P0350
Fix within a few daysIgnition Coil Primary/Secondary Circuit Malfunction
Code P0350 means the engine computer detected an issue with an ignition coil circuit. Common causes: Faulty ignition coil (70%), wiring/connector issues (25%). Drivability: Limit driving, fix within a few days. Repair cost: $50-$200 DIY, $150-$500 professional.
Can I Drive With P0350?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration
Stop driving immediately if: Flashing Check Engine Light, loud engine noises, burning smell, significant power loss, or engine stalling.
Symptoms of P0350
- 1Check Engine Light is on (solid or flashing)
- 2Engine misfires or runs rough
- 3Reduced engine power or acceleration
- 4Engine idles poorly or stalls
- 5Engine hesitates during acceleration
Common Causes of P0350
Parts most likely causing this code, ranked by probability
A faulty ignition coil cannot properly generate or deliver spark to the spark plug.
70% of P0350 cases are fixed by replacing the faulty ignition coil(s)
Damaged, corroded, or loose wiring or connectors to the ignition coils prevent proper electrical signal.
25% of P0350 cases are fixed by repairing or replacing wiring/connectors
A rare internal fault in the engine computer can incorrectly interpret or fail to send signals to the coils.
5% of P0350 cases are fixed by replacing the ECM/PCM
Check These First (Before Buying Parts)
- Check for any other related misfire codes (P0300, P0301-P0308, P0351-P0358).
- Visually inspect all ignition coil connectors and wiring for any signs of damage, corrosion, or looseness.
- Ensure the battery terminals are clean and tight.
How to Diagnose P0350
- 1Check for other related misfire codes (P0300, P0301-P0308, P0351-P0358) as these will pinpoint a specific cylinder.
- 2Visually inspect all ignition coil connectors and wiring for damage, corrosion, or looseness.
- 3If no specific cylinder misfire code is present, use a scan tool to monitor misfire counts for all cylinders.
- 4Test the resistance of the primary and secondary circuits of each ignition coil using a multimeter (refer to service manual specifications).
- 5Check for proper power and ground at the ignition coil connectors with the key on.
- 6Swap ignition coils between cylinders to see if the fault moves (if a specific cylinder misfire is suspected).
P0350 on Popular Vehicles
Toyota Camry
2007-2024P0350 on these models frequently indicates a failing individual ignition coil. It's common for one coil to go bad, leading to a specific misfire code (P030X) alongside or shortly after P0350.
70% fixed by replacing the faulty ignition coil
Honda Accord
2003-2024Similar to Toyota, Honda Accords often experience individual ignition coil failures that trigger P0350. Inspecting for oil in the spark plug tubes (from a leaking valve cover gasket) can also be a contributing factor to coil failure.
65% fixed by replacing the faulty ignition coil, 15% by wiring repair
Ford F-150
2004-2024On Ford F-150s, P0350 can be a general indicator of an ignition system issue. While coils are common, wiring harness issues, especially due to heat or vibration, are also a significant factor. Look for chafed wires near the coils.
60% fixed by replacing the faulty ignition coil, 30% by wiring repair
Frequently Asked Questions
What does P0350 mean?
P0350 indicates the engine computer has detected a problem with the primary or secondary circuit of one or more ignition coils. This means the computer isn't seeing the correct electrical signal needed to fire the spark plugs.
Can I drive with P0350?
Limit driving, fix within a few days. If the Check Engine Light is flashing, stop driving immediately to prevent serious damage to your catalytic converter. If it's solid, you can drive short distances, but expect reduced power and rough running.
Will P0350 clear itself?
No, P0350 will not clear itself. The underlying electrical fault or component failure needs to be repaired. The code will remain stored until the issue is fixed and the code is cleared with a scan tool, or after several drive cycles without the fault recurring.
How do I fix P0350 myself?
Start by visually inspecting all ignition coil connectors and wiring. If you find a specific misfire code (P030X), swap that coil with another cylinder's coil to see if the misfire moves. If it does, replace the faulty ignition coil. If no specific misfire, you'll need to test the coils and wiring with a multimeter.
How much does it cost to fix P0350?
DIY costs range from $50-$200 for one or more ignition coils. Professional repair costs typically range from $150-$500, including parts and labor.
P0350 keeps coming back - why?
If P0350 returns, it often means the initial diagnosis missed the true cause. This could be due to a faulty wiring harness, a poor connection that wasn't fully repaired, or a rare issue with the engine control module (ECM/PCM) itself. Ensure all connections are clean and secure.
Will P0350 fail emissions/smog test?
Yes, P0350 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions, and misfires increase harmful emissions.
What's the difference between P0350 and P0300?
P0350 specifically points to an electrical problem within an ignition coil's primary or secondary circuit. P0300 indicates a general random or multiple cylinder misfire, which could be caused by ignition, fuel, or compression issues, including a faulty ignition coil. P0350 is more specific to the coil's electrical function.
P0350 on Honda Accord?
On Honda Accords, P0350 often points to a failing individual ignition coil, especially on models with individual coil-on-plug designs. It's common for one coil to fail, leading to a misfire. Inspecting for oil in the spark plug tubes from a leaking valve cover gasket can also be a contributing factor to coil failure.
Questions to Ask Your Mechanic
Did you check the power and ground at each ignition coil connector, and did you test the resistance of the coils?
Good answer: Yes, I confirmed proper voltage and ground at the coil connectors. I also tested the primary and secondary resistance of each coil and found [Cylinder X coil] to be out of spec. I also checked the wiring for any breaks or corrosion.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$500
Save $100-$300 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - Requires basic hand tools, an OBD-II scanner, and a multimeter for proper diagnosis. Some electrical testing knowledge is helpful.
Cost of Waiting
Continued misfires send unburned fuel into your exhaust system, which can severely damage your catalytic converter. A $50-$100 ignition coil replacement now prevents a $800-$2,500 catalytic converter replacement later.
While You're In There...
Spark plugs and ignition coils work together and often wear out around the same time. Replacing both ensures optimal ignition and prevents repeat labor.
Improves electrical connection, prevents corrosion, and makes future removal easier.
Tools You'll Need
- OBD-II scan tool
- Multimeter
- Socket set (for coil bolts)
- Spark plug socket (if replacing plugs)
- Dielectric grease
- Wire brush (for cleaning connectors)
P0350 is a common ignition system code. Most repairs involve replacing a faulty ignition coil, which is a straightforward fix that will get your engine running smoothly again.
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Your Next Steps
Step 1: Scan for additional codes. Use an OBD-II scanner to check for any other misfire codes (P030X) or specific coil circuit codes (P035X). These will help pinpoint the exact cylinder.
Step 2: Visual Inspection. Carefully inspect the wiring harness and connectors for all ignition coils. Look for frayed wires, corrosion, or loose connections. Repair any damage found.
Step 3: Test and Replace. If a specific cylinder misfire is identified, swap that ignition coil with a known good one from another cylinder. If the misfire moves, replace the faulty ignition coil. If no specific misfire, test each coil's resistance with a multimeter and replace any that are out of specification.