What does code P2309 mean?

Q: What does code P2309 mean?

Ignition Coil 'D' Primary Control Circuit Low. P2309 means the engine computer has detected that the primary control circuit for ignition coil 'D' is drawing abnormally low current or showing a short to ground, so it cannot fire that coil reliably. The powertrain control module (PCM) monitors the coil driver circuit and flags this code when the commanded dwell produces a current profile outside the expected range.

DTC codes / P23xx · Ignition system and misfire / P2309

P2309Ignition Coil 'D' Primary Control Circuit Low

P2309 means the engine computer has detected that the primary control circuit for ignition coil 'D' is drawing abnormally low current or showing a short to ground, so it cannot fire that coil reliably. The powertrain control module (PCM) monitors the coil driver circuit and flags this code when the commanded dwell produces a current profile outside the expected range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.