P2364 indicates that the engine control module has detected an abnormal pressure variation for cylinder 11, meaning that cylinder is producing less combustion pressure than the other cylinders. This is usually discovered during a cylinder‑contribution or misfire monitor test and triggers the check‑engine light. The underlying cause can be mechanical, fuel‑related, ignition‑related, or, rarely, a software issue in the PCM.
A defective injector can deliver too little or too much fuel, leading to improper combustion pressure in that cylinder.
A weak or missing spark reduces the combustion energy, causing a drop in cylinder pressure.
Worn piston rings, leaking valves, or a blown head gasket can lower the mechanical compression in cylinder 11.
Unmetered air entering the cylinder creates a lean mixture, which can alter pressure during the power stroke.
Stuck or leaking PCV/EGR valves can introduce too many exhaust gases into the cylinder, diluting the charge and reducing pressure.
The engine computer may misinterpret pressure data, but this is an uncommon cause and should be considered only after all other sources are eliminated.
It signals that the engine computer has detected an abnormal pressure variation for cylinder 11, typically meaning that cylinder is producing less combustion pressure than expected.
No. The engine computer is rarely the cause; the problem is almost always a mechanical, fuel‑system, or ignition issue. Replace the PCM only after all other possible causes have been ruled out.
Driving is not recommended because the underlying misfire can damage the catalytic converter and reduce fuel economy. Have the vehicle diagnosed as soon as possible.
OBD‑II uses the cylinder number based on the engine’s firing order, so the code can appear on any engine that has at least 11 cylinders (for example, a V12). The underlying causes and repair steps are the same regardless of cylinder count.