Causes of the P0351 code
Defective spark plugs or damage to tied wires
Ignition coil defective
Defective ECM
Short circuit or open circuit in the ignition coil wire
Bad electrical connection
What repairs can fix the P0351 code?
Replacing spark plugs and related wires
Replacing the ignition coil
Repair or replace worn or damaged electrical wires
Repair or replace the damaged electrical connector
Replacing the engine control unit
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P0354
The P0354 code indicates that the vehicle PCM is not receiving the required signals from the ignition coil or coils while the vehicle is in use. This could indicate a problem with the primary or secondary winding of the coil.
To resolve the P0354 code, you may need to:
Eliminating intake manifold vacuum leakage
Repair or replace worn or damaged ignition coil wires (or coils)
Replacing one or more spark plugs
Repair or replacement of one or more ignition coils