging system tester to the battery and perform a load test. If the battery fails the load test, then you must replace it.
• Now if the battery passes the load test, leave the tester connected and then start your car engine. Observe the voltage readings on the tester and compare your findings with manufacturer's specifications.
• Replace starting/charging system components as per the requirement. Typical alternator output should read approximately 14 volts with the engine started and no accessories or lighting turned on. Leave the tester connected and utilize the amp probe to test the starter current draw.
• Compare your findings to manufacturer's specs and repair or restore starting system cables or other components as per the requirement. The generator lamp circuit is used to activate a charging system indicator in the instrument panel if system voltage is unusual. Voltage readings that are too low may indicate worn brushes in the alternator. High voltage readings may be indicative of a defective voltage regulator.
• Before performing any continuity and resistance testing on the generator lamp circuit, be sure to disconnect the wiring from the instrument panel to prevent damage to system controllers and circuit boards
• You can always the vehicle service manual for reference voltage readings and other precautions. If the starting/charging system are in good working condition, then there would a need to inspect the test secondary wiring.
• Disconnect the alternator connector and then test all circuits using the digital volt/ohmmeter. If alternator wiring values are in line with acceptable specifications, disconnect the PCM connector and perform a continuity test on all system circuits. Compare actual findings with manufacturer's specifications and repair open or shorted electrical wiring as per the requirement. If the malfunction has still not been rectified, then it would mean that the powertrain control module is quirky.

Common Mistakes When Diagnosing The P2504 Code

• Mistake of not verifying the existence of the P2504 fault code.
• Failing to check the alternator and unnecessarily replacing the battery or starter.
• Failing to thoroughly check the alternator, battery and related charging system constituents.
• Forgetting to clear the P2504 OBD-II fault code after making the required repairs.