P0C4F code meaning
Drive Motor B Position Exceeded Learning Limit
Powertrain system Generic code P0Cxx codes Check engine light
What P0C4F means
P0C4F covers the second traction motor: its resolver offset learn finished, but the angle it produced lies outside what the controller will accept. GM applies the same two tests as for motor A, an absolute correction above 30 degrees or a change of over 10 degrees against the value kept from earlier learns, both checked at key-off with the rotor nearly still and more than 192 V available. The 2011 Volt sets it on one trip as Type A; the 2016 and 2019 Volt tables also say Type A but wait for five key-off cycles with the angle out of range. No bulletin for this code has been published. A large offset jump usually means something mechanical changed, so the check after a motor or sensor job matters most. P0C18 means motor B was never learned.
P0C4F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 8 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C4F
- Malfunction indicator lamp after shutdown cycles
- Reduced propulsion or motor B unavailable
- Unusual noise or shudder under electric drive
Common causes of P0C4F
- Most likelyMotor B resolver stator fitted in a different position after a repair
- PossibleLearn disturbed by a moving rotor or unstable high voltage at key-off
- Less likelyDamaged motor B resolver giving a shifted angle
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 sensorHybrid control module
What each part of P0C4F 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. |
| 4F | The exact fault in that area. |
What to do next
- Note P0C4F 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 P0C4F
What does P0C4F mean?
P0C4F means "Drive Motor B Position Exceeded Learning Limit". P0C4F covers the second traction motor: its resolver offset learn finished, but the angle it produced lies outside what the controller will accept. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C4F?
Drive gently and only to a workshop. With P0C4F the car can go into limp mode (reduced power) to protect itself.
Will P0C4F fail an emissions test?
Yes, it can. P0C4F 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 P0C4F to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P0C4F clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.