P0C9E code meaning
14 Volt Power Module Current Sensor B Circuit Low
Powertrain system Generic code P0Cxx codes Check engine light
What P0C9E means
P0C9E is set when current sensor B of the 14 V power module reads too little. GM documents it for the eAssist accessory power module in its 2013 table 13OBDG05C: the APM output current measured by the sensor must stay below 2 A for 1.5 s, counted as 60 of 80 samples at 25 ms, with the vehicle in run/crank; the code is Type B, so the MIL comes on after the second failing trip. Since an operating converter feeds considerably more current to the 12 V side, such a reading points to an open signal path, a grounded signal line or a dead sensor. The input-side counterpart is P0A88, the high fault P0C9F. Without valid current data the system may restrict the converter, and the 12 V battery can run down.
P0C9E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0C9E
- Check-engine lamp after two drives
- Low 12 V voltage, flickering lights or warning messages
Common causes of P0C9E
- Most likelyOutput current sensor B failed inside the module
- PossibleSensor signal open or shorted to ground
- Less likelyConverter not delivering output although enabled
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pm14v current sensor bWiring harnessDcdc converter
What each part of P0C9E 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. |
| 9E | The exact fault in that area. |
What to do next
- Note P0C9E 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 P0C9E
What does P0C9E mean?
P0C9E means "14 Volt Power Module Current Sensor B Circuit Low". P0C9E is set when current sensor B of the 14 V power module reads too little. It is a generic code, so it means the same on every make.
Is it safe to drive with P0C9E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0C9E fail an emissions test?
Yes, it can. P0C9E 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 P0C9E to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0C9E 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.