P0352 on Subaru
Ignition Coil B Primary/Secondary Circuit Malfunction
P0352 on Subaru vehicles indicates ignition coil b primary/secondary circuit malfunction. Au7o has documented this code across 1 Subaru model — most commonly on Forester. This is an ignition/engine code. Each ignition coil takes the car's low battery voltage and steps it up into the high-voltage spark that fires a spark plug. P0352 means the engine computer detected a problem in the primary or secondary circuit of ignition coil 'B' — it isn't getting the proper electrical signal back when the coil is commanded to fire. This often causes a misfire, rough running, hesitation or reduced power, and if left unaddressed can lead to unburned fuel damaging the catalytic converter. Typical repair costs on Subaru range from $60 to $350, depending on the specific model and root cause.
Common Causes of P0352
- •Failed ignition coil 'B'
- •Damaged wiring or corroded connector at the coil
- •Open or short in the coil primary/secondary circuit
- •Worn or fouled spark plug increasing coil stress
- •Poor power or ground supply to the coil
- •Faulty ignition control circuit/driver in the ECM (less common)
P0352 on Subaru by Model
Subaru Forester(1 issue)
- Ignition Coil Failure Causing Misfire and Hard Cold-Weather Starting2009-2022
Coil-on-plug ignition coils on the Forester are a common failure point. As the coil's internal epoxy/resin cracks with heat and age, the coil produces erratic or insufficient spark, causing single-cylinder misfires, rough idle, hesitation on acceleration, reduced fuel economy and a flashing/steady check-engine light. A frequently reported pattern is hard starting or stumbling when cold (below roughly 10°F) that improves once the engine warms. Note that a leaking spark plug tube seal (oil in the plug well) can prematurely kill a coil, so the two issues often appear together.
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View P0352 across all makes →Frequently Asked Questions
What does P0352 mean on Subaru?▼
P0352 stands for "Ignition Coil B Primary/Secondary Circuit Malfunction." This is an ignition/engine code. Each ignition coil takes the car's low battery voltage and steps it up into the high-voltage spark that fires a spark plug. P0352 means the engine computer detected a problem in the primary or secondary circuit of ignition coil 'B' — it isn't getting the proper electrical signal back when the coil is commanded to fire. This often causes a misfire, rough running, hesitation or reduced power, and if left unaddressed can lead to unburned fuel damaging the catalytic converter. On Subaru specifically, this code is documented across 1 model.
What causes P0352 on Subaru vehicles?▼
Common causes on Subaru: Failed ignition coil 'B', Damaged wiring or corroded connector at the coil, Open or short in the coil primary/secondary circuit, Worn or fouled spark plug increasing coil stress, Poor power or ground supply to the coil. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0352 on a Subaru?▼
Repair costs on Subaru range from $60 to $350, depending on the specific model and root cause.
Which Subaru models have P0352 documented?▼
Au7o has documented P0352 on 1 Subaru model: Forester.