P2323: Ignition Coil H Secondary Circuit
Do not keep driving
Stop if the engine light is flashing. Ask when the plugs were last changed — a full set of plugs is considerably cheaper than a coil plus the labour to reach it, and worn plugs are the usual reason a coil fails this test.
What this code means
A fault on the high-voltage output side of coil H. The spark plug argument at P2302 applies, and on an eight-cylinder engine it carries extra weight — plugs are replaced as a set, so one cylinder failing this test with high-mileage plugs usually means the set is finished rather than the coil.
Likely causes
Start here
- Worn or fouled spark plugs · easy
- Faulty ignition coil · easy
- Perished or tracking coil boot · easy
Less common
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about P2323.