Powertrain, generic (extended)

P2325 Ignition Coil I Primary Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2325 flags a short to voltage on the trigger line of coil I, the ninth ignition output. Ford is again the only maker that lists it publicly: in its OBD summaries P2325 sits among the codes for a coil driver shorted high, and the 2014 Ford code list shows it as a MIL-lighting code checked with the engine running. The PCM judges current and voltage on the driver against open and short limits; when it trips, it stops fuel to that cylinder to protect the catalyst, waits 30 s and turns the injector back on, repeating the cut within about 0.1 s if the fault is still there. That makes the symptom a pulsing loss of one cylinder rather than a steady miss. On a Ford V10 the cause is mostly the coil or a chafed wire; P2324 is the ground-side fault on the same coil.

Likely causes

Coil I control wire touching a 12 V feed
Coil I primary winding damaged
PCM driver stage for coil I faulty

Symptoms

  • Check engine light on
  • Cylinder 9 drops out in roughly 30 s cycles
  • Uneven idle and vibration

Repair estimate

DifficultyMediumDIY possible
Parts and labour€40–450
Time0.3–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

ignition coilcoil driverignition wiring

Related codes

P2324P0359P2322P2328P0309

References: newtonnet.co.uk, performanceparts.ford.com, fordservicecontent.com.