P2337 indicates that the engine control module has detected excessive vibration from the cylinder 2 knock sensor, exceeding its calibrated threshold. The sensor monitors combustion events and reports abnormal knock or detonation conditions.
The sensor element or its internal circuit has failed, producing erratic voltage signals that exceed the vibration threshold.
Corroded pins, broken wires, or poor grounding can cause intermittent or high‑frequency noise that triggers the code.
Worn piston rings, carbon buildup, detonation, or a misfire in cylinder 2 can create real knock events that the sensor correctly reports.
If the sensor was installed with an incorrect gap to the engine block or not torqued to spec, it may read false vibration levels.
Rarely, a malfunctioning ECM can misinterpret sensor signals; this is considered only after all sensor and wiring checks have been exhausted.
No. Replacing the PCM is rarely the solution for this code; the sensor or its circuit is the usual culprit. PCM replacement should only be considered after confirming the sensor and wiring are functional.
Cleaning a contaminated sensor may help if oil or debris is causing false readings, but the sensor should be tested after cleaning to ensure it meets specification.
The knock sensor is designed to detect abnormal, sustained knock. Occasional light pinging under heavy load may not set the code, but persistent or severe knock will.
Start with a wiring inspection; if the wiring is sound, test the sensor itself. Replace only the component that fails the diagnostic tests.