P065B - OBD Trouble Code

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Fault code P065B can be defined as Generator Control Circuit Range/Performance. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

This can happen because of a lot of reasons and the mechanic should diagnose the specific cause for this code.

Want to learn something more about this fault code? If the powertrain control module or one of the other related controllers has detected a low output condition in the generator system, then the P065B trouble code would start appearing. 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 Control Circuit Range/Performance?

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

1. Electronic Control Unit - Do you remember when was the last time you got your car Electronic Control Unit checked up? A dirty Electronic Control Unit can cause a lot of issues like displaying P065B code.
2. Powertrain Control Module - Are there some faults in your Powertrain Control Module? Don’t waste time and get them replaced or else P065B code can turn up.
3. Alternator - OBD Code P065B can appear because of faulty Alternator.
4. Engine Control Module - Everything is fine with Electronic Control Unit and still P065B code triggering? Then you must get your Engine Control Module checked.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P065B code by mentioning some major symptoms below:

Common Symptoms

• Some issues related to engine drivability
• Flashing up of the engine light
• Car engine not starting properly
• Broken electrical accessories

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 P065B:

• The harness of the generator might be opened or shorted. So, you must get it repaired or replaced
• Replace the controller or PCM if found defective
• Correct the faults in the fuse, relay, or fusible link
• If there are some quirks in the generator, then it should be corrected
• Restore the faulty powertrain control module
• Carefully inspect the bad electrical connection in the generator circuit

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

• The first and the foremost thing which should be kept in mind while diagnosing the P065B error code is to keep the battery fully charged and at the same time the generator should be operating properly. 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 P065B. 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 P065B 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 P065B 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.