P2508 - OBD Trouble Code

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The trouble code P2508 can be elucidated as ECM/PCM Power Input Signal High. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made from 1996 up to present. It’s also more common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot, and Volkswagen vehicles. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model, powertrain configuration type, to another.

1. Oil Pressure Gauge - If the oil filter is blocked, then it might cause an oil pressure gauge to read high. Then it is essential to replace the filter and then the oil should also be changed. We have best oil pressure gauge with us.
2. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
3. Ignition Coil - There would be some issues related to engine misfiring when there is a failure in the ignition coils. A vehicle with a faulty ignition coil will also result in vibration when it is idling at a stop sign or light. You can always rely on us as we have best auto parts for our customers.
4. Powertrain Control Module - If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
5. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
6. Car Battery - Battery plays a vital role in powering the various systems of the car. If the starting and charging systems are not working properly, it will affect the transmission system badly. Thus, replace it now. Buy new battery from us today!
7. Diagnostic Tool - Choose from our diagnostic tools collection that will come handy to detect and correct the OBD error code.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The service engine soon light can start lighting up
• Issues in beginning the car engine
• Auto engine stalling

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

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

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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.
• Most often he has to inspect the solenoid itself to see if they are faulty or damaged. Additional error codes that are stored in the vehicle are also addressed. The mechanic performs a continuity test between the PCM and solenoid to check the resistance. If the solenoid or the control modules are not faulty, he will then retune the code and test drive the vehicle.
• On test driving, if the P2508 code does not return soon, he will know that an erratic condition exits. But if the error returns instantaneously, he will check every components of the control module as well as the circuit like connectors, wires, harness, fuses etc for any possible fault. If any component is damaged, he will fix them right away.
• 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 P2508 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.