Error Code P065C: What It Means & What To Do?

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The P065C trouble code can be identified as Generator Mechanical Performance. The generator is controlled by the engine control module by using a generator turn ON signal circuit. A high side driver within the ECM allows the ECM to turn the generator ON and OFF. Now when the generator operation is desired, the ECM sends a 5-volt signal to the voltage regulator via the generator turn on signal circuit. This would cause the voltage regulator to start controlling the generator field circuit.

Willing to learn more about this fault code? Then you have arrived at the right place. There are some cases where the alternator is also known as generator but more frequently this type of code is used in a hybrid or electric vehicle which generates electrical power from a generator.

What causes this problem with the Generator Mechanical Performance?

• Defaults in the controller or PCM
• The fuse, relay, or fusible link might have some flaws
• There can be some faults in the generator
• The harness of the generator might be opened or shorted
• Bad electrical connection in the generator circuit
• Programming error in the powertrain control module

1. Electronic Control Unit - A faulty Electronic Control Unit can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Powertrain Control Module - If everything is alright with Electronic Control Unit, then there is surely some defect in Powertrain Control Module. Get it replaced before the situation gets worse.
3. Engine Control Module - P065C code can display due to some issues in the Engine Control Module. So, it is very important to replace the Engine Control Module with us at equitable prices.
4. Alternator - Do you remember when was the last time you got your car Alternator checked up? A dirty Alternator can cause a lot of issues like displaying P065C code.

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P065C? Your wish is our demand. Have a look at them below:

Common Symptoms

• Issue of delay or no start in the car engine
• Appearance of the engine light
• Electrical accessories might not be functional
• There can be some engine drivability problems

Looking out for some ways with the help of which you can correct this fault code? Then you have arrived at the correct place. We are here to help you out, so you must check out the steps mentioned below as follows:

• If you find out that the harness of the generator is opened or shorted, then it should be repaired properly
• Correct the issue of bad electrical connection in the generator circuit
• Make sure to repair the PCM programming error
• The defective generator should be repaired or replaced
• You can always restore the faulty fuse, relay, or fusible link
• Repair or replace the PCM

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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P065C code to be stored:

• Keep one thing in mind that the car battery is completely charged and at the generator should be functioning properly before you start diagnosing the P065C error code
• Make sure to consult your vehicle information source for technical service bulletins (TSB) that replicate the code stored, vehicle (year, make, model, and engine), and symptoms exhibited
• If you find the appropriate TSB, it may yield helpful diagnostic information. A diagnostic scanner and a digital volt/ohmmeter will be necessary to accurately diagnose a code P065C. A reliable source of vehicle information will also be needed
• You should start by connecting the scanner to the vehicle diagnostic port and retrieving all stored codes and freeze frame data
• You will want to write this information down, just in case the code proves to be an intermittent one. Now once all the pertinent information has been recorded, then you should clear the codes and test drive the vehicle until the code is reset or the PCM enters readiness mode
• If the PCM enters readiness mode, the code is intermittent and will be even more difficult to diagnose. The condition, which caused the P065C to be stored, may need to worsen before an accurate diagnosis can be reached
• On the other hand, if the code fails to reset and there are no drivability symptoms exhibited, the vehicle can be operated normally
• If the P065C is immediately reset, proceed with a visual inspection of system related wiring and connectors. Harnesses that have been broken of unplugged should be repaired or replaced as required
• Once you have the correct information, test all system fuses and relays to make sure the generator is being supplied voltage
• If generator supply voltage is not present, trace the appropriate circuit back to the fuse or relay from which it originates. Repair or replace defective fuses, relays, or fusible links as required
• In some cases, generator supply voltage is routed through the PCM. You may use wiring diagrams and other vehicle specific information to help diagnose generator voltage supply malfunctions
• If generator supply voltage is present, use your DVOM to test generator output performance at the appropriate pin of the generator connector
• If the appropriate level of generator output voltage is not discovered, suspect that the generator is defective

Should the level of voltage at the PCM connector differ (by more than 10-percent) between what is detected at the generator connector, suspect a shorted or open circuit between the two. If you want to avoid the misdiagnosis, then you must test the generator fuses with the circuit loaded