P0351 2004 Toyota Highlander Code - Ignition Coil 1 Primary/Secondary Circuit
Quick Answer
The ignition system on the vehicle uses individual ignition coils for each cylinder. Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0351 2004 Toyota Highlander indicates Ignition Coil 1 Primary/Secondary Circuit.
- Common causes
- Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0351 2004 Toyota Highlander Description
What are the Possible Causes of the DTC P0351 2004 Toyota Highlander?
- Faulty Ignition Coil 1
- Ignition Coil 1 harness is open or shorted
- Ignition Coil 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0351 2004 Toyota Highlander?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0351 2004 Toyota Highlander code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the P0351 2004 Toyota Highlander code?
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Frequently Asked Questions about P0351 2004 Toyota Highlander Code
1. What does the OBDII code P0351 mean on a 2004 Toyota Highlander?
P0351 indicates an issue with the ignition coil circuit for cylinder 1, specifically in the primary or secondary circuit.
2. What are the common symptoms of code P0351 in a 2004 Toyota Highlander?
Symptoms include engine misfires, rough idling, poor acceleration, reduced fuel efficiency, and the Check Engine Light turning on.
3. What causes the P0351 code to appear in a 2004 Toyota Highlander?
Possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a bad spark plug, or a malfunctioning engine control module (ECM).
4. Can I drive my 2004 Toyota Highlander with a P0351 code?
Driving with this code is not recommended as it can cause engine misfires, reduce performance, and potentially damage the catalytic converter over time.
5. How do I diagnose the P0351 code on my 2004 Toyota Highlander?
Diagnose by inspecting the ignition coil, wiring, and connectors for damage. Use a multimeter to check for proper voltage and test the coil and spark plug for functionality.
6. What is the most common fix for P0351 in a 2004 Toyota Highlander?
The most common fix is replacing the faulty ignition coil for cylinder 1. Ensure wiring and connectors are also inspected and repaired as needed.
7. How much does it cost to fix the P0351 code on a 2004 Toyota Highlander?
Replacing an ignition coil typically costs $50–$150 for parts, plus $50–$100 for labor, depending on your location and mechanic.
8. Can a bad spark plug cause the P0351 code in a 2004 Toyota Highlander?
Yes, a worn or damaged spark plug in cylinder 1 can cause ignition coil issues and trigger the P0351 code.
9. How do I prevent the P0351 code from reoccurring in my 2004 Toyota Highlander?
Perform regular maintenance, including spark plug and ignition coil inspections, and replace components as they wear out.
10. Could the P0351 code indicate a problem with the ECM in a 2004 Toyota Highlander?
While rare, a malfunctioning ECM can cause the P0351 code. However, it’s typically the last resort after ruling out ignition coil, spark plug, and wiring issues.
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