P0351
High SeverityIgnition Coil A Primary/Secondary Circuit
Ignition System
P0351 — Instant Answer
Ignition Coil A Primary/Secondary Circuit
Severity: HIGH SEVERITY
Meaning: Coil on cylinder 1 has a circuit fault.
Safe to drive? NO if CEL is flashing. YES with caution if solid, but repair this week.
Estimated repair cost: $20 - $80
Most common causes:
- 1. Failed ignition coil (35-45% of cases)
- 2. Wiring issue (10-25% of cases)
- 3. ECM driver (5-10% of cases)
Symptoms
- ⚠️Cylinder 1 misfire
- ⚠️Rough idle
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0351
- 1Swap coil with another cylinder
- 2Check coil connector
- 3Measure coil resistance
OEM Procedures for P0351
P0351 affects the Ignition Coil. Found 34 OEM service manual procedures.
Ignition Coil
Ignition Coil & ICM Replacement (HVS) - Installation
Ignition Coil & ICM Replacement (HVS) - Installation
Ignition Coil & ICM Replacement (HVS) - Installation
Ignition Coil & ICM Replacement (HVS) - Installation
Ignition Coil & ICM Replacement (HVS) - Installation
Ignition Coil & ICM Replacement (HVS) - Installation
Ignition Coil & ICM Replacement (HVS) - Installation
Showing 8 of 34 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0351 Ignition Coil A Primary/Secondary Circuit.
Oxygen Sensor
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Spark Plugs
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Ignition Coils
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Mass Air Flow Sensor
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Fuel Injectors
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Engine Oil
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsReady to fix it yourself?
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0351.
OEM Manual Evidence
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Related Symptoms
Browse →Rough idle often traces back to ignition, air metering, vacuum leaks, or timing-related faults before it becomes a full misfire complaint.
A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.
Exact Vehicle Hubs
Browse →Open the exact vehicle hub for a repair workflow commonly associated with P0351.
Open the exact vehicle hub for a repair workflow commonly associated with P0351.
Open the exact vehicle hub for a repair workflow commonly associated with P0351.
Open the exact vehicle hub grounded by OEM manual evidence related to P0351.
Open the exact vehicle hub grounded by OEM manual evidence related to P0351.
Open the exact vehicle hub grounded by OEM manual evidence related to P0351.
Exact Repair Workflows
Browse →Open the exact repair flow most commonly associated with P0351 on this vehicle.
Open the exact repair flow most commonly associated with P0351 on this vehicle.
Open the exact repair flow most commonly associated with P0351 on this vehicle.
Open the exact repair flow most commonly associated with P0351 on this vehicle.
Open the exact repair flow most commonly associated with P0351 on this vehicle.
Open the exact repair flow most commonly associated with P0351 on this vehicle.
Related Codes
Cylinder 1 is misfiring — not firing properly. Could be spark plug, coil, injector, or compression issue on that specific cylinder.
Coil on cylinder 2 has a circuit fault.
The engine is misfiring across multiple cylinders. This is often caused by something that affects all cylinders — spark plugs, fuel quality, vacuum leak, or low compression.
Frequently Asked Questions
- How do I test an ignition coil?
- Swap it with another cylinder. If the misfire moves, the coil is bad.
- Can a bad spark plug kill a coil?
- Yes — a worn plug with too wide a gap forces the coil to work harder, shortening its life.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29