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P03522018 Model Year TelemetryCritical Severity

P0352 on 2018 Subaru Crosstrek

Ignition Coil B Primary/Secondary Circuit Malfunction

Technical troubleshooting wire for fault code P0352 specifically tailored for the 2018 Subaru Crosstrek. Includes wiring sensor pinouts, freeze frame PID parameters, and step-by-step diagnostic tree.

2018 Engine Control Module (ECM) Specific Calibration
Subaru Crosstrek2018 Crosstrek
2018 Subaru Crosstrek
SUV • 2.0L Boxer-4 (152HP) / 2.5L (182HP) / 2.0L PHEV Plug-In Hybrid (149HP)
2018 Stats
Vehicle
2018 Crosstrek
2.0L Boxer-4 (152HP) / 2.5L (182HP) / 2.0L PHEV Plug-In Hybrid (149HP)
ECU Subsystem
Automotive OBD-II
SAE Mode $01 & $02
Est. Repair Cost
$100 - $350 (DIY: $30 - $90)
OEM Parts & DIY
Urgency Level
Critical
Tow to Shop
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Common 2018 Crosstrek Symptoms

  • Flashing CEL
  • Violent engine shudder
  • Major power loss
  • Accompanied by P0302

Likely Root Causes on 2018 Crosstrek

  • Dead Cylinder 2 ignition coil
  • Damaged harness wiring
  • Loose connector
  • PCM coil driver fault

Step-by-Step Fix Protocol for 2018 Subaru Crosstrek

Step 1: Scan & Record Freeze Frame Data

Connect an OBD-II scanner to the DLC port under the driver dashboard. Record engine RPM, Short Term / Long Term Fuel Trim (STFT/LTFT), and engine coolant temperature at the moment P0352 set.

Step 2: Inspect Wiring Harness & Pin Voltages

Inspect the sensor connector on the 2018 Crosstrek engine bay. Use a multimeter to verify reference voltage (5.0V / 12.0V) and ground continuity.

Step 3: Component Replacement & PCM Reset

Replace the verified defective component using OEM or equivalent grade parts. Clear DTC P0352 and complete an EPA drive cycle to verify readiness monitors set to READY.

Recommended Parts & Testing Tools

Equipment for Diagnosing 2018 Subaru Crosstrek (P0352)

Prime Fast Delivery & Verified Fitment
OEM Ignition Component

Direct-Fit Laser Iridium Spark Plugs (Set of 4/6)

4.8 / 5.0 (Top Rated)

Pre-gapped iridium spark plugs engineered to restore smooth combustion on 2018 Subaru Crosstrek.

$36 – $68 Prime
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Ignition Service Tool

Magnetic Swivel Spark Plug Socket Set

4.8 / 5.0 (Amazon Choice)

360-degree magnetic swivel socket prevents ceramic plug cracks inside deep engine spark wells.

$16.99 Prime
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Top Mobile OBD-II Scanner

BlueDriver Bluetooth Pro OBDII Scan Tool

4.7 / 5.0 (50,000+ Reviews)

Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.

Compare OEM & Aftermarket Replacement Sensors for 2018 Subaru CrosstrekVerified direct-fit pricing from Denso, Bosch, Motorcraft, and ACDelco on Amazon.
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Full Reliability Report2018 Crosstrek ProblemsSafety Recalls2018 Crosstrek RecallsAll Generation YearsCrosstrek P0352 Master Hub