What it means
Barometric sensor C signal jumps or drops out intermittently. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Barometric pressure sensor C reports atmospheric pressure to the control module. P227E sets when the sensor C signal changes erratically or drops out intermittently, often because a connector or harness connection loses contact with vibration.
Common causes
Most likely first.
- Intermittent connector
- Connector with intermittent contact under vibration
- Harness routed against vibrating component
Symptoms
- Check-engine light may illuminate intermittently
- Possible intermittent hesitation or reduced power
- Usually no obvious symptoms between signal dropouts
How to diagnose it
- Review freeze-frame data and live readings for sensor C, watching for sudden jumps or dropouts rather than a consistently high or low value.
- Inspect sensor C's connector and harness for loose or corroded terminals, pin push-back, chafing, water entry, and routing against vibrating parts.
- Monitor sensor C live data while gently moving the connector and harness to reproduce the intermittent fault.
- Check sensor C's signal, supply, and ground circuits for intermittent opens or poor connections using the wiring diagram and manufacturer's specification.
- If the circuit remains stable during testing, evaluate sensor C itself against the manufacturer's specification.
Common fixes
- Secure the sensor C connector and correct harness routing that lets it vibrate or rub.
- Clean or repair terminals with intermittent contact.
- Repair damaged wiring where movement causes sensor C's signal to drop out.
- Replace sensor C if its output remains erratic with a verified, stable circuit.
Can I keep driving?
If the vehicle runs normally between dropouts, limit driving to short trips and avoid situations where intermittent hesitation could be hazardous. Stop if power loss or stalling occurs, since the fault can return unexpectedly.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.