P227E code meaning
Barometric Pressure Sensor C Circuit Intermittent/Erratic
Powertrain system Generic code P22xx codes Check engine light
What P227E means
P227E covers a sensor C signal that jumps although every single value is in range. GM measures this as a string length: the absolute difference between each reading and the one taken 12.5 ms earlier is summed over 80 consecutive readings, and a sum above 152 kPa (2018 diesel) or 150 kPa (supercharged LT4) counts as a failure. Four failures in five one-second samples set the code, as Type B with two trips on the diesel and as Type A on the LT4. Loose terminals, chafed insulation, a cracked sensor housing or interference from nearby actuators are typical triggers. P227C and P227D catch steady shorts, P227B values that are smooth but wrong. The engine normally keeps running on a substitute pressure.
P227E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P227E
- MIL on, possibly coming and going
- Occasional brief hesitation or uneven boost
Common causes of P227E
- Most likelyLoose or corroded terminals in the sensor C connector
- PossibleChafed wiring with intermittent contact
- Less likelyInterference from ignition or actuator wiring routed nearby
- Less likelySensor C with an unstable internal element
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Barometric pressure sensorSensor wiring
What each part of P227E means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 2 | Area: fuel and air metering (injector circuit). |
| 7E | The exact fault in that area. |
What to do next
- Note P227E 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 P227E
What does P227E mean?
P227E means "Barometric Pressure Sensor C Circuit Intermittent/Erratic". P227E covers a sensor C signal that jumps although every single value is in range. It is a generic code, so it means the same on every make.
Is it safe to drive with P227E?
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 P227E fail an emissions test?
Yes, it can. P227E 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 P227E to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P227E clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.