P2361: Cylinder 11 Pressure Too Low

What it means

Cylinder 11 measured peak combustion pressure is below the calibrated minimum — typically low compression, weak injection, or stuck-open exhaust valve.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The control module uses cylinder 11's pressure measurement to assess how well that cylinder compresses and burns its charge. This code sets when cylinder 11's measured peak combustion pressure is below the calibrated minimum, which can result from low compression, a valve problem, or insufficient injector delivery.

Common causes

Most likely first.

1. Low compression in cylinder 11
2. Leaking or sticking valves
3. Worn piston rings or cylinder wear
4. Cylinder 11 injector delivering too little fuel

Symptoms

• Check-engine light
• Rough running or misfire
• Reduced engine power
• Poor acceleration

How to diagnose it

1. Record freeze-frame data and compare cylinder 11 pressure and misfire information with the other cylinders.
2. Check cylinder 11's injector connector and inspect for signs of leakage or damage that could affect fuel delivery.
3. Review cylinder 11 pressure-sensor data and inspect its sensor mounting and wiring for faults that could cause a falsely low reading.
4. Test cylinder 11 injector operation and compare its delivery with the other cylinders using the manufacturer's procedure.
5. If the low pressure reading is confirmed, perform compression and leak-down checks to assess the cylinder 11 valves, rings, and sealing.

Common fixes

• Repair a loose or damaged cylinder 11 injector connection.
• Correct a confirmed cylinder 11 injector delivery fault.
• Repair a leaking or sticking cylinder 11 valve.
• Repair cylinder 11 compression loss caused by worn rings or cylinder damage.

Can I keep driving?

Avoid heavy loads and long trips if the engine is rough or down on power. Continued low pressure can worsen the misfire and emissions; stop if the engine runs severely rough.