P2CE6 code meaning
Particulate Filter Pressure Sensor C Circuit Range/Performance
Powertrain system Generic code P2Cxx codes Check engine light
What P2CE6 means
P2CE6 marks a sensor C reading that is electrically valid but physically wrong. GM's 2025 diesel tables use it for a frozen downstream relative pressure signal: during transients, with engine speed changing faster than 150 rpm/s and fuel and airflow also changing quickly, the signal must move; too little variation (25OBDG04B: 0.14 % or less in 40 of 50 samples) sets a two-trip Type B code. Ford's 2024–25 gasoline filter strategy runs three checks under P2CE6: an offset test after shutdown that fails at an average of 16 to 32 hPa, a rationality test that fails when the reading stays at or above the flow-based expectation for 20 s in total, and a derivative test over 2 s when exhaust flow changes by more than 225 m³/h. Hoses, condensate and drift are more likely than wiring.
P2CE6 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P2CE6
- Warning lamp on
- Particulate filter regenerations triggered too early or too late
- Filter monitoring (missing substrate test) cannot complete
Common causes of P2CE6
- Most likelySensing hose to sensor C kinked, blocked or disconnected
- PossibleCondensate or frozen water in the sensing line
- PossibleSensor C drifted or sluggish
- Less likelyExhaust leak near the measuring point
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
DPF pressure sensor cWiring harnessECM
What each part of P2CE6 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| C | Area: hybrid propulsion. |
| E6 | The exact fault in that area. |
What to do next
- Note P2CE6 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 P2CE6
What does P2CE6 mean?
P2CE6 means "Particulate Filter Pressure Sensor C Circuit Range/Performance". P2CE6 marks a sensor C reading that is electrically valid but physically wrong. It is a generic code, so it means the same on every make.
Is it safe to drive with P2CE6?
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 P2CE6 fail an emissions test?
Yes, it can. P2CE6 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 P2CE6 to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2CE6 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.