What it means
Cylinder 2 pressure sensor signal jumps or drops out intermittently — connector or wiring issue. 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 reports combustion pressure to the engine control module for cylinder-specific monitoring. This code sets when that signal jumps or drops out intermittently, often because vibration or harness movement disrupts a connector or wire.
Common causes
Most likely first.
- Intermittent connector
- Connector with intermittent contact under vibration
- Harness routed against vibrating component
Symptoms
- Check engine light on
- Intermittent rough running or misfire
- Intermittent loss of engine power
- Possible stalling or hard starting
How to diagnose it
- Save freeze-frame data and monitor live cylinder 2 pressure data to identify whether the fault appeared during a particular engine speed, load, or temperature.
- Inspect the cylinder 2 sensor connector for a loose fit, corrosion, moisture, damaged seals, or terminals that have backed out.
- Follow the harness from the cylinder 2 sensor and look for chafing or routing against a vibrating component.
- With live data displayed, gently wiggle the connector and harness to see whether the pressure signal drops out or jumps.
- If the fault persists, test the cylinder 2 sensor wiring and connections for continuity and intermittent opens or shorts according to the manufacturer's specification.
Common fixes
- Secure the harness away from vibrating or rubbing components.
- Clean and dry the connector and restore its seal and firm fit.
- Repair loose, corroded, or damaged terminals at the cylinder 2 sensor connector.
- Repair an intermittent open or short in the cylinder 2 sensor wiring.
- Replace the cylinder 2 pressure sensor if the wiring and connector are sound but its signal remains erratic.
Can I keep driving?
Limit driving until the intermittent fault is found, especially if the engine misfires, loses power, or stalls. A stall can create a traffic hazard, and continued rough running can increase emissions and damage the exhaust system.
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.