What it means
Cylinder 5 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 5 pressure sensor reports combustion pressure to the engine control module, which checks whether the signal agrees with expected cylinder behavior. This code sets when the signal is within its electrical range but the cylinder 5 pressure reading does not match the module's plausibility or performance checks.
Common causes
Most likely first.
- Sensor drift
- Sensor element aged beyond calibration window
- Sensor mounting loose - signal damping
Symptoms
- Check-engine light
- Rough or uneven engine running
- Misfire or hesitation
- Reduced engine power
How to diagnose it
- Review freeze-frame data and live cylinder 5 pressure readings to see when the plausibility fault occurs and how the reading compares with other cylinders.
- Inspect the cylinder 5 sensor connector and harness for loose fit, corrosion, chafing, or damage that could distort a valid-range signal.
- Check that the sensor is securely mounted and seated as specified, since a loose mounting can damp or alter its pressure response.
- Monitor the cylinder 5 pressure signal during engine operation and compare its behavior with the manufacturer's diagnostic information.
- Test the sensor supply, ground, and signal circuits to rule out wiring faults before judging sensor accuracy.
- If the circuit and mounting pass, test the cylinder 5 pressure sensor against the manufacturer's specification for drift or inaccurate response.
Common fixes
- Secure or correctly refit a loose cylinder 5 pressure sensor mounting.
- Repair a poor connector terminal or damaged cylinder 5 sensor wiring.
- Replace a cylinder 5 pressure sensor confirmed to have drifted or become inaccurate.
- Repair a confirmed fault in the module's cylinder pressure evaluation system.
Can I keep driving?
The engine may run roughly or hesitate if cylinder 5 pressure data is inaccurate, even though the signal remains within its electrical range. Avoid heavy loads if performance is reduced and arrange diagnosis soon to limit emissions and drivability issues.
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.