P0C63 code meaning
Drive Motor B Position Sensor Circuit B Intermittent/Erratic
Powertrain system Generic code P0Cxx codes Check engine light
What P0C63 means
P0C63 is reserved for short-lived dropouts or erratic jumps on Circuit B, the second winding of the motor B resolver, that do not settle into a steady fault. No manufacturer documents this code publicly. The best public illustration comes from GM's 2008 Tahoe and Yukon Hybrid: a weak crimp at the transmission pass-through connector produced intermittent starting with motor B resolver codes, though GM files them under P0C61 and the general P0A45 and P0A46 rather than an intermittent code. That case shows where to look first, crimp joints, pass-through connectors and harness sections near moving parts. Wiggle tests under live data help catch it. P0C59 is the same fault type on Circuit A of motor B.
P0C63 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0C63
- Intermittent warning lamp
- Occasional start problems or short loss of motor B
- Fault not present during a workshop check
Common causes of P0C63
- Most likelyWeak crimp or loose terminal in the motor B S2/S4 path, including pass-through connectors
- PossibleIntermittent wire break near moving powertrain parts
- Less likelyMoisture or corrosion causing unstable contact
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Drive motor b position sensor bWiring harnessHybrid control module
What each part of P0C63 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| C | Area: hybrid propulsion. |
| 63 | The exact fault in that area. |
What to do next
- Note P0C63 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0C63
What does P0C63 mean?
P0C63 means "Drive Motor B Position Sensor Circuit B Intermittent/Erratic". P0C63 is reserved for short-lived dropouts or erratic jumps on Circuit B, the second winding of the motor B resolver, that do not settle into a steady fault. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C63?
Drive gently and only to a workshop. With P0C63 the car can go into limp mode (reduced power) to protect itself.
Will P0C63 fail an emissions test?
Yes, it can. P0C63 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0C63 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0C63 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.