P0359
Fix within a few daysThe engine computer (PCM) has detected a problem with the primary or secondary circuit of the ignition coil for cylinder 9.
Code P0359 means your engine's cylinder 9 ignition coil circuit has a problem. Common causes: Bad ignition coil (70%), wiring issues (20%). Drivability: Limit driving, fix within a few days. Repair cost: $50-$200 DIY, $150-$500 professional.
Can I Drive With P0359?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration. Expect reduced performance.
Stop driving immediately if: Flashing Check Engine Light, loud banging noises from the engine, strong rotten egg smell from the exhaust, significant power loss, or engine stalling.
Symptoms of P0359
- 1Check Engine Light is on or flashing
- 2Engine misfires or runs rough
- 3Reduced engine power or acceleration
- 4Engine idles poorly or shakes
- 5Poor fuel economy
- 6Engine may stall
Common Causes of P0359
Parts most likely causing this code, ranked by probability
The ignition coil itself has failed internally, preventing it from generating the necessary spark for cylinder 9.
70% of P0359 cases are fixed by replacing this part
Damaged, corroded, or loose wiring or connector pins to the cylinder 9 ignition coil prevent proper electrical signal flow.
20% of P0359 cases are fixed by repairing wiring or connector
A fouled, worn, or damaged spark plug in cylinder 9 can cause the ignition coil to work harder and eventually fail, or create a misfire that triggers the coil circuit code.
5% of P0359 cases are fixed by replacing this part
A rare internal fault within the PCM's ignition coil driver circuit for cylinder 9 can cause this code.
5% of P0359 cases are fixed by replacing this part
Check These First (Before Buying Parts)
- Visually inspect the ignition coil and its electrical connector for cylinder 9. Look for any cracks, burn marks, or loose wires.
- Ensure the connector is fully seated and free of corrosion.
- Swap the ignition coil from cylinder 9 with a coil from an adjacent cylinder. If the misfire code (P0309) or coil circuit code (P035X) moves to the new cylinder, the coil is faulty.
How to Diagnose P0359
- 1Visually inspect the ignition coil and connector for cylinder 9 for any obvious damage, corrosion, or loose connections.
- 2Swap the ignition coil from cylinder 9 with a known good coil from another cylinder (e.g., cylinder 1). If the code moves to the new cylinder (e.g., P0351), the coil is bad.
- 3If the code does not move, check the resistance of the ignition coil's primary and secondary circuits using a multimeter, comparing to manufacturer specifications.
- 4Inspect the spark plug for cylinder 9 for fouling, wear, or damage. Replace if necessary.
- 5Using a multimeter, check for proper voltage and ground signals at the ignition coil connector for cylinder 9 with the engine running or cranking.
- 6If all other components check out, a professional diagnosis of the PCM may be required.
P0359 on Popular Vehicles
Ford F-150
2004-2024Ford F-150s with V8 engines are prone to ignition coil failures, leading to P0359. The coils are exposed to engine heat and vibration. Replacing the coil pack for cylinder 9 is a common fix.
75% fixed by replacing the ignition coil
Chevrolet Silverado
2007-2024Chevrolet Silverado V8 engines can also experience P0359 due to ignition coil failure. The coil-on-plug design makes replacement relatively simple. Always check the wiring harness for rodent damage or corrosion.
70% fixed by replacing the ignition coil
Toyota Tundra
2007-2024Toyota Tundra V8 models can trigger P0359. While less common than on domestic trucks, ignition coil failure is still the primary suspect. Inspect the coil boot for cracks and ensure the spark plug is in good condition.
65% fixed by replacing the ignition coil
Frequently Asked Questions
What does P0359 mean?
P0359 indicates that the engine's computer has detected an electrical fault in the primary or secondary circuit of the ignition coil responsible for cylinder 9. This means the coil isn't firing correctly.
Can I drive with P0359?
Limit driving, fix within a few days. If the Check Engine Light is flashing, stop driving immediately. A flashing light indicates a severe misfire that is actively damaging your catalytic converter. If the light is solid, you can drive for essential short trips, but expect reduced power and fuel economy.
Will P0359 clear itself?
No, P0359 will not clear itself. This code signifies a hard fault in the ignition system. The underlying issue, such as a bad ignition coil or wiring problem, must be repaired before the code will clear. Even if the light goes off temporarily, the problem is still present and will return.
How do I fix P0359 myself?
Start by visually inspecting the ignition coil and its connector for cylinder 9. If no obvious issues, swap the cylinder 9 coil with a coil from another cylinder. If the misfire moves, replace the faulty ignition coil. If it doesn't move, check the spark plug for cylinder 9 and inspect the wiring to the coil for damage or corrosion.
How much does it cost to fix P0359?
DIY repair costs for P0359 typically range from $50 to $200, primarily for a new ignition coil and possibly a spark plug. Professional repair at a shop will cost between $150 and $500, including parts and labor for diagnosis and replacement.
P0359 keeps coming back - why?
If P0359 keeps returning, it means the root cause was not fully addressed. Common reasons include: a faulty new ignition coil, an underlying wiring issue that was missed, a bad spark plug stressing the new coil, or a rare PCM fault. Ensure all connections are clean and secure.
Will P0359 fail emissions/smog test?
Yes, P0359 will cause your vehicle to fail an emissions or smog test. Any active Check Engine Light, especially one related to a misfire, indicates a problem that prevents the vehicle from meeting emissions standards.
What's the difference between P0359 and P0309?
P0359 specifically indicates an electrical circuit malfunction with the ignition coil for cylinder 9. P0309 indicates a general misfire detected in cylinder 9. A P0359 code will almost always be accompanied by a P0309 code, as a coil circuit malfunction directly causes a misfire.
P0359 on Ford F-150?
On Ford F-150s, especially those with V8 engines, P0359 is a common code indicating a failed ignition coil for cylinder 9. These coils are known to fail over time. It's a straightforward replacement, but ensure you use a quality replacement coil.
Questions to Ask Your Mechanic
Did you swap the cylinder 9 ignition coil to another cylinder to confirm the coil itself is faulty?
Good answer: Yes, we swapped the coil to cylinder X, and the misfire code followed it, confirming the coil is bad. We've ordered a new one.
What did you find when checking the wiring and connector for the cylinder 9 ignition coil?
Good answer: We checked the wiring harness and connector for cylinder 9. All pins are clean, and we have proper voltage and ground signals, so the wiring is good.
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
0.5-1.5 hours
Intermediate - Requires basic hand tools and a methodical approach to diagnosis. Swapping coils is simple, but electrical testing requires a multimeter and some understanding.
Cost of Waiting
Continued driving with a P0359 code and a misfiring cylinder will send unburned fuel into your exhaust system. This rapidly overheats and damages your catalytic converter, turning a $50-$100 ignition coil job into a $800-$2,500 catalytic converter replacement.
While You're In There...
You're already accessing the ignition coil, which sits directly on top of the spark plug. It's smart to inspect and replace the spark plug at the same time, as a worn plug can stress the coil or be the root cause of the misfire.
Applying dielectric grease to the inside of the ignition coil boot and the spark plug ceramic helps prevent moisture intrusion, improves electrical connection, and makes future removal easier.
Tools You'll Need
- Socket wrench set
- Spark plug socket (if replacing plug)
- Extension bar
- Screwdriver set
- Multimeter (for advanced diagnostics)
- Dielectric grease
P0359 is a common ignition system code. Most repairs involve replacing a single ignition coil, which is a straightforward job for an intermediate DIYer. Your engine will run smoothly again once fixed.
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Your Next Steps
Step 1: Visually inspect the ignition coil and connector for cylinder 9. Look for any obvious damage or loose connections.
Step 2: Swap the ignition coil from cylinder 9 with a coil from a different cylinder. Clear the code and drive the vehicle. If the code moves to the new cylinder, replace the original cylinder 9 coil.
Step 3: If the code does not move, inspect the spark plug for cylinder 9. Replace if it's fouled or worn. If the problem persists, you may need to test the wiring to the coil or consult a professional for PCM diagnosis.