Code P2326 indicates that the powertrain control module (PCM) has detected a fault in the secondary circuit of ignition coil 'I'. The secondary circuit includes the coil's high-voltage output, spark plug wire (if applicable), and spark plug. This code is typically set when the PCM senses an open, short, or abnormal resistance in that circuit.
The ignition coil itself may have an internal open or short in the secondary winding, causing high resistance or no spark output.
A spark plug with excessive gap, carbon fouling, or internal damage can create an open or high-resistance condition in the secondary circuit.
Cracks, burns, or corrosion in the wire or boot can cause arcing or an open circuit, preventing proper spark delivery.
Loose, corroded, or pushed-back terminals at the coil connector or spark plug boot can increase resistance or cause intermittent contact.
Wiring between the PCM and ignition coil, or within the coil harness, may be damaged, shorted to ground, or broken.
The powertrain control module may have an internal fault in the ignition coil driver circuit, but this is the least likely cause and should only be considered after all other possibilities are ruled out.
Driving with a misfire can damage the catalytic converter and cause poor performance. It is best to diagnose and repair the issue promptly.
Almost never. The PCM is often misdiagnosed for this code. The problem is usually a faulty ignition coil, spark plug, or wiring. Only replace the PCM after a thorough diagnosis rules out all other causes.
The secondary circuit is the high-voltage side of the coil that delivers spark to the spark plug. It includes the coil's secondary winding, the spark plug wire (if equipped), and the spark plug itself.