What it means
Cylinder 10 pressure sensor below lower plausibility — short to ground. 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 engine controller monitors the electrical signal from the cylinder 10 combustion pressure sensor. This code sets when that signal falls below the expected lower range, commonly because the signal is shorted to ground or the circuit has a poor connection.
Common causes
Most likely first.
- Sensor signal shorted to ground
- Connector pins corroded - high contact resistance
- Harness chafing through insulation
Symptoms
- Check-engine light
- Rough running or misfire
- Reduced engine power
- Poor acceleration
How to diagnose it
- Record freeze-frame data and check live cylinder 10 pressure-sensor data for a signal stuck low.
- Inspect the cylinder 10 sensor connector and harness for chafing, moisture, corrosion, or pushed-back pins.
- Check whether moving the accessible harness changes the low reading, which can reveal an intermittent short or poor contact.
- With the manufacturer’s wiring diagram, test the cylinder 10 signal circuit for a short to ground and check connector contact quality.
- If the wiring and connections pass, test the sensor and its supply and ground circuits to the manufacturer’s specification.
Common fixes
- Repair insulation damage that is shorting the cylinder 10 sensor signal to ground.
- Clean or repair corroded or loose pins at the cylinder 10 sensor connector.
- Repair a fault in the sensor’s supply or ground wiring.
- Replace the cylinder 10 pressure sensor if it fails testing.
Can I keep driving?
Avoid heavy acceleration if the engine is rough or power is reduced, and have the low sensor signal diagnosed soon. Continued misfire or poor combustion can increase emissions and cause further damage.
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.