Ignition and misfires code
P0352: Ignition coil B circuit problem
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $30 | $120 |
| Labor: 0.4 to 1.2 hours × $125 to $175 an hour | $50 | $210 |
| Fees: shop supplies, disposal, diagnostics | $0 | $15 |
| Total, rounded | $80 | $350 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in Boston, $31.54 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
This is the range for the most common fix, ignition coil replacement (one coil). Which repair your car needs depends on a proper diagnosis.
The computer switches coil B on and off to fire a spark plug and checks the circuit for the expected response. This time it saw an electrical fault. Coil B is the second coil in the engine's arrangement, so that cylinder may misfire until the coil or wiring is repaired.
- Safe to drive?
- Short trips only
- Most common cause
- Failed ignition coil
Steady light means you can drive gently to a shop. A flashing light means pull over, since unburned fuel can melt the catalytic converter.
What you may notice
- Rough idle
- Shaking under acceleration
- Lower fuel economy
- Check-engine light
Common causes, most likely first
- Failed ignition coil
- Loose coil connector
- Worn spark plug
- Wiring fault
Check this first
Swap coil B with another coil and clear the code. If the code moves with the coil, replace it. If it stays, check the connector for looseness and the wire for damage, since the problem may be in the wiring.
Other repairs that sometimes fix P0352
| Repair | Typical range, Boston |
|---|---|
| Spark plug replacement | $95 to $580 |
| Diagnostic scan (check engine light) | $60 to $290 |
Before you pay
- Ask the shop what test showed this part is the cause, not just that the code appeared.
- Ask for parts and labor listed separately, and for the hours.
- Ask for a written OK before any extra work. Massachusetts rules require written authorization before repairs.
Got a quote already? Check it against the range. Want to see if your car has a recall tied to this problem? Check recalls by VIN.
Need to read a code yourself? OBD-II scanners on eBay (affiliate link, disclosure).
P0352 questions
Which cylinder is coil B?
It depends on the engine, since manufacturers label coils differently. A shop can confirm with a scan tool or a repair diagram, which show which cylinder the coil serves on your car.
Can I only replace one coil?
Yes, though some shops suggest changing plugs at the same time, because worn plugs make coils work harder and shorten their life. Ask what the plugs look like before agreeing to either.
Why do coils fail?
Heat, age and worn spark plugs all contribute. Coils sit near a hot engine and vibrate for years, and a plug with a wide gap makes the coil push harder to jump it, which wears it out.
How much does it cost to fix P0352?
The most common fix, ignition coil replacement (one coil), has a typical range of $80 to $350 in Boston. It is an estimate built from parts prices and local labor wages, not a quote. Your car and shop change it.
Related codes
- P0351: Ignition coil A circuit problem
- P0302: Cylinder 2 misfire
- P0300: Random or multiple cylinder misfires
More ignition and misfires codes
Code meaning written in our own words. Some codes mean different things on different makes, so check your scan tool or manual. Not a repair shop, estimates only.