P2301 indicates that the PCM has detected an abnormally high voltage in the primary control circuit of an ignition coil. This typically points to a wiring, connector, or driver issue rather than a failed spark plug or secondary side of the coil.
The wiring between the PCM and the affected ignition coil is shorted to another voltage source, causing the PCM to see a high signal on the primary control line.
An internal short within the ignition coil's primary side can feed voltage back into the control circuit, triggering the high input code.
A bent, corroded, or pushed-back terminal at the coil or PCM connector can create a high-resistance or shorted condition that the PCM interprets as a high circuit fault.
Chafed insulation along the engine harness can allow the coil control wire to contact a power feed or another circuit.
Rarely, an internal failure of the PCM's ignition coil driver circuit can cause an incorrect high-voltage reading. This should only be considered after all wiring and the coil are verified good.
Not necessarily. While a failed coil can cause this code, a short to voltage in the control circuit or a damaged connector is equally common. The coil should be tested, not assumed.
Short distances may be possible, but misfire-related codes can damage the catalytic converter over time and cause poor drivability. Diagnosis should be done promptly.
Usually no. Many drivers are told to replace the PCM, but the vast majority of P2301 cases are caused by wiring, connectors, or the coil itself. The PCM should only be replaced after the circuit and coil are fully verified as good.
No. P2301 is a primary control circuit fault, not a secondary ignition or spark plug code. A worn spark plug may cause a related misfire code, but it will not trigger P2301.