Cause
Damaged spark plug wire or boot
Insulation broken down so the spark finds an easier path to earth than the plug gap. Worst when damp and under load, when the plug demands most voltage — which is why the classic report is a misfire that appears in wet weather and clears on a dry day.
Typically an easy fix. Often worth checking before paying anyone to look.
Some of these codes mean you should stop driving
15 of the 16 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 (16)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0351 Ignition Coil A Primary Control Circuit/Open Likely for this code Stop driving High
- P0352 Ignition Coil B Primary Control Circuit/Open Likely for this code Stop driving High
- P0353 Ignition Coil C Primary Control Circuit/Open Likely for this code Stop driving High
- P0354 Ignition Coil D Primary Control Circuit/Open Likely for this code Stop driving High
- P0355 Ignition Coil E Primary Control Circuit/Open Likely for this code Stop driving High
- P0356 Ignition Coil F Primary Control Circuit/Open Likely for this code Stop driving High
- P0358 Ignition Coil H Primary Control Circuit/Open Likely for this code Stop driving High
- P0301 Cylinder 1 Misfire Detected Stop driving High
- P0302 Cylinder 2 Misfire Detected Stop driving High
- P0303 Cylinder 3 Misfire Detected Stop driving High
- P0304 Cylinder 4 Misfire Detected Stop driving High
- P0305 Cylinder 5 Misfire Detected Stop driving High
- P0306 Cylinder 6 Misfire Detected Stop driving High
- P0307 Cylinder 7 Misfire Detected Stop driving High
- P0308 Cylinder 8 Misfire Detected Stop driving High
- U0673 Lost Communication With Ion Sense Module Moderate
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.
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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.
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