What it means
Cylinder 2 pressure sensor reads in range but plausibility check fails. 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
The cylinder 2 pressure sensor measures combustion pressure, and the control module checks whether its signal follows a plausible pressure pattern. This code sets when the reading remains within the electrical range but does not behave as expected, such as when sensor drift or a loose mounting dampens the signal.
Common causes
Most likely first.
- Sensor drift
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Check engine light on
- Rough running or misfire
- Reduced engine power
- Hard starting
How to diagnose it
- Use a scan tool to record freeze-frame data and compare cylinder 2 pressure readings with other cylinders under the same conditions.
- Watch the cylinder 2 live pressure signal as engine speed and load change to see whether it responds plausibly.
- Inspect the cylinder 2 sensor mounting and connector for looseness, contamination, corrosion, or damaged pins.
- Check the cylinder 2 harness for chafing or poor connections that could distort the reading despite an in-range signal.
- Compare sensor response and mounting condition with the manufacturer's specification before replacing parts.
Common fixes
- Secure the cylinder 2 pressure sensor if its mounting is loose.
- Clean and reconnect the cylinder 2 sensor connector if contact is poor.
- Repair damaged cylinder 2 wiring or connector terminals.
- Replace the cylinder 2 pressure sensor if its in-range signal fails plausibility checks.
Can I keep driving?
If the engine runs normally, a short, gentle drive may be possible, but avoid heavy loads if it misfires or loses power. An implausible cylinder 2 reading can impair combustion control and lead to rough running or hard starting.
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.