P0351 on Buick: Symptoms, Causes & Fix
Official technical diagnostic wire for fault code P0351 specifically affecting Buick vehicles (Enclave, Encore GX, Envision, Envista).
Select Your Buick Model for P0351:
1. Common Symptoms on Buick Vehicles
When Buick Engine Control Modules (ECM) trigger fault code P0351, drivers typically report:
2. Root Causes on Buick Engines
Historical diagnostic claims across Buick engines point to the following failure distribution:
3. Step-by-Step Fix Protocol for Buick
Identify Cylinder 1 ignition coil pack mounted on the valve cover. on Buick 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 Buick engines.
Check for 12V battery power, chassis ground, and 5V trigger pulse from the PCM on the 3-pin / 4-pin harness plug. on Buick engines.
Install a new OEM ignition coil (e.g. Denso, Motorcraft, Delphi) and replace the spark plug on Cylinder 1. on Buick engines.
Clear DTCs and verify smooth acceleration under load. on Buick engines.
Equipment for Diagnosing Buick (P0351)
Direct-Fit Laser Iridium Spark Plugs (Set of 4/6)
Pre-gapped iridium spark plugs engineered to restore smooth combustion on Buick.
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. Buick P0351 Frequently Asked Questions
What does code P0351 mean on a Buick?
On Buick 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 Buick 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 Buick powertrains, we recommend scanning live data values promptly to prevent secondary damage.
How much does it cost to fix code P0351 on a Buick?
Estimated DIY parts cost ranges from $100 - $350 (DIY: $30 - $90), while professional shop repairs at an authorized Buick dealership or independent specialist typically range from $180 to $380 including diagnostic labor.