P2302

Ignition Coil 'A' Secondary Circuit

Q: Is it safe to drive with P2302?

For short distances, but a steady misfire can overheat and damage the catalytic converter — especially with a flashing light. Fix it promptly.

Q: Can I just clear P2302?

It returns within a few drive cycles unless the failing coil, boot, or plug is actually replaced.

Ignition system Generic OBD-II Medium

What it means

P2302 means the ECM detected a fault in the secondary (high-voltage) side of ignition coil 'A' — the part that fires the spark plug. This usually causes a misfire on that cylinder, so the engine runs rough and loses a little power. The typical cause is a failing coil, a cracked boot or plug wire, or a worn spark plug. Repair it promptly, since a sustained misfire can damage the catalytic converter.

Medium

Can I keep driving? Usually yes, but expect a misfire and rough running on that cylinder; sustained misfiring can damage the catalytic converter, so repair it soon.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on, sometimes flashing during a misfire
Rough idle and an intermittent stumble or miss
Hesitation and reduced power on acceleration
Slightly higher fuel consumption

Common causes

Most likely first

Faulty ignition coil 'A' (secondary/high-voltage side)Likely
Cracked or carbon-tracked coil boot or spark-plug wireCommon
Worn or fouled spark plug on that cylinderCommon
Poor connection or damaged wiring at the coilLess often
Failed ECM ignition driver, least likelyLess often

How to diagnose & fix

Work through it in order

Read freeze-frame data and note which cylinder coil 'A' serves.
Inspect the coil boot, plug wire, and spark plug for cracks, carbon tracking, or fouling.
Swap the suspect coil with a neighbouring cylinder and see if the fault follows it.
Check the coil connector and wiring for a poor connection.
Replace the failed coil, boot, or plug, then clear the code and re-test.

FAQ

Quick answers

Is it safe to drive with P2302?+

For short distances, but a steady misfire can overheat and damage the catalytic converter — especially with a flashing light. Fix it promptly.

Can I just clear P2302?+

It returns within a few drive cycles unless the failing coil, boot, or plug is actually replaced.

Read & clear P2302 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX