Powertrain, generic (extended)

P2334 Ignition Coil L Primary Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2334, the last primary-side coil code of the series, reports a short to voltage on the coil L trigger line. No manufacturer documents this code publicly; it can only occur on engines with twelve individual coils. GM's comparable cylinder 8 code P2322 shows how such a check works: while the driver is on, the line voltage lies outside the controller's acceptable band, counted as a Type B fault with the MIL after two trips. Typical causes are a coil lead rubbing through onto a supply wire or a coil with internal leakage; on many V12 engines reaching the coils means removing covers or intake parts, which raises the labour time. P2333 is the ground-side counterpart.

Likely causes

Coil L control wire shorted to a voltage source
Coil L internally faulty
Engine module output for coil L defective

Symptoms

  • Check engine light on
  • Cylinder 12 intermittently dead
  • Hardly noticeable loss of smoothness

Repair estimate

DifficultyHardWorkshop job
Parts and labour€60–1,200
Time0.5–5 h

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

Parts involved

ignition coilcoil driverignition wiring

Related codes

P2333P0362P2331P0312

References: law.cornell.edu, gsi.ext.gm.com, en.wikipedia.org.