P0352 code meaning
Ignition Coil B Primary Control Circuit/Open
Powertrain system Generic code P03xx codes Check engine light
What P0352 means
Modern engines have one coil-on-plug ignition coil per cylinder, with the output stage either in the engine module or in the coil itself. P0352 monitors the primary control circuit of coil B – the line from the engine module to the coil or its built-in output stage – for an open circuit or high resistance. GM's module measures the voltage with its low-side driver off and flags an open circuit above 30 kΩ in 50 of 63 samples (2018 engines in the first trip, older ones after two); Ford checks continuously within 1 s, expecting a primary-current feedback for every ignition command, and shuts off injection to that cylinder for 30 s at a time. Short circuits and the secondary side have their own codes (P2300 ff). Coil B usually serves cylinder 2, but the assignment is up to the manufacturer.
P0352 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0352
- Check engine light on
- Misfire and rough running on cylinder 2, often also P0302
- Loss of power, jerking under load
- Cylinder shut off (injection off), risk to the catalyst if driven on
Common causes of P0352
- Most likelyIgnition coil B faulty (output stage in the coil or primary winding open)
- Most likelyConnector at the coil corroded, loose or with a spread pin
- PossibleControl, supply or ground wire open or chafed
- Less likelyFuse or relay of the coil supply (then usually several codes)
- Less likelyDriver in the engine module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Ignition coil bIgnition wiringEngine control module
What each part of P0352 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 3 | Area: ignition system or misfire. |
| 52 | The exact fault in that area. |
What to do next
- Note P0352 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0352
What does P0352 mean?
P0352 means "Ignition Coil B Primary Control Circuit/Open". Modern engines have one coil-on-plug ignition coil per cylinder, with the output stage either in the engine module or in the coil itself. It is a generic code, so it means the same on every make.
Is it safe to drive with P0352?
Drive gently and only to a workshop. With P0352 the car can go into limp mode (reduced power) to protect itself.
Will P0352 fail an emissions test?
Yes, it can. P0352 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0352 to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0352 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.