P0351 - Ignition Coil A Primary/Secondary Circuit

The ECM detected a primary or secondary circuit fault for ignition coil A.

Code Overview

The ECM detected a primary or secondary circuit fault for ignition coil A.

Common Causes

• Failed ignition coil
• Coil wiring issue
• Poor connector fit or terminal tension problem
• PCM driver issue (rare)

Diagnostic Steps

1. Swap the coil if the design allows and see whether the fault follows
2. Inspect the coil connector, pins, and boot for heat or carbon tracking
3. Check for companion misfire codes and verify power and ground at the coil

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.