Error Code P2505: What It Means & What To Do?

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The trouble code P2505 can be defined as ECM/PCM Power Input Signal. When the ignition switch would be turned "ON", then the battery voltage would be applied from the battery to the powertrain control module (PCM)/engine control module (ECM) through the main relay. There might be some cases where the ignition switch would be turned "OFF", and then the ECM/PCM would be supplied with power through the battery power input line to control the basic operation of the automobile. The ECM/PCM would set this fault code when the ECM/PCM power input would be out of factory specifications.

1. Ignition Coil - The first and the foremost sign of a failing ignition coil is a weak spark. Buy top notch ignition coil from us at economical prices.
2. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
3. Oil Pressure Gauge - The main function of the oil pressure gauge is to make sure that the lubricants reach the areas they need to, including the camshaft, main, and balance shaft bearings. Buy top notch oil pressure gauge from us at economical prices.
4. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
5. Car Battery & Cables - Most of the time the battery cables and connectors are at fault for a particular component not functioning properly. Thus, the battery cable and connector should be checked for and replace in time.
6. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
7. Diagnostic Tools - It is always advisable to use correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in efficient manner. Buy new quality diagnostic tools from us today!

Our main motive is to achieve customer satisfaction as for us our customers are everything and that’s why we will help you to diagnose P2505 code by mentioning some major symptoms below:

Common Symptoms

• The service engine soon light can start lighting up
• The car engine might not start
• The auto engine might start

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 P2505:

• Make sure to mend the faulty wiring harness to the battery or ECM for power supply to the ECM
• It is essential to restore the flawed fuse
• Repair or replace the quirky circuits
• You must fix the defective battery of the car engine
• Rehabilitate the defaults in the battery cables
• The malfunctioning PCM/ECM should be repaired or replaced as per the need

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Here are some steps which you should follow in order to diagnose this fault code:

• This is a general type of error code which is diagnosed with the help of a scanner.
• The mechanic will insert a scanner to diagnostic port of the vehicle and recover the codes and freeze frame data.
• If he happens to find any additional error codes, he has to address them as well.
• Once it is done, he has to reset the vehicle, and then test drive to see if the error code appears.
• If the error code does not return, then there can be an erratic condition.
• Then the mechanic has to check the wires, connectors and other electrical components and quickly replace them if he finds them to be damaged or defective.
• Most of the latest vehicles utilize a PCM/ECM relay in order to supply the PCM with power and ground signals.
• Others use a system which includes a relay as well as a fused wire that comes directly from the ignition switch or battery junction block.
• This type of error code pertains to the voltage supply for the powertrain control module.
• Just keep in mind that the PCM and ECM are generally the same constituent.
• ECM is short for "engine control module." Since the engine control module and the transmission control module are frequently integrated into a single module, the computer that controls them is referred to as the "powertrain control module." Ninety-five percent of late-model vehicles use a powertrain control module (PCM). Voltage is generally supplied to the PCM using a contact relay.
• A contact relay used in automotive applications will normally used between three and five circuits for operation.
• The initial circuit is constant battery voltage.
• This circuit is generally fused and it stays "hot" at all times.
• After that the next circuit is a ground circuit and it is also constant.
• The third circuit will likely be an ignition power circuit which supplies a second supply of battery voltage.
• The contacts inside the relay are closed when the third circuit is activated, which would send power to the PCM.
• A fourth (and fifth) circuit provides the PCM (and other system controllers) with an input signal that reflects relay voltage.
• The PCM and other controllers utilize the input voltage signal to monitor relay voltage and store a trouble code if the signal is unusual.
• This error code can be successfully diagnosed by using several tools.
• A suitable OBD-II scanner and a digital volt/ohmmeter would be helpful in trying to perform a successful diagnosis.
• Gaining access to access a manufacturer's wiring schematic will also prove to be necessary to successfully diagnosing this code. You can always start with a visual inspection of all wiring as well as connectors.
• Make sure to repair or restore the faulty, disconnected, shorted, or corroded wiring, connectors, and components as per the requirement.
• The system should be retested after repairs are completed to ensure success. If all system wiring, connectors, and components appear to be in good working condition, then you should connect the scanner to the diagnostic connector and all the stored codes and freeze frame data should then be recorded.
• This information can prove to be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored.
• Then 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 all the codes have been cleared, then the vehicle should be taken out for a test drive to see if the code returns.
• If the code is not returning immediately, then it would mean that you have an intermittent condition.
• Intermittent conditions can prove to be quite challenging to diagnose and in extreme cases it should be allowed to worsen before a correct diagnosis can even be attempted.
• Start your diagnosis with a visual inspection of the battery cables and battery cable ends.
• Carefully clean or replace cables and ends as per the requirement.
• Just make sure that the battery should be fully charged and then perform a battery load and starting/charging system test.
• Compare your findings with manufacturer's recommendations and then the faulty components should be replaced as per the need.
• If the battery and starting/charging system are in good working condition, then the system fuses and fusible links should be tested.
• The defective components should be replaced and after that retest the system.
• Without a constant supply of battery voltage to the PCM, your vehicle could continue to store trouble codes, stall at idle or under acceleration, or exhibit a no start condition. Then you should continue with a visual inspection of all PCM and PCM relay system circuitry.
• Repair or restore any wiring, electrical connectors, or system components which appear to be defective, shorted, corroded, disconnected or faulty.
• If the code resets, or you are experiencing a no start condition, start by unplugging the PCM relay connector.
• Examine for voltage and ground signals on the right circuits and your findings should be compared with the wiring schematic or as per the specifications set by the manufacturer.
• Probe any circuits that do not coincide with the specifications set by the manufacturer with the digital volt/ohmmeter. Just be sure to disconnect the PCM and other associated control module connectors before testing individual circuits for continuity and resistance.
• Repair open, disconnected, or shorted circuits as per the requirement and retest the system. If all of the circuits in the relay connector are in line with manufacturer's specs and the relay fails to provide an output signal to the PCM, then it would mean that there is some fault in the relay.
• If the service engine soon lamp fails to illuminate when the key is in the key on engine off position, suspect a defective PCM relay. If all system circuits check out, and the PCM relay is providing all necessary power and ground circuits, then it would mean that the PCM is quirky.
• Keep in mind that the PCM replacement would require reprogramming of one or more control modules.

Common Mistakes When Diagnosing The P2505 Code

• A lot of mechanics might unnecessary replace the powertrain control module. Technicians might report that shortcomings in the voltage supply to the powertrain control module relay are more common in late model vehicles than in earlier automobiles which are equipped with the OBD-II systems.