Powertrain, generic (extended)

P2326 Ignition Coil I Secondary Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2326 would report a fault in the high-voltage output of coil I – coil, boot or plug of the ninth cylinder. No manufacturer documents this code publicly. FCA's ion-sensing secondary codes, the closest analogue, end at coil 8 (P2323), and Ford, the one maker with public coil I codes, monitors that coil only on its driver side (P2324/P2325). A system that set P2326 would have to judge spark quality on the plug, for example via ion current as in Saab's Direct Ignition, or via secondary voltage. In practice, a weak spark on a ten- or twelve-cylinder engine shows up through misfire detection, which CARB's OBD II rules require for every cylinder: expect P0309. Check plug, boot and coil on cylinder 9 first if the code ever appears.

Likely causes

Spark plug on cylinder 9 worn or bridged
Coil I boot perforated or oil-soaked
Coil I secondary winding weak

Symptoms

  • Check engine light on
  • Misfire on cylinder 9 (P0309)
  • Hesitation under heavy load

Repair estimate

DifficultyMediumDIY possible
Parts and labour€25–500
Time0.3–2.5 h

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

Parts involved

ignition coilspark plug

Related codes

P2324P2325P2329P0359P0309

References: law.cornell.edu, static.nhtsa.gov, en.wikipedia.org.