OBD2 Car ScannerWhat does P063B mean?
P063B stands for Generator Voltage Sense Circuit Range/Performance. The engine computer has found a fault in one of its own circuits or in a circuit it controls.
Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Damaged wiring or a loose connector
- Low battery voltage or poor ground
- Faulty relay or actuator
- In rare cases, a faulty engine control module
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does P063B mean?
P063B means “Generator Voltage Sense Circuit Range/Performance”. It belongs to the computer and output circuits group: The engine computer has found a fault in one of its own circuits or in a circuit it controls.
Is it safe to drive with P063B?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear P063B?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- P0637Power Steering Control Circuit High
- P0638Throttle Actuator Control Range/Performance (Bank 1)
- P0639Throttle Actuator Control Range/Performance (Bank 2)
- P063AGenerator Voltage Sense Circuit
- P063CGenerator Voltage Sense Circuit Low
- P063DGenerator Voltage Sense Circuit High
- P063EAuto Configuration Throttle Input Not Present
- P063FAuto Configuration Engine Coolant Temperature Input Not Present
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.