Cause
Perished or tracking coil boot
The rubber boot insulating a coil's output where it meets the plug. When it hardens, the spark tracks down the outside to earth instead of jumping the gap — leaving a visible grey trail — and it costs a fraction of the coil that gets replaced for it. Worse when damp and under load.
Typically an easy fix. Often worth checking before paying anyone to look.
Some of these codes mean you should stop driving
13 of the 13 codes this can cause indicate a fault where continuing to drive risks damage or is unsafe. Which one you have matters more than the cause does — read the code's own page before deciding.
Codes this can cause (13)
Codes where this is a likely explanation first, rather than merely a possible one.
- P2302 Ignition Coil A Secondary Circuit Likely for this code Stop driving High
- P2305 Ignition Coil B Secondary Circuit Likely for this code Stop driving High
- P2308 Ignition Coil C Secondary Circuit Likely for this code Stop driving High
- P2314 Ignition Coil E Secondary Circuit Likely for this code Stop driving High
- P2317 Ignition Coil F Secondary Circuit Likely for this code Stop driving High
- P2320 Ignition Coil G Secondary Circuit Likely for this code Stop driving High
- P2323 Ignition Coil H Secondary Circuit Likely for this code Stop driving High
- P2326 Ignition Coil I Secondary Circuit Likely for this code Stop driving High
- P2329 Ignition Coil J Secondary Circuit Likely for this code Stop driving High
- P2332 Ignition Coil K Secondary Circuit Likely for this code Stop driving High
- P2335 Ignition Coil L Secondary Circuit Likely for this code Stop driving High
- P2306 Ignition Coil C Primary Control Circuit Low Stop driving High
- P2311 Ignition Coil D Secondary Circuit Stop driving High
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.
Others who found this
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 Perished or tracking coil boot.