P0350: Ignition Coil Primary/Secondary Circuit Malfunction
Can you still drive? Not recommended if misfires are present. Continued driving with misfires can damage the catalytic converter and reduce engine life.
What Does P0350 Mean?
Code P0350 is a general ignition coil circuit fault that indicates the ECM has detected a malfunction in one or more ignition coil circuits but cannot pinpoint which specific coil is affected. This may occur on systems where coils share circuits or on older waste-spark ignition systems.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Failed ignition coil pack
- Damaged coil wiring harness
- Faulty ignition module
- Poor coil pack connector
- ECM ignition driver failure
Symptoms
- Check engine light on
- Engine misfires
- Rough idle
- Reduced power
- Hard starting
Diagnostic Steps
- 1Check for companion cylinder-specific misfire codes
- 2Test each ignition coil resistance (primary and secondary)
- 3Inspect coil pack connector for corrosion or heat damage
- 4Test power and ground supply to ignition coils
- 5Swap coil pack with known good unit if available
Recommended Parts & Tools
ignition coil pack
spark plug wire set
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $50 - $400 |
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Chat with AI About P0350Commonly Affected Vehicles
Related Recalls
2 Active Recalls — 2026 Ford Ranger
The following NHTSA safety recalls have been issued for this vehicle. Contact your dealer to check if your vehicle is affected.
AIR BAGS:SIDE/WINDOW:CURTAIN
Ford Motor Company (Ford) is recalling certain 2024-2026 Ranger vehicles. The side curtain air bags may contact the B-Pillar inner reinforcements and tear during deployment. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 226, "Ejection Mitigation."
Remedy: Dealers will install protective shields, free of charge. Owner notification letters were mailed September 26, 2025. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 25C41.
ELECTRICAL SYSTEM: INTEGRATED TRAILER BRAKE CONTROL
Ford Motor Company (Ford) is recalling certain 2021-2026 F-150, 2022-2026 F-250 SD, F-350 SD, F-450 SD, F-550 SD, Maverick, 2024-2026 Ranger, 2023-2026 F-600 SD, 2022-2027 Lincoln Navigator, Expedition, and 2026 E-Transit vehicles. When towing a trailer, the integrated trailer module (ITRM) may lose communication with the vehicle, possibly causing a loss of brake and turn signal lights, or a loss of brake function. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, " Lamps, Reflective Devices, and Associated Equipment."
Remedy: The integrated trailer module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. Owner notification letters are expected to be mailed March 17, 2026. Owners may contact Ford customer service at 1-866-436-7332. Ford's number for this recall is 26C10. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning March 17, 2026.
Data provided by the National Highway Traffic Safety Administration (NHTSA).
Frequently Asked Questions
Why doesn't P0350 tell me which coil is bad?
P0350 is a general circuit code. Some ignition systems use shared coil packs where the ECM cannot isolate the fault to a single coil. Check for specific P035x codes.
Can I test ignition coils at home?
Yes, you can measure primary and secondary resistance with a multimeter. Compare readings to your vehicle's specifications to identify a failed coil.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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