The P2331 code indicates that the engine control module has detected an unexpectedly high voltage signal in the primary control circuit of ignition coil K. This typically means the circuit is open or the signal is not being pulled to ground as intended.
An internal open circuit or failure within the ignition coil K primary windings.
Broken, frayed, or severed wires in the primary control circuit causing an open connection.
Corroded or loose terminals at the ignition coil connector creating high electrical resistance.
An internal fault in the PCM/ECM ignition driver circuit for coil K.
Rarely. While the PCM is listed as a possible cause, it is far more common for the failure to be in the ignition coil or the wiring harness.
The vehicle can be driven, but the associated cylinder will not fire, leading to poor performance and potential damage to the catalytic converter due to unburned fuel.
No. This code refers to the primary control circuit of the coil, not the spark plug or the secondary ignition path.