OBD
P2309
Ignition Coil D Primary Control Circuit Low
What it means
P2309 means Ignition Coil D Primary Control Circuit Low.
Check these first
- An ignition coil D primary control wire shorted to ground
- A failed ignition coil D
- An open coil D ground circuit
- Corrosion at the coil D connector
What to do next
- Check for spark at the cylinder fed by coil D
- Test the coil D primary control wire for a short to ground
- Check the coil D ground circuit
- Measure ignition coil D primary resistance
- Replace ignition coil D if the circuit tests good
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.