P063B OBD Error Code: Problem & Solutions

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The fault code P063B is related with the generator voltage sense circuit. If an improper signal with the generator voltage sense circuit would be detected by the powertrain control module, then the P063B fault code would start triggering up. Due to this, the check engine light would start appearing.

The error code P063B can be defined as Generator Voltage Sense Circuit Range/Performance.

Do you want to learn more about the P063B fault code? 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 P063B fault code.

What causes this problem with the Generator Voltage Sense Circuit Range/Performance?

• Alternator might be defective
• There can be opened or shorted alternator harness
• Alternator circuit might have poor electrical connection
• Malfunctioning powertrain control module
• Faults in the voltage regulator
• The serpentine belt might be loose or damaged
• Some defects in the serpentine belt tensioner
• Issue of blown fuse or fuse-able link
• Battery not functioning properly

1. Powertrain Control Module - Do you remember when was the last time you got your car Powertrain Control Module checked up? A dirty Powertrain Control Module can cause a lot of issues like displaying P063B code.
2. Timing Belt - Are there some faults in your Timing Belt? Don’t waste time and get them replaced or else P063B code can turn up.
3. Instrument Voltage Regulator - OBD Code P063B can appear because of faulty Instrument Voltage Regulator.
4. Car Battery - Everything is fine with Instrument Voltage Regulator and still P063B code triggering? Then you must get your Car Battery checked.
5. Engine Control Module - There can be some issues with the Engine Control Module due to which you may see P063B code appearing over and over again. Visit us to buy best quality Engine Control Module online.
6. Belt Tensioner Pulley - A lot of issues can arise do to defective Belt Tensioner Pulley. Did you just see P063B code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P063B code by mentioning some major symptoms below:

Common Symptoms

• Battery warning lamp can start appearing
• Issues in starting the car engine
• The engine might start cranking over slower than normal
• Flashing of the check engine light

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 P063B:

• 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
• The battery cables or terminals should be repaired or replaced properly
• Carefully replace the serpentine belt tensioner
• Replacing the serpentine belt
• The flawed battery should be restored
• Replace the malfunctioning PCM

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

If you want to diagnose the P063B fault code, then you must 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 P063B Code

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