Error Code P063A: What It Means & What To Do?

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The trouble code P063A can be defined as Generator Voltage Sense Circuit. The voltage out of the generator is monitored by the powertrain control module. If the alternator output voltage would be less than the battery feed circuit voltage, then the powertrain control module would set up the P063A fault code.

Want to learn something more about this fault code?

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.

What causes this problem with the Generator Voltage Sense Circuit?

• There can be some faults in the alternator
• Alternator harness might be opened or shorted
• Poor electrical connection in the alternator circuit
• Defaults in the 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. Timing Belt - A faulty Timing Belt can be troublesome. You can always rely on us as we have best auto parts for our customers.
2. Car Battery - If everything is alright with PCM, then there is surely some defect in Car Battery. Get it replaced before the situation gets worse.
3. Instrument Voltage Regulator - P063A code can display due to some issues in the Instrument Voltage Regulator. So, it is very important to replace the Instrument Voltage Regulator with us at equitable prices.
4. Belt Tensioner Pulley - Do you remember when was the last time you got your car Belt Tensioner Pulley checked up? A defective Belt Tensioner Pulley can cause a lot of issues like displaying P063A code.
5. Powertrain Control Module - Poor Powertrain Control Module can cause a lot of difficulties, so why not get it replaced at time?
6. Engine Control Module - OBD Code P063A can appear because of faulty Engine Control Module.

There could be countless symptoms which that would accompany with this fault code. Willing to know some common symptoms of OBD Trouble Code P063A? Your wish is our demand. Have a look at them below:

Common Symptoms

• Illumination in the battery warning lamp
• The engine will not start
• The engine will crank over slower than normal
• Check engine light can start flashing up

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:

• It is very important to replace the defective alternator
• You can always replace the blown fuse or fuse-able link
• Make sure to clean the corrosion from connectors
• Repairing or replacing 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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It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P063A code to be stored:

• The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSBs) for the specific vehicle by year, model and power plant. 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 P063A Code

• Failure in the alternator failure
• Some wiring issues
• There can be some defects in the powertrain control module