What it means
A general electrical fault on the cylinder 10 combustion pressure sensor — used on engines with closed-loop combustion control (e.g. some Volvo and BMW direct-injection diesels) to measure cylinder pressure directly via a sensor at the glow plug or injector position.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
On engines equipped with combustion pressure sensing, a sensor associated with cylinder 10 reports pressure information to the engine controller. This code sets when the cylinder 10 pressure sensor circuit has a general electrical fault, so the controller cannot reliably use that signal to assess combustion.
Common causes
Most likely first.
- Faulty cylinder 10 pressure sensor
- Open or damaged sensor wiring
- Loose or corroded connector
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 missing, fixed, or implausible reading.
- Locate the cylinder 10 pressure sensor connection and inspect its plug, pins, and nearby harness for looseness, corrosion, or damage.
- Check the sensor wiring for opens or shorts using the vehicle maker’s circuit diagram and test procedure.
- Verify the sensor’s supply and ground circuits against the manufacturer’s specification.
- If wiring and connections pass, test the cylinder 10 pressure sensor according to the manufacturer’s procedure.
Common fixes
- Reconnect or clean a loose or corroded cylinder 10 sensor connector, as appropriate.
- Repair damaged or open wiring in the cylinder 10 pressure-sensor circuit.
- Replace a cylinder 10 pressure sensor that fails testing.
Can I keep driving?
If the engine is rough or down on power, avoid heavy loads and have the fault checked soon; the controller may have limited combustion feedback for cylinder 10. Stop driving if the misfire becomes severe.
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.