P0351 on Honda: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0351 specifically affecting Honda vehicles (Civic, Accord, CR-V, Pilot, HR-V).
Select Your Honda Model for P0351:
1. Common Symptoms on Honda Vehicles
When Honda Engine Control Modules (ECM) trigger fault code P0351, drivers typically report:
2. Root Causes on Honda Engines
Historical diagnostic claims across Honda engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Honda
Identify Cylinder 1 ignition coil pack mounted on the valve cover. on Honda engines.
Swap Coil 1 with Coil 2. Clear codes and restart engine. If code switches to P0352 (Coil B), the ignition coil is 100% defective. on Honda engines.
Check for 12V battery power, chassis ground, and 5V trigger pulse from the PCM on the 3-pin / 4-pin harness plug. on Honda engines.
Install a new OEM ignition coil (e.g. Denso, Motorcraft, Delphi) and replace the spark plug on Cylinder 1. on Honda engines.
Clear DTCs and verify smooth acceleration under load. on Honda engines.
Equipment for Diagnosing Honda (P0351)
Direct-Fit Laser Iridium Spark Plugs (Set of 4/6)
Pre-gapped iridium spark plugs engineered to restore smooth combustion on Honda.
Magnetic Swivel Spark Plug Socket Set
360-degree magnetic swivel socket prevents ceramic plug cracks inside deep engine spark wells.
BlueDriver Bluetooth Pro OBDII Scan Tool
Reads and clears enhanced codes (ABS, Airbag, Transmission, Engine) & live freeze-frame telemetry on phone.
4. Honda P0351 Frequently Asked Questions
What does code P0351 mean on a Honda?
On Honda vehicles, P0351 indicates that the Engine Control Module (ECM) detected ignition coil a primary/secondary circuit malfunction. This typically points to Failed ignition coil pack on Cylinder 1 (Coil A) or Broken or melted wiring harness to ignition coil 1.
Can I continue driving my Honda with code P0351?
No. Cylinder 1 ignition coil has failed completely, causing an active misfire and dumping unburned fuel into the catalytic converter. Because this code carries a Critical severity rating on Honda powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0351 on a Honda?
Estimated DIY parts cost ranges from $100 - $350 (DIY: $30 - $90), while professional shop repairs at an authorized Honda dealership or independent specialist typically range from $180 to $380 including diagnostic labor.