P063D - OBD Trouble Code

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The fault code P063D can be defined as Generator Voltage Sense Circuit High.

 

The main function of the generator voltage sense circuit is to monitor the alternator and battery voltage during vehicle operation. The output voltage of alternator should be at a level that is capable of compensating for battery draws from electrical components including the starter, lighting and various other accessories. The voltage regulator should also adjust the output to provide sufficient voltage to charge the battery.

The voltage out of the generator is monitored by the powertrain control module. 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.

 

If an improper signal with the generator voltage sense circuit would be detected by the powertrain control module, then the P063D error code would start appearing.

 

What causes this problem with the Generator Voltage Sense Circuit High?

 

• Alternator might be defective
• There can be opened or shorted alternator harness
• Alternator circuit might have poor electrical connection
• Malfunctioning powertrain control module
• Some flaws in the voltage regulator
• Issue of loose or damaged serpentine belt
• Quirks in the serpentine belt tensioner
• The fuse or fuse-able link might be blown out
• Faults in the car battery

1. Car Battery - OBD Code P063D can appear because of faulty Car Battery. So, you must replace it with a brand new one online.
2. Instrument Voltage Regulator - There can be some issues with the Instrument Voltage Regulator due to which you may see P063D code appearing over and over again. Visit us to buy best quality Instrument Voltage Regulator online.
3. Powertrain Control Module - Are you facing some faults in your Powertrain Control Module? Don’t worry and get them replaced or else P063D code can turn up.
4. Engine Control Module - Common cause behind this P063D error code can be some fault in Engine Control Module. So, it will be a good decision to replace them now.
5. Timing Belt - Engine Control Module is perfectly fine but still but having that trouble code P063D flashing? In such a situation your Timing Belt might be faulty. Why don’t you think of getting that replaced?
6. Belt Tensioner Pulley - The P063D code can also arise due to some issues in Belt Tensioner Pulley. So, it is advised to replace them as soon as possible.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P063D here:

 

Common Symptoms

 

• Battery warning lamp can start appearing
• Issues in starting the car engine
• The engine will crank over slower than normal
• Check engine light can start flashing up

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 P063D:

 

• The faulty alternator should be replaced or repaired as per the need
• It is very important to replace the blown fuse or fuse-able link
• You can always clean corrosion from connectors
• Make sure to repair or replace the quirky wiring
• Repair or replace the battery cables or terminals
• The faulty serpentine belt tensioner should be replaced
• Carefully replace the serpentine belt
• Restore the defective battery
• The faulty powertrain control module should be replaced

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

 

Research the technical service bulletins for known issues with the specific vehicle during troubleshooting process for any malfunction. In some circumstances this can save a lot of time in the long run by pointing you in the right direction. After that the next step is to perform a thorough visual inspection to check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burn spots. Then check the connectors and connections for security, corrosion and damaged pins.

 

This process must include all wiring connectors and connections to the battery, alternator, PCM, and the voltage regulator. Some charging system configurations may be more complex including relays, fuse-able links and fuses in some circumstances.

 

The visual inspection should also include the condition of the serpentine belt and the belt tensioner. The belt should be tight with a sight amount of flexibility and the tensioner must move freely and apply the appropriate amount of pressure on the serpentine belt. Based on the vehicle and the charging system configuration a defective or damaged voltage regulator will require an alternator replacement in most circumstances. The advanced steps become very vehicle specific and require the appropriate advanced equipment to perform accurately.

 

These procedures require a digital multimeter and the specific technical references for the vehicle. The ideal tool to use in this situation is a charging system diagnostic device, if available.

 

Voltage requirements will vary based on the specific year and model of the vehicle. The voltage of the battery should be appropriately 12 volts and the alternator output must be higher to compensate for electrical draws and charge the battery as well.

 

The lack of voltage indicates a faulty alternator, voltage regulator or a wiring issue. If the alternator voltage output is in the appropriate range, this is an indication that the battery requires replacement or a wiring issue exists. If there is absence of a power source or ground, continuity testing may be required to check the integrity of the wiring, alternator, voltage regulator and other components.

 

Continuity tests should always be performed with the power removed from the circuit and the normal readings for wiring and connections should be 0 ohms of resistance unless otherwise specified by the technical data. Resistance or no continuity is an indication of quirky wiring that is open or shorted and it should be repaired or replaced as per the requirement.

 

Common Mistakes When Diagnosing The P063D Code

 

• Alternator might start failing
• Defective powertrain control module
• There can be some issues related to the wiring