P0351 Toyota Fix: Ignition Coil Issues in Camry/Corolla/RAV4 (2010-2022) | UR800 Guide

RAV4 (2010-2022) | UR800 Guide

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P0351 Toyota: Fix Ignition Coil Issues (2010-2022)

The P0351 code is a common diagnostic trouble code in Toyota vehicles, indicating problems with the Ignition Coil A Primary/Secondary Circuit. This guide focuses on P0351 Toyota issues in popular models like Camry, Corolla, and RAV4. Learn how to diagnose with the iCarzone UR800 and fix ignition system problems efficiently.

1. What Is P0351 in Toyota Vehicles?

P0351 in Toyota vehicles specifically indicates a malfunction in the Ignition Coil A circuit. The Engine Control Module (ECM) detects abnormal voltage or resistance in the coil's primary or secondary windings, preventing proper spark generation. In Toyota's Direct Ignition System (DIS), each cylinder has its own coil, making this a cylinder-specific issue.

Note: In most Toyota models, Coil A corresponds to cylinder 1. For example, P0351 Toyota Camry points directly to the ignition coil for cylinder 1.

2. Causes of Ignition Coil A Issues

Several factors contribute to P0351 in Toyota models:

  • Faulty Ignition Coil: Internal winding damage preventing proper voltage transformation (common in 2016 Toyota Corolla P0351 cases).
  • Wiring Problems: Damaged wires or loose connectors between ECM and coil (prevalent in Toyota RAV4 models with engine bay heat exposure).
  • Corroded Connections: Moisture or corrosion at coil electrical terminals (frequently reported in Toyota Camry P0351 after heavy rain).
  • ECM Issues: Failed driver circuit in the engine control module (rare but documented in 2019 Toyota Corolla).
  • Heat Damage: Coil degradation from excessive engine compartment heat (common in Toyota RAV4 P0351 with high underhood temperatures).

3. Symptoms of P0351 in Toyota Models

P0351 Toyota issues present through these key symptoms:

  • Check Engine Light: Illuminated dashboard warning—primary indicator of ignition coil A problems.
  • Engine Misfire: Noticeable shaking, especially under acceleration in Toyota Camry P0351 models.
  • Reduced Power: Hesitation during acceleration, common in 2018 Toyota RAV4 with this code.
  • Increased Fuel Consumption: 2-4 MPG drop reported by Toyota Corolla owners with P0351.
  • Stalling: Engine shutdown at idle or low speeds (occasional in Toyota Camry with severe coil failure).

4. How Serious Is P0351 in Toyota Cars?

P0351 in Toyota vehicles requires attention as it can lead to:

  • Catalytic converter damage from unburned fuel
  • Secondary misfire codes (P0301) in Toyota Corolla models
  • Engine overheating due to incomplete combustion
  • Costly repairs if left unaddressed in Toyota Camry and RAV4 vehicles

5. Toyota Trends: P0351 by Model & Year

P0351 frequency varies across Toyota models:

  • 2010-2014 Toyota Camry: 38% of cases caused by coil insulation breakdown (Toyota TSB EG016-13 addresses this).
  • 2013-2018 Toyota Corolla: 42% due to wiring harness issues near the coil connectors.
  • 2015-2022 Toyota RAV4: 35% linked to moisture intrusion in coil electrical connections.

6. Can You Drive with P0351 in Your Toyota?

Short-distance driving with P0351 in Toyota is possible but not recommended. Continued operation can cause:

  • Permanent catalytic converter damage
  • Damage to cylinder walls and pistons
  • Complete engine shutdown in severe cases

7. Best Fixes for Toyota P0351

Effective solutions for P0351 Toyota issues:

  • Replace Ignition Coil: Install OEM 90919-C2007 coil for Toyota Camry and Corolla.
  • Repair Wiring: Fix damaged harness with heat-shrink connectors (critical for Toyota RAV4 P0351).
  • Clean Connections: Remove corrosion from coil electrical terminals.
  • ECM Repair: Professional reprogramming if module is faulty (rare in most cases).
  • Prevent Overheating: Ensure proper engine cooling to protect new coil (important for Toyota Corolla).

8. Diagnosing with iCarzone UR800

The iCarzone UR800 simplifies diagnosing P0351 in Toyota vehicles:

  1. Connect UR800 to OBD-II port under Toyota dashboard.
  2. Select "Toyota" > Your model > "2010-2022" from the menu.
  3. Run "Ignition Coil Test" to verify Coil A functionality.
  4. Check "Live Data" for coil voltage and current readings.
  5. Use "Active Tests" to command coil operation and confirm issues.
 Diagnose P0351 with UR800

9. Cost to Repair P0351 in Toyota

Repair costs for P0351 Toyota vary by solution:

  • OEM ignition coil (90919-C2007): $45–$85 per coil
  • Wiring repair: $60–$120 (including labor)
  • Coil replacement labor: $50–$100
  • ECM repair/reprogramming: $200–$400 (if needed)
  • Professional diagnosis: $80–$150

Save on diagnosis costs using the iCarzone UR800 to pinpoint issues accurately.

10. Repair Video for Toyota Owners

Search YouTube tutorial for step-by-step Toyota P0351 repair guidance.

11. Preventive Measures for Coil Health

Prevent P0351 in Toyota with these tips:

  • Inspect ignition coils every 60,000 miles.
  • Replace all coils simultaneously if over 80,000 miles.
  • Ensure proper engine cooling system maintenance.
  • Check coil connections during regular service.
  • Use UR800 monthly to scan for early ignition system issues.

12. Frequently Asked Questions

Can I replace just one ignition coil in my Toyota?

Yes, but if your Toyota Camry or Corolla has over 80,000 miles, consider replacing all coils to prevent future failures.

How long do Toyota ignition coils last?

Typically 80,000–120,000 miles, but can fail earlier in Toyota RAV4 models due to higher underhood temperatures.

Will P0351 cause my Toyota to fail emissions tests?

Yes, the associated misfire usually leads to increased emissions and test failure.

Can a bad spark plug cause P0351?

No, P0351 specifically indicates coil circuit issues, though a bad plug can cause similar symptoms in your Toyota.

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