P2325 indicates that the primary control circuit for ignition coil I is reporting a voltage higher than expected. The engine control module monitors the coil driver voltage and sets this code when the signal exceeds the calibrated threshold.
An internal short or open in the coil's primary winding can cause the driver voltage to rise above limits.
Damaged insulation, a broken wire, or a short to power can produce a high voltage reading at the PCM.
High resistance or intermittent contact at the connector can alter the voltage seen by the control module.
A failed driver transistor inside the PCM may output excessive voltage, though this is less common than coil or wiring faults.
An inadequate ground path can cause the driver voltage to appear high to the PCM.
Not usually. The code is most often caused by the ignition coil itself, wiring, or connector problems. PCM failure is a rare cause and should be considered only after other items are ruled out.
Driving with a high primary circuit voltage can lead to misfires, catalyst damage, and reduced performance. It is advisable to diagnose and repair promptly.
Clearing the code only removes the stored fault; the underlying condition will cause the code to return until the root cause is corrected.
No. The coil should be tested first. If the coil passes resistance and functional tests, the fault is likely in the wiring, connector, or ground circuit.