P0352

Ignition Coil B Primary Control Circuit/Open

Ignition / misfire Generic OBD-II High

What it means

P0352 means the engine control module detected an open or fault in the primary control circuit for ignition coil B. That coil fires the spark plug on its cylinder; when its circuit is open the cylinder misfires, so the engine runs rough, loses power, and can stall. Sustained misfiring also risks overheating the catalytic converter, so it's worth fixing quickly.

High

Can I keep driving? Not for long — a dead coil means a cylinder isn't firing, so the engine runs rough and can damage the catalytic converter. Drive as little as possible.

Real-world scan data

Seen in

2,086

scans in the past year

Found in

0.3%

of scans

0.6%

of scans that found faults

Appears alongside · share of P0352 scans

P0351in 64.0% of scans

P0353in 53.1% of scans

P0302in 31.0% of scans

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 (may flash during an active misfire)
Noticeable misfire, shaking, or rough idle
Reduced power and hesitation on acceleration
Possible stalling and increased fuel consumption

Common causes

Most likely first

Failed ignition coil B (the most common cause)Likely
Open, damaged, or corroded wiring/connector at the coilCommon
Open in the coil's primary control (driver) circuit to the ECM/ignition moduleCommon
Faulty coil-driver output in the ECM (less common)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and identify which cylinder coil 'B' serves on your engine.
Inspect the coil's connector and wiring for damage, corrosion, or an open.
Swap coil B with a known-good coil from another cylinder to confirm the coil itself.
Check the primary control circuit for continuity back to the ECM.
Replace the failed coil (and spark plug if worn), then clear and re-test.

FAQ

Quick answers

Is it safe to drive with P0352?+

No, not for long. A misfiring cylinder dumps raw fuel into the exhaust and can overheat and ruin the catalytic converter, especially if the light is flashing.

Can I just clear P0352?+

It returns within a drive cycle because the coil circuit is still open — the coil or its wiring has to be repaired.

Read & clear P0352 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