Ignition

P0352 — Ignition Coil B Circuit Malfunction (Cylinder 2)

Severity: medium Drive with care, to a shop

What P0352 means

P0352 means the engine control module detected a problem in the control circuit of ignition coil B, most often the coil on cylinder 2. Normally the module triggers the coil, which steps up the voltage and fires the spark plug. When the circuit does not behave as expected, the module sets the code and turns on the check engine light.

Symptoms

  • Check Engine Light on
  • Rough or unsteady idle
  • Misfire or hesitation under acceleration
  • Reduced power
  • Hard starting
  • P0302 often set along with it
  • Worse fuel economy

Possible causes

  1. Failed ignition coil on cylinder 2
  2. Damaged or corroded wiring or connector at the coil
  3. Loose connection at the coil or ground
  4. Worn or faulty spark plug on cylinder 2
  5. Faulty coil driver in the PCM (uncommon)

How to diagnose

  1. Scan all codes and freeze frame data, look for P0302 or other misfire codes
  2. Inspect the cylinder 2 coil connector and harness for corrosion, chafing or a loose fit
  3. Swap the coil with another cylinder's coil and see whether the code follows
  4. Remove and inspect the cylinder 2 spark plug for wear, gap, oil or cracks
  5. Check power and ground at the coil connector with a multimeter
  6. Verify the control signal from the PCM and wire continuity back to the module
  7. Measure primary and secondary coil resistance against factory specs

Common fixes

  • Replace the cylinder 2 ignition coil
  • Replace the spark plugs, ideally as a set
  • Repair the wiring or replace the connector
  • Reprogram or replace the PCM if confirmed faulty

P0352 on different brands

Ford · manuals
On 2024-2025 Ford gasoline engines you may see the extended code P0352:11, which points to a short to ground in the coil control circuit; it describes the monitor condition detected, not a confirmed failed part.

Questions and answers

What does P0352 mean?

It is a fault in the ignition coil B circuit, usually on cylinder 2. The control module sees the coil or its wiring not working as expected.

Can I drive with P0352?

Only a short distance to a shop, and gently. Prolonged driving with misfires can ruin the catalytic converter.

How can I quickly test the coil?

Swap it with a neighboring coil. If the code moves to another cylinder (such as P0351 or P0353), the coil is bad; if not, look at the wiring, spark plug or PCM.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.