P0352 Code: Ignition Coil B Circuit Malfunction – Diagnose & Fix with ICARZONE UR1000

October 09, 2025

Table of Contents 1. What is P0352? 2. Common Causes in European & American Vehicles 3. Key Symptoms 4. Models Prone to P0352 (Ford, Chevy, VW) 5. Diagnostic Steps with ICARZONE UR1000 6. Fixes & Execution 7. Repair Costs & Safety Tips 8. Preventive Maintenance 9. Frequently Asked Questions 10. Summary

Diagnostic Guide

P0352: Ignition Coil B Primary/Secondary Circuit Malfunction

Solve P0352 in Ford, Chevrolet, and Volkswagen models. Learn causes, symptoms, and fixes using the ICARZONE UR1000 diagnostic tool.

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P0352

1. What is P0352?

P0352 is a DTC indicating a malfunction in the Ignition Coil “B” Primary/Secondary Circuit. The ignition coil converts battery voltage into high-voltage sparks for the spark plugs. P0352 signals that the ECM has detected an abnormal circuit voltage in Coil B (often cylinder #2).

This malfunction can lead to misfires, rough idle, and poor engine performance. Modern engines rely on precise coil operation for efficiency and emissions compliance.

Impact on European & American Vehicles

Ford, Chevrolet, and Volkswagen models use coil-on-plug designs. A failed coil or wiring issue may trigger misfire counters, fuel enrichment, and emissions warnings. Timely repair prevents catalytic converter damage and keeps engines within EPA or Euro 6 emissions limits.

Note: Turbocharged engines, like Ford EcoBoost and VW TSI, are particularly sensitive—misfires can occur immediately if P0352 persists.

2. Common Causes in European & American Vehicles

P0352 can stem from multiple sources. Real-world cases include:

Failed Ignition Coil (Ford Escape 1.5L EcoBoost) — UR1000 live voltage readings showed open coil circuit; replacing OEM coil #BL3Z-12029-AA resolved misfire.
Damaged Wiring or Connector (Chevrolet Equinox 1.5L Turbo) — Chafed wires between ECM and coil caused intermittent P0352; heat-resistant wiring fixed issue.
Corroded Connector (Volkswagen Tiguan 2.0T TSI) — Water intrusion raised resistance; cleaned with dielectric grease and replaced connector, clearing code.
ECM Software Glitch — Certain Malibu 1.5L models misreported coil voltage; UR1000 TSB lookup recommended ECM calibration update (GM v14.0).

3. Key Symptoms

Check Engine Light illuminated with P0352 stored in ECM
Rough idle, cylinder misfire codes (P0302)
Reduced power and acceleration
Fuel consumption increases (up to 10–15% reported)
Difficulty passing emissions tests

4. Models Prone to P0352

Ford: 2017–2023 Escape 1.5L EcoBoost, 2018–2022 F-150 3.5L EcoBoost
Chevrolet: 2018–2023 Equinox 1.5L Turbo, 2020–2023 Malibu 1.5L
Volkswagen: 2018–2023 Tiguan 2.0T TSI, 2019–2023 Jetta 1.4T

Relevant TSBs: Ford 21-2289, GM 23-NA-089, VW 20G012.

5. Diagnostic Steps with UR1000

Step	Action	Goal	Pass/Fail
1	Scan system for DTCs	Identify P0352 and related misfire codes	Pass: Only P0352 \| Fail: Multiple coil/misfire codes
2	Live Data: Coil B primary/secondary voltage	Check proper voltage spike during crank/start	Pass: 0.3–1.5Ω primary, 5–20kΩ secondary \| Fail: Open/short
3	Resistance check & connector inspection	Identify corrosion or wiring faults	Pass: Normal resistance, clean connector \| Fail: >50% deviation
4	Swap Coil B with Coil A (if applicable)	Verify if code follows coil	Pass: No code after swap → wiring issue \| Fail: Code follows coil → replace coil
5	ECM update check	Ensure latest calibration installed	Pass: Updated \| Fail: Update required

6. Fixes & Execution

Replace faulty ignition coil with OEM part
Repair or replace damaged wiring harness and connectors
Clean and apply dielectric grease to connectors
Update ECM software if misreporting coil fault
Test drive after repair to ensure code clearance and no misfire

7. Repair Costs & Safety Tips

Ignition Coil Replacement: $80–$200 per coil
Wiring harness repair: $50–$150
ECM software update: $0–$50 (dealer or UR1000 optional)
Total labor: $60–$120 depending on model
Always disconnect battery before coil replacement
Verify spark plug condition while servicing coil

8. Preventive Maintenance

Inspect ignition coils every 20,000 miles
Check wiring harness for heat damage, corrosion, or wear
Replace spark plugs per manufacturer interval
Keep engine bay dry and clean to prevent water intrusion
Use ICARZONE UR1000 periodically to read live data and detect early coil issues

9. Frequently Asked Questions

Can I drive with P0352? Short-term driving is possible but may cause misfires, reduced power, and catalytic converter damage. Prompt repair recommended.

Will replacing the coil fix all misfires? Only if the misfire originates from Coil B. Check wiring, connectors, and ECM if the code persists.

Is aftermarket coil acceptable? OEM coils recommended for proper voltage and ECM communication. High-quality aftermarket coils may work but verify specs.

Does UR1000 help fix P0352? Yes, UR1000 provides DTC scan, live voltage data, coil test, and ECM info for accurate diagnosis.

10. Summary

P0352 indicates Ignition Coil B primary/secondary circuit malfunction. Key steps: scan codes, live data analysis, inspect wiring/connectors, replace faulty coil, and verify ECM calibration. European & American vehicles including Ford, Chevy, and VW are commonly affected. Use ICARZONE UR1000 for accurate, safe, and fast diagnosis.