P0352: Ignition Coil B Primary/Secondary Circuit Malfunction

P0352 means the ECU saw an abnormal voltage pattern on the primary control circuit of ignition coil #2. In plain terms: cylinder 2 isn't getting a reliable spark command, so it misfires.

P0352 is a ignition-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0352 and illuminates the check engine light.

If your vehicle has triggered P0352, you may notice one or more of these symptoms:

• Rough idle with a distinct shake from one cylinder
• Check engine light on, flashing under load if the misfire is active
• Power loss on acceleration, especially above 3,000 RPM
• Fuel economy drop of roughly 10 to 20%
• Cold-start hesitation or stumble that clears once warm
• Occasional stall at idle or when coming to a stop
• Fuel smell from the tailpipe and hot exhaust downstream of the manifold

Here are the most common causes of P0352:

No - address this immediately. You can limp home, but continued driving with a misfiring cylinder dumps raw fuel into the catalytic converter. A new cat runs €400 to €1,500+, versus €30 to €120 for a coil. Don't push it.

Follow these steps to pinpoint the root cause of P0352:

1. Scan for all stored codes and freeze frame data. If P0302 is also present, you've confirmed cylinder 2 is the misfiring one
2. Pull coil #2 and inspect the boot for cracks, carbon tracking, and oil. Check the connector pins for green corrosion or a backed-out terminal
3. Swap coil #2 with coil #1 or #3, clear codes, drive and rescan. If the P0352 becomes P0351 or P0353, the coil is bad
4. If the code stays on cylinder 2, pull spark plug #2. Look for wide gap, oil fouling, cracked insulator, or wrong heat range
5. Measure primary resistance across the coil terminals (typical 0.4 to 2.0 ohms) and secondary if accessible (5k to 15k ohms). Compare to service manual spec, not gut feel
6. Key on, engine off: back-probe the coil connector for switched 12V on the supply pin. Cranking: verify the PCM is pulsing the trigger wire (test light flicker or scope)
7. If supply, ground, trigger, coil, and plug all check out, scope the primary waveform. A missing or flat trigger points to the PCM ignition driver
8. After repair, clear codes and run a drive cycle covering idle, part-throttle, and full-throttle to confirm the misfire counter stays at zero

Repair costs for P0352 vary depending on the root cause and your vehicle. Here are typical estimates:

P0352 behaves differently depending on your vehicle. Select your car below for model-specific causes and known issues:

These codes are often seen alongside P0352 or indicate related issues: